GB1466465A - Ceramic coated structure and process for its preparation - Google Patents

Ceramic coated structure and process for its preparation

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Publication number
GB1466465A
GB1466465A GB1667774A GB1667774A GB1466465A GB 1466465 A GB1466465 A GB 1466465A GB 1667774 A GB1667774 A GB 1667774A GB 1667774 A GB1667774 A GB 1667774A GB 1466465 A GB1466465 A GB 1466465A
Authority
GB
United Kingdom
Prior art keywords
fibres
ceramic
yarn
weight
yarns
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.)
Expired
Application number
GB1667774A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to GB1667774A priority Critical patent/GB1466465A/en
Publication of GB1466465A publication Critical patent/GB1466465A/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01J35/58—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • 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
    • C04B35/10—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 aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/117—Composites
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    • 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
    • C04B35/62227—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres
    • C04B35/62231—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres based on oxide ceramics
    • C04B35/62236—Fibres based on aluminium oxide
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    • 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
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62625—Wet mixtures
    • C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • 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
    • C04B35/628—Coating the powders or the macroscopic reinforcing agents
    • C04B35/62802—Powder coating materials
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    • C04B35/62813—Alumina or aluminates
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    • 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
    • C04B35/632—Organic additives
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C04B35/82—Asbestos; Glass; Fused silica
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
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    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/5216—Inorganic
    • C04B2235/522—Oxidic
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    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
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    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6028—Shaping around a core which is removed later
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    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • F01N2330/101—Fibrous material, e.g. mineral or metallic wool using binders, e.g. to form a permeable mat, paper or the like
    • F01N2330/102—Fibrous material, e.g. mineral or metallic wool using binders, e.g. to form a permeable mat, paper or the like fibrous material being fiber reinforced polymer made of plastic matrix reinforced by fine glass or in the form of a loose mass of filaments or fibers

Abstract

1466465 Ceramic-coated fibrous structure, supported oxidation catalysts E I DU PONT DE NEMOURS & CO 16 April 1974 16677/74 Headings B1E and B2E [Also in Division D1] A fluid-permeable self-supporting refractory structure comprises a) an assembly of yarn arranged so that a plurality of well-defined apertures extend therethrough, the yarn comprising refractory oxide fibres containing at least 70% by weight Al 2 O 3 and constituting 20-75% by weight of the structure, b) 0-40% by weight of the structure of a fused, substantially non-porous binder having a softening point above 750‹C, the binder binding nearly abutting portions of the yarns, and c) 15-60% by weight of the structure of a ceramic coating having a melting point above 1000‹C and a porosity of 20-70% which at least partially surrounds the yarns but does not close the apertures. The yarn assembly may be formed from woven or knitted fibres or may be a random arrangement of bulked or textured yarns. When of high density, the assembly may be apertured by needling. It may particularly comprise a number of layers of spacedapart parallel rows of yarn, the yarns in different layers crossing to define square- or diamond-shaped apertures, and may be in the form of a tube comprising spaced helical convolutions of yarn. The fibres are usually substantially α-alumina and may be produced from refractory oxide precursor fibres, particularly fibres constituted by alumina together with basic aluminium salts. The binder (when present) may be applied in the form of a frit, dispersion or solution but is preferably also fibrous, comprising siliceous glass (particularly SiO 2 -Al 2 O 3 -MgO), borosilicate, aluminosilicate or crystalline ceramic fibres. The ceramic coating may comprise one or more oxides or oxide compounds (mullite, spinel) or precursors therefor (alumina hydrate, basic aluminium chloroacetate, aluminium chloride or magnesium acetate) and may especially contain at least 40% by weight Al 2 O 3 together with BaO, CaO, MgO, ZrO 2 or TiO 2 . Additional applications of the ceramic composition may be made after firing of the initially-coated assembly. The refractory structures, especially when in tube form, may be used as supports for catalysts. In Examples, a ceramic-coated reticulated tube having the above structure is soaked in platinum resinate solution and fired to provide a coating of platinum catalyst.
GB1667774A 1974-04-16 1974-04-16 Ceramic coated structure and process for its preparation Expired GB1466465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1667774A GB1466465A (en) 1974-04-16 1974-04-16 Ceramic coated structure and process for its preparation

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Application Number Priority Date Filing Date Title
GB1667774A GB1466465A (en) 1974-04-16 1974-04-16 Ceramic coated structure and process for its preparation

Publications (1)

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GB1466465A true GB1466465A (en) 1977-03-09

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GB1667774A Expired GB1466465A (en) 1974-04-16 1974-04-16 Ceramic coated structure and process for its preparation

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GB (1) GB1466465A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053884A1 (en) * 1980-11-27 1982-06-16 Johnson Matthey Public Limited Company Three dimensional interstitial catalyst supports, its manufacture and use
EP0061304A1 (en) * 1981-03-18 1982-09-29 Johnson Matthey Public Limited Company Three dimensional interstitial catalyst support, its manufacture and use
US7772147B2 (en) 2004-09-13 2010-08-10 Johnson Matthey Public Limited Company Catalyst carrier substrate coated with washcoat comprising fibrous material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053884A1 (en) * 1980-11-27 1982-06-16 Johnson Matthey Public Limited Company Three dimensional interstitial catalyst supports, its manufacture and use
US4464482A (en) * 1980-11-27 1984-08-07 Johnson Matthey Public Limited Company Three dimensional interstitial catalyst support and its manufacture
EP0061304A1 (en) * 1981-03-18 1982-09-29 Johnson Matthey Public Limited Company Three dimensional interstitial catalyst support, its manufacture and use
US7772147B2 (en) 2004-09-13 2010-08-10 Johnson Matthey Public Limited Company Catalyst carrier substrate coated with washcoat comprising fibrous material

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