EP2582644A1 - Catalytic filter for filtering a gas, comprising a joint cement incorporating a geopolymer material - Google Patents
Catalytic filter for filtering a gas, comprising a joint cement incorporating a geopolymer materialInfo
- Publication number
- EP2582644A1 EP2582644A1 EP11734165.1A EP11734165A EP2582644A1 EP 2582644 A1 EP2582644 A1 EP 2582644A1 EP 11734165 A EP11734165 A EP 11734165A EP 2582644 A1 EP2582644 A1 EP 2582644A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cement
- grains
- filter
- elements
- structure according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
- C04B37/003—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts
- C04B37/005—Joining burned ceramic articles with other burned ceramic articles or other articles by heating by means of an interlayer consisting of a combination of materials selected from glass, or ceramic material with metals, metal oxides or metal salts consisting of glass or ceramic material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/478—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on aluminium titanates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
- C04B35/6316—Binders based on silicon compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
- C04B38/0016—Honeycomb structures assembled from subunits
- C04B38/0019—Honeycomb structures assembled from subunits characterised by the material used for joining separate subunits
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5077—Geopolymer cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/04—Ceramic interlayers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Definitions
- the invention relates to the field of particulate filters especially used in an exhaust line of an engine for the removal of soot produced by the combustion of a diesel fuel in an internal combustion engine.
- Filtration structures for soot contained in the exhaust gas of an internal combustion engine are well known in the prior art. These structures most often comprise at least one honeycomb filtering element, one of the faces of the structure allowing the admission of the exhaust gases to be filtered and the other side the evacuation of the filtered exhaust gases.
- the term "monolith” or “monolithic element” denotes indifferently such filter elements.
- the structure comprises, between the intake and discharge faces, a set of adjacent ducts or channels of axes parallel to each other separated by porous filtration walls, which ducts are closed to one or the other of their ends for delimiting input chambers s 'opening according to the inlet face and outlet chambers s' opening according to the discharge face.
- the peripheral part of the structure is most often surrounded by a cement, called coating cement in the following description.
- the channels are alternately closed in an order such that the exhaust gases, during the crossing of the honeycomb body, are forced to pass through the sidewalls of the inlet channels to join the outlet channels. Of In this way, the particles or soot are deposited and accumulate on the porous walls of the filter body.
- the filter bodies are porous ceramic material, for example cordierite or silicon carbide or aluminum titanate.
- the particulate filter is subjected to a succession of filtration (soot accumulation) and regeneration (soot elimination) phases.
- filtration phases the soot particles emitted by the engine are retained and are deposited inside the filter.
- regeneration phases the soot particles are burnt inside the filter itself, in order to restore its filtration properties.
- the porous structure is then subjected to temperatures that can be locally above 1000 ° C. and undergoes, due to very strong internal temperature gradients, intense thermal and mechanical stresses. These constraints can lead to micro-cracks likely over time to cause a severe loss of filtration capacity of the unit, or even its complete deactivation. This phenomenon is particularly observed on monolithic SiC filters of large diameter.
- the composition of the initial cement must be adapted to allow obviously sufficient adhesion between the various monolithic elements but without it being too important, to be able to absorb most of the thermomechanical stresses applied to the structure during the successive phases of regeneration.
- a first assembly of the filter is first obtained from monolithic elements previously synthesized by means of a loose paste of the joint cement having the properties of rheology suitable for its application between the elements and their connection. After drying the cement at a temperature of the order of 100 ° C allowing its hardening, by removing the free water present in the cement, this first assembled structure is most often machined so as to adapt the shapes to its housing in the exhaust line. A coating cement of the same nature is then most often applied to the filter to cover the entire outer side surface, essentially to ensure sealing.
- the filter thus obtained must be able to be put directly into an automobile exhaust line, the remaining organic compounds, possibly in the cement, then being progressively burned in the exhaust line during the first regeneration cycles of the filter.
- the conventional method for obtaining an assembled structure may, however, lead to the weakening of said structure at certain points, because of the nature of the cement and especially its temperature behavior.
- the transformation of polluting emissions into the gas phase ie mainly nitrogen oxides (NO x ) or sulfur (SO x ) and carbon monoxide (CO), or even unburnt hydrocarbons
- less harmful gases such as nitrogen gas (N 2 ) or carbon dioxide (C0 2 )
- the honeycomb structure is impregnated with a solution comprising the catalyst or a precursor of the catalyst.
- Such methods generally include an immersion impregnation step in either a solution containing a catalyst precursor or a solubilized catalyst in water (or another polar solvent), or a suspension in water of catalytic particles.
- a process always requires the final maturation of the catalyst, by a final heat treatment operated at a temperature of about 500 ° C.
- the tests carried out by the applicant have also shown that in the case of such a filter incorporating such a catalytic component, the use of a conventional joint cement can cause serious problems of cohesion of the assembled filter, especially when it is put in place in its metal casing for the integration of the pollution control system within the exhaust line.
- the filter is inserted into force in the material insulating the outer metal casing of the exhaust line.
- the tests carried out by the applicant showed that the catalyst maturation temperature (approximately 500 ° C.) also corresponded to the minimum point of adhesion between the monolithic elements (see the examples given in the remainder of the description).
- the "canning” operation then results in the dismemberment of the elements of the assembled filter on which the thrust is carried out for its implementation, precisely because of the weak adhesion strength of the joint cement.
- the object of the present invention is to provide a solution to all the problems described above. More particularly, it is proposed according to the invention a filter assembled by means of a joint cement whose new composition makes it possible to answer effectively all the technical problems previously exposed.
- the structures assembled according to the present invention are characterized by a strong, constant and durable adhesion between the joint cement and the monolithic elements constituting said structures, as soon as they are assembled but also whatever the temperature level at which they are subsequently subjected, in particular between 300 and 800 ° C, as will be demonstrated in the following description.
- the present invention relates to a particulate-laden gas filtering structure comprising a plurality of honeycomb-type filtering elements, said filtering elements comprising a set of longitudinal adjacent channels of axes parallel to each other separated by porous filtering walls comprising or consisting of a material chosen especially from silicon carbide SiC for example obtained by recrystallization, Si-SiC, silicon nitride, aluminum titanate, Mullite or Cordierite, in particular SiC or Mullite, or a mixture of these materials, said channels being alternately plugged at one or the other ends of the elements so as to define inlet channels and outlet channels for the gas to be filtered, and in order to force said gas to pass through the porous walls separating the inlet and outlet channels, said structure being obtained by the assembly ts elements, joined to each other by means of a joint cement, said joint cement being an essentially inorganic, preferably mineral composite material comprising at least:
- binder matrix incorporating a geopolymer phase
- said binder matrix comprising, as a weight percentage of the corresponding oxides:
- Si0 2 between 20 and 80%
- A1 2 0 3 between 3 and 50%
- 3 ⁇ 4'0 between 3 and 30%,] 3 ⁇ 4'0 representing the sum of the alkali oxides present in the binder matrix.
- charge is meant a set of grains present within the cement to ensure the essential properties of mechanical strength and refractoriness.
- diameter of a grain or equivalent diameter of a constituent grain of the joint cement the average between its largest dimension and its smallest dimension, these dimensions being for example measured on a section of the seal conventionally by observation with a scanning microscope.
- this average diameter is between 50 and 500 microns, and particularly preferably between 100 and 200 microns.
- the term "grain” means particles of the same inorganic material, said particles being capable of being solid grains throughout their entirety. mass or in particular of solid or porous and / or hollow spheres.
- Sphere means a particle having a sphericity, that is to say a ratio between its smallest diameter and its largest diameter, greater than or equal to 0.75, regardless of the manner in which this sphericity was obtained.
- the spheres used according to the invention preferably have a sphericity greater than or equal to 0.8, preferably greater than or equal to 0.9.
- a particle and in particular a sphere is said to be porous when its porosity is greater than 50% by volume.
- a sphere is called “hollow” when it has a central cavity, closed or open on the outside, the volume of which represents at least 50% of the overall external volume of the hollow spherical particle.
- the thickness of the wall is less than 30% of the average particle diameter, preferably less than 10% of said diameter, or even less than 5%.
- Silicon nitride is understood to mean a material of the family in the general sense of SiAlON, comprising in particular S1 3 4 in ⁇ or ⁇ crystallized form, but also Si20N2, or even other phases of the SiAlON ⁇ 'family, X, O 'in particular.
- Si-SiC is meant a material consisting of a mixture of metallic silicon and silicon carbide, preferably in the presence of a phase optionally crystallized or not or partially and composed of silicate and / or by other oxides in order to protect the metallic silicon of oxidation.
- At least a portion of the grains according to the invention may be in the form of inorganic fibers, that is to say elongated structure typically of diameter 0.1 to 2 micrometers and lengths up to about 1000 micrometers.
- binder matrix is understood to mean a composition that is entirely crystallized or not, incorporating a geopolymer phase, and establishing a three-dimensional structure between the grains of the filler.
- the matrix can substantially surround the grains, that is to say, to coat them at least partially to ensure a link between them.
- the binder matrix may consist of or essentially comprise the geopolymer phase.
- the binder matrix may comprise a geopolymer phase and inclusions within said phase, that is to say particles of diameters substantially less than 30 microns.
- sialate group Si-O-Al-O-
- crosslinking agent according to the following scheme:
- the geopolymers of the matrix are obtained at ambient temperature or preferably at temperatures of the order of 40 to 100 ° C., in particular between 60 and 90 ° C., at atmospheric pressure by activating a mixture containing silicon and aluminum by alkali metals (so-called geosynthesis reaction).
- a geopolymer according to the present invention can be formed by polymerization and solidification of a mixture comprising an aluminosilicate and an alkali metal silicate, in alkaline medium, in particular KOH or NaOH.
- the aluminosilicate used in the present invention can be in particular a metakaolin, bentonite, andalusite or other natural mineral or an alumino ⁇ synthetic silicate as a function of the mass ratio of the elements silicon / alumina, which is preferably between 1 and 5, more preferably between 1 and 3, and most preferably about 2.
- the alkali metal silicate is preferably an Na and / or K silicate.
- the molar ratio SiO 2 / (Na 2 O + K 2 O) is preferably between 1 and 3, preferably between 1, 8 and 2.5.
- the mineral filler is formed of a set of refractory grains whose average diameter is between 50 micrometers and 500 micrometers,
- the bonding matrix of the joint cement further comprises between 5 and 30% by weight, preferably between 10 and 20% by weight, inclusions formed by grains having a diameter greater than or equal to 1 micron and less than or equal to 30 micrometers .
- composition of the binder matrix corresponds to the following formulation, as a percentage by weight of the oxides:
- AI2O3 between 5 and 40%
- the binder matrix has a mass ratio S1O 2 / Al 2 O 3 and a mass ratio S1O 2 / (Na 2 ⁇ 0 + K 2 O) less than 6, preferably less than 5, and preferably greater than 3.5 even more preferably greater than 4.0.
- the binder matrix represents, by weight, between 10 and 60%, preferably between 25 and 55%, of the mineral material constituting the joint cement, excluding water and any organic additions,
- the grains constituting the charge represent between 40 and 80%, by mass, of the mineral material constituting the joint cement, excluding water and any organic additions,
- the grains constituting the filler comprise or consist of a material chosen from alumina, in particular in corundum form, zirconia, silica, titanium oxide, magnesia, aluminum titanate, mullite, cordierite, aluminum titanate, silicon carbide, carbon in particular in graphite form, or their mixture,
- the grains constituting the filler comprise or consist of porous and / or hollow inorganic spheres, preferably comprising predominantly silica and / or alumina.
- the lateral surface of the filter is covered with a peripheral coating consisting of or comprising an essentially inorganic composite material, preferably mineral, comprising at least:
- a mineral filler formed of refractory grains whose melting point is greater than 1000 ° C. and whose grains have a diameter greater than 30 microns,
- binder matrix incorporating a geopolymer phase, said binder matrix comprising, as a percentage by weight of the corresponding oxides:
- Si0 2 between 20 and 80%
- A1 2 0 3 between 3 and 50%
- R 2 '0 between 3 and 30%
- R 2 '0 representing an oxide of an alkali or the sum of the alkali oxides in the binder phase.
- the lateral surface of the filter is covered with a peripheral coating of the same composition as the joint cement,
- the filtering structure further comprises a supported or preferably unsupported active catalyst phase, typically comprising at least one precious metal such as Pt and / or Rh and / or Pd and optionally an oxide such as Ce0 2 , Zr0 2 , Ce0 2 - Zr0 2 .
- a supported or preferably unsupported active catalyst phase typically comprising at least one precious metal such as Pt and / or Rh and / or Pd and optionally an oxide such as Ce0 2 , Zr0 2 , Ce0 2 - Zr0 2 .
- the present invention also relates to an exhaust line comprising a filtering structure as previously described.
- the present invention relates to a method of manufacturing a filter as described above, comprising the following steps:
- a mineral filler consisting of a set of grains whose melting temperature is greater than 1000 ° C. and of diameter greater than 30 micrometers
- an alumina-based compound preferably a natural or synthetic aluminosilicate, especially a clay, and optionally organic cement-forming additives, especially organic binders, plasticizers, lubricants, dispersants or deflocculants, an aqueous solvent, in particular water,
- the seal material according to the invention covers only a part, between 10% and 90%, of the total surface area between the monolithic elements in the assembly.
- the seal between two monoliths or filter elements is thus interrupted.
- spacers may be arranged to ensure a determined spacing between the two filter elements.
- the fresh cement is applied in a discontinuous manner to form a plurality of joint portions locally adapted to optimize the attenuation constraints ⁇ thermo mechanical likely to be generated.
- the thickness of the joint between two monolithic elements is typically between 0.5 mm and 2 mm and in particular is about 1.5 mm ( ⁇ 0.5 mm).
- At least two joint portions comprise materials differing in composition and / or structure and / or thickness; the cements of said joint portions have moduli of elasticity, in particular Young's moduli differing by a value greater than or equal to 10%;
- At least one of said seal portions has anisotropic elasticity properties
- said joint portion comprises a silica fabric impregnated with a cement
- the thicknesses of at least two of said joint portions differ in a ratio of at least two;
- At least one of said joint portions comprises a slot
- said slot opens on one of the upstream or downstream faces of said body
- slot is formed in a plane substantially parallel to the faces of said monoliths or filter elements assembled by said joint portion ("seal faces");
- the length or depth of said slot is between 0.1 and 0.9 times the total length of said body
- said slot is substantially adjacent to one side of one of said monoliths
- said slot is filled, at least in part, with a filling material which adheres neither to said block nor to the cement of said joint portion in which it is formed;
- said filler material is boron nitride or silica.
- FR 2 833 857 describes in particular a method for manufacturing such joints.
- Figure 1 shows a schematic view of the upstream face of an assembled filter according to the present invention.
- Figure 2 is a sectional view along the axis XX 'of the filter of Figure 1, placed in a metal casing.
- Figures 1 and 2 describe an assembled filter 1 according to the invention.
- the filter is obtained by assembling unitary monolithic elements 2 using a joint cement 10.
- the monolithic elements 2 are themselves obtained by extrusion of a loose paste, for example carbide silicon, cordierite or aluminum titanate, to form a porous honeycomb structure.
- porous structures are extruded as monolithic elements.
- Each of the monolithic elements 2 has the shape of a rectangular parallelepiped extending along a longitudinal axis between two upstream faces 3 and 4 downstream substantially square on which opens a plurality of adjacent channels, rectilinear and parallel to the longitudinal axis.
- extruded porous structures are alternately plugged on their upstream face 3 or on their downstream face 4 by upstream and downstream plugs 5, to form respectively outlet channels 6 and inlet channels 7.
- Each channel 6 or 7 thus defines an interior volume delimited by side walls 8, a closure cap 5 disposed either on the upstream face or on the downstream face and an opening opening alternately towards the downstream face or the upstream face, such that the inlet and outlet channels are in fluid communication by the side walls 8.
- the monolithic elements are assembled together by gluing by means of the joint cement 10 according to the invention and as previously described, that is to say comprising a mixture of a filler consisting of bonded refractory grains. by a matrix constituted by or incorporating a phase of the geopolymer type.
- a filtering structure or assembled filter is obtained as shown diagrammatically in FIGS. 1 and 2.
- the assembly thus formed can then be machined to take, for example, a round or ovoid section, then possibly covered with a cement coating material and / or an insulation material 12, such as glass wool or rockwool. This results in an assembled filter adapted to be inserted into an exhaust line 11, according to well-known techniques.
- the flow of the exhaust gases comprising the particles to be filtered enters the filter 1 through the inlet channels 7, then passes through the filtering side walls 8 of these channels to join the outlet channels 6.
- the propagation of the gases in the filter is illustrated in Figure 2 by arrows 9.
- median diameter or dso means the size dividing the particles of this mixture or the grains of this mixture into a first population and a second population equal in mass, these first and second populations comprising only particles or grains presenting a size greater or smaller respectively than this median diameter.
- a porogen of the polyethylene type in a proportion equal to 5% by weight of the total weight of the SiC grains and a methylcellulose-type shaping additive in a proportion equal to 10% by weight of the total weight of the SiC grains.
- the quantity of water required is then added and kneaded to obtain a homogeneous paste whose plasticity allows extrusion through a die configured to obtain monoliths of square section and whose internal channels have, in a section cross-section, a corrugation of the walls characterized by an asymmetry rate equal to 7%, in the sense described in the application WO 05/016491.
- the structure has a periodicity, ie a half-period p (distance between 2 adjacent channels), equal to 1.95mm.
- the green monoliths obtained are dried by microwave for a time sufficient to bring the water content not chemically bound to less than 1 ⁇ 6 by mass.
- the channels of each face of the monolith are alternately blocked according to well-known techniques, for example described in application WO 2004/065088.
- the monoliths are then fired in argon according to a rise in temperature of 20 ° C / hour until a maximum temperature of 2200 ° C is reached which is maintained for 6 hours.
- the porous material obtained has an open porosity of 47% and a median pore diameter of the order of 15 microns, as measured by mercury porosimetry.
- Zircon powders are supplied by the Counter of Minerals and Raw Materials (CMMP) under the reference BRIOREF Primazir 117CM and 325CM.
- the compound FZM is a fused Zirconia Mullite powder (FZM) marketed by Treibacher.
- the hollow microspheres are marketed by Oméga Minerais under the references W300 and W100.
- porous silica particles of the Perlite type marketed by the counter of minerals and raw materials (CMMP) under the reference SilCell 42BC.
- Argical M1000 reactive powder is a Metakaolin powder supplied by AGS Minerals.
- the Kerphalite KF5 reactive powder is an Andalucite powder supplied by Damrec.
- Na Silicate used is supplied by the company PQ corp. under the reference Crystal 0112. It is an aqueous solution which represents about 50 ⁇ 6 by mass of dry extract of a 2 Si0 4 .
- the preparation of the cement mixtures comprising the refractory grains and the precursors of the geopolymer (in the form of metakaolin and a natural aluminosilicate) is carried out for all the examples according to the same protocol:
- the mixing precursors according to a conventional procedure comprising:
- the viscosity measured on the initial cements compositions thus obtained is between 5 and 20 mPa.s -1 and preferably between 10 Pa and 13 mPa.s -1 , for a shear rate of 12 s - 1 as measured by the Haake VT550 viscometer.
- Three filter elements 20, 21 and 22 parallelepiped of 35.8mm ⁇ 35.8mm ⁇ 75mm previously obtained were successively assembled, in one direction, with the prepared cement compositions, according to the diagram given in FIG. constant joint cement thickness, wedges or "spacers" of 1 mm thickness were arranged between the joint faces of the filter elements to be assembled.
- the cement compositions of the joints 10 of the filter elements 20-22 thus assembled have undergone a geopolymerization treatment by placing these assemblies in an oven under air at 80 ° C. for 2 hours.
- Such heat treatment is representative of the operating conditions of a filter in an exhaust line.
- the adhesion strength of the joint cement was measured after each heat treatment according to the following adhesion test: the assembly was placed in such a way that the two peripheral filter elements were supported by rubber supports 30 and 31 approximately 30mm and about 5mm thick resting on lower supports 32 and 33 of diameter 10mm, the distance between the centers of these lower fixed supports being 75 mm.
- the central filter block 20 was subjected to the pressure of a movable upper punch 34 of diameter 10 mm moving up and down at a speed of 0.5 mm / min by pressing the metal plate 35 of 30 mm on the side and thickness 2mm. The force to which the central filter block 20 is detached from the assembly formed by rupture within the joint, was measured.
- Example 2 of Patent FR2902424 (Comparative Example 1 shown in Table 4 and on FIG. Figure 4).
- Another comparative example has also been realized in adding, in the cement preparation according to Example 2 of FR2902424, 18% by weight of a colloidal solution containing 30% silica solids Si0 2 , as well as 27% additional water, in order to obtain a constant water addition and a similar rheology.
- This comparative example 2 is also reported in Table 4 and in FIG.
- the percentage of geopolymer phase was calculated by summing the contributions, in percentages by weight of the dry extract, provided by sodium silicate, kerphalite KF5 and argium MlOOO, as initially given in table 2 for each mixture mineral.
- mineral mixture is understood to mean the mixture composed of mineral powders, that is to say except for additions of water including water from sodium silicate and excluding organic additives.
- the mass percentage of the filler was calculated by summing the contributions, in percentages by weight of grains of diameter greater than 30 microns provided by each powder of the mineral mixture except the sodium silicate, the KF5 kerphalite and the MlOOO argillum participating in the phase. geopolymer.
- the mass percentage of the inclusions was calculated by adding the contributions, in percentages by weight of grains of diameter less than or equal to 30 microns, provided by each powder of the mineral mixture except the sodium silicate, the kerphalite KF5 and the argium MlOOO participating in the geopolymer phase.
- the mass percentage of grains of diameter less than or equal to 30 microns and greater than 30 microns for each Mineral powder was determined by laser granulometer analysis.
- a microprobe or wavelength spectrometer (WDS) analysis on a section of cementitious material according to Examples 8 and 10 made it possible to perform an elementary point analysis on each part: charge, inclusion and geopolymer phase.
- Figure 4 shows the evolution of the adhesion strength of the cements (measured by the breaking stress in MPa). depending on the heating temperature applied to the cement. It is immediately apparent that the cements according to Comparative Examples 1 and 2 exhibit an extremely low level of adhesion to monoliths after heating to 500 ° C and the removal of organic binders.
- colloidal silica (comparative example 2) makes it possible to improve the adhesion, but at levels that are still too insufficient to prevent suddenly the dismemberment of some of the assemblies made.
- the filters assembled by a joint cement incorporating a filler and a geopolymeric matrix according to Examples 10, 7 and 8 demonstrate an improved and sufficient cohesion of the filtering elements between them to guarantee finally a strong integrity of the assembly, which whatever the temperature at which it is worn.
- the charge of the cement composition according to Example 10, of which an SEM photograph is given in the attached FIG. 5, consists of a mixture of zircon grains (solid: solid) and hollow microspheres made up of a mixture of alumina and silica, whose average diameter is greater than 50 micrometers.
- the cement composition according to Example 10 has ideal physical properties for the intended use, especially in terms of primary cement adhesion. A very good adhesion allows the constitution of an extremely resistant assembly from lower temperatures and even at ambient (25 ° C), as it is visible in the graph of Figure 4. It should be noted that the value of the initial force, at 25 ° C, shown in Figure 4 corresponds to time at break of the central monolithic element and not at a limit of cement adhesion to said elements. Such a property allows the manipulation and setting up of the filter in the safe line.
- the adhesion properties between the joint cement and the monoliths are temperature-stable: the high initial adhesion level remains extremely stable in temperature and at very low values. high, which guarantee the integrity of the assembled structure not only in the early phases of synthesis and implementation of the assembled structure, but also throughout its use in an automobile exhaust system. Such properties imply extended lifetimes of the filters according to the invention.
- the cement composition according to Example 7 differs from that of Example 10 in that the charge is this time composed exclusively of zircon grains, no hollow sphere having been used in the initial composition.
- the adhesion obtained is very comparable to that of Example 10 but the density is higher this time, which can be a problem if reduced weight filters are sought but be advantageous if one seeks catalysed filters having a time of light down higher.
- the time of light down is in the art the defusing time of the catalyst due to the cooling of the exhaust line, for example following a stop.
- the cement composition according to Example 9 also has physical properties similar to that of the cement composition according to Example 10, the difference between the compositions of the two cements residing mainly in the amount of fine particles (inclusions) less important in cement, that is to say grains whose diameter is between 1 and 30 microns. It has been observed by the applicant that this finest grain population ultimately ended up in the form of inclusions in the binder matrix incorporating the geopolymer material.
- the cement composition according to Example 8 is characterized by the absence of such inclusions (fine fraction of particles) in the matrix, the whole of the population of grains present in the cement, of size greater than 30 microns, constituting only the load of cement within the meaning of the present invention.
- the level of adhesion is then substantially lower, although much higher than those of the usual joint cements, illustrated by Comparative Examples 1 and 2, as shown in Table 4 and Figure 4.
- a level of adhesion of the composition of Example 8 stable and sufficient in temperature to maintain the cohesion of the assembly, especially at temperatures close to 500 ° C, temperatures for which the adhesion levels of the usual cements are however unacceptable.
- the cement compositions according to Examples 5 and 6 are characterized by a proportion of binding phase of the geopolymer type which is lower in mass percentage, that is to say of the order of 20% of the total mass of the dry cement, for a rate of of fine particles in inclusion of the order of 10 to 15%, values close to the proportion of inclusions of Examples 9 and 10 to allow a direct comparison.
- the adhesion properties are still extremely satisfactory from assembly at room temperature and regardless of the temperature at which the assembled filter is subsequently subjected.
- the composition of the matrix was varied so as to generate different ratios Si0 2 / Al 2 O 3 and SiO 2 / (Na 2 O + K 2 O), in accordance with various preferred embodiments of the present invention.
- Example 11 also shows that it is possible to obtain a cement having acceptable adhesion properties, although substantially lower than those of Examples 4 to 7 and 9 and 10, by using a relatively high percentage by weight of grains constituting load.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Catalysts (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1054729A FR2961113B1 (en) | 2010-06-15 | 2010-06-15 | CATALYTIC FILTER FOR THE FILTRATION OF A GAS COMPRISING A JOINT CEMENT INCORPORATING A GEOPOLYMER MATERIAL |
PCT/FR2011/051342 WO2011157939A1 (en) | 2010-06-15 | 2011-06-14 | Catalytic filter for filtering a gas, comprising a joint cement incorporating a geopolymer material |
Publications (1)
Publication Number | Publication Date |
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EP2582644A1 true EP2582644A1 (en) | 2013-04-24 |
Family
ID=43385133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11734165.1A Withdrawn EP2582644A1 (en) | 2010-06-15 | 2011-06-14 | Catalytic filter for filtering a gas, comprising a joint cement incorporating a geopolymer material |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130129574A1 (en) |
EP (1) | EP2582644A1 (en) |
JP (1) | JP2013538104A (en) |
CN (1) | CN103068768A (en) |
FR (1) | FR2961113B1 (en) |
WO (1) | WO2011157939A1 (en) |
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US11602728B2 (en) * | 2019-03-01 | 2023-03-14 | NOVOREACH Technologies LLC | Composite adsorbents and method of making them |
CN112661231A (en) * | 2020-12-16 | 2021-04-16 | 重庆大学 | Multifunctional long-acting composite filler and preparation method thereof |
CN113831152B (en) * | 2021-10-26 | 2022-08-02 | 纳思同(无锡)科技发展有限公司 | All-solid-waste high-strength permeable geopolymer concrete and preparation method thereof |
CN117567176A (en) * | 2023-12-04 | 2024-02-20 | 水利部交通运输部国家能源局南京水利科学研究院 | Hydraulic concrete low-temperature melting wear-resistant repair protective layer and construction method thereof |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2731697A1 (en) * | 1995-03-15 | 1996-09-20 | Michel Davidovics | ALUMINO-SILICATE ALKALINE GEOPOLYMERIC MATRIX, FOR COMPOSITE MATERIALS WITH FIBER REINFORCEMENTS, AND PROCESS FOR OBTAINING |
DK1270202T3 (en) | 1996-01-12 | 2006-08-07 | Ibiden Co Ltd | Exhaust gas purification filter |
DE60042036D1 (en) * | 1999-09-29 | 2009-05-28 | Ibiden Co Ltd | Honeycomb filter element and arrangement with ceramic filters |
FR2833857B1 (en) | 2001-12-20 | 2004-10-15 | Saint Gobain Ct Recherches | FILTER BODY COMPRISING A PLURALITY OF FILTER BLOCKS, IN PARTICULAR FOR A PARTICLE FILTER |
JP4723173B2 (en) | 2003-01-20 | 2011-07-13 | 日本碍子株式会社 | Manufacturing method of honeycomb structure |
FR2853256B1 (en) | 2003-04-01 | 2005-10-21 | Saint Gobain Ct Recherches | FILTRATION STRUCTURE, PARTICULARLY PARTICLE FILTER FOR THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE. |
FR2857696B1 (en) | 2003-07-18 | 2005-10-21 | Saint Gobain Ct Recherches | FILTER BLOCK FOR FILTRATION OF PARTICLES CONTAINED IN THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE. |
JP4331575B2 (en) * | 2003-11-26 | 2009-09-16 | 日本碍子株式会社 | Honeycomb structure, manufacturing method thereof, and bonding material |
US7745363B2 (en) * | 2005-05-09 | 2010-06-29 | Corning Incorporated | Geopolymer composites and structures formed therefrom |
FR2902424B1 (en) | 2006-06-19 | 2008-10-17 | Saint Gobain Ct Recherches | HOLLOW SPHERES JOINTING CEMENT FOR PARTICLE FILTER. |
US9828298B2 (en) * | 2007-11-30 | 2017-11-28 | Corning Incorporated | Cement compositions for applying to honeycomb bodies |
FR2937971B1 (en) * | 2008-10-30 | 2011-08-26 | Saint Gobain Ct Recherches | BODY ASSEMBLED WITH MACROPOROUS CURED CEMENT |
-
2010
- 2010-06-15 FR FR1054729A patent/FR2961113B1/en not_active Expired - Fee Related
-
2011
- 2011-06-14 US US13/700,840 patent/US20130129574A1/en not_active Abandoned
- 2011-06-14 EP EP11734165.1A patent/EP2582644A1/en not_active Withdrawn
- 2011-06-14 WO PCT/FR2011/051342 patent/WO2011157939A1/en active Application Filing
- 2011-06-14 JP JP2013514762A patent/JP2013538104A/en active Pending
- 2011-06-14 CN CN2011800294762A patent/CN103068768A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2011157939A1 * |
Also Published As
Publication number | Publication date |
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JP2013538104A (en) | 2013-10-10 |
CN103068768A (en) | 2013-04-24 |
FR2961113B1 (en) | 2012-06-08 |
US20130129574A1 (en) | 2013-05-23 |
FR2961113A1 (en) | 2011-12-16 |
WO2011157939A1 (en) | 2011-12-22 |
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