CN109304173A - Nano silver catalyst for catalytic combustion, preparation method and applications - Google Patents
Nano silver catalyst for catalytic combustion, preparation method and applications Download PDFInfo
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- CN109304173A CN109304173A CN201711133446.1A CN201711133446A CN109304173A CN 109304173 A CN109304173 A CN 109304173A CN 201711133446 A CN201711133446 A CN 201711133446A CN 109304173 A CN109304173 A CN 109304173A
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- catalyst
- nano silver
- catalytic combustion
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- silver catalyst
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- 239000003054 catalyst Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000007084 catalytic combustion reaction Methods 0.000 title claims abstract description 21
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 23
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 23
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 17
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 13
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 239000001294 propane Substances 0.000 claims abstract description 9
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 4
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000002808 molecular sieve Substances 0.000 claims abstract description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000010457 zeolite Substances 0.000 claims abstract description 3
- 239000012298 atmosphere Substances 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 7
- 238000007598 dipping method Methods 0.000 claims description 7
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000012266 salt solution Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 2
- 239000011247 coating layer Substances 0.000 claims 1
- 238000002386 leaching Methods 0.000 claims 1
- 238000009938 salting Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 18
- 239000000919 ceramic Substances 0.000 abstract description 9
- 238000006555 catalytic reaction Methods 0.000 abstract description 7
- 239000010970 precious metal Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 239000010953 base metal Substances 0.000 abstract 1
- 241000264877 Hippospongia communis Species 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(I) nitrate Inorganic materials [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005470 impregnation Methods 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 5
- 229910021641 deionized water Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 229910003158 γ-Al2O3 Inorganic materials 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002803 maceration Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
- B01J23/68—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/688—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with manganese, technetium or rhenium
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/50—Silver
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/20—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state
- B01J35/23—Catalysts, in general, characterised by their form or physical properties characterised by their non-solid state in a colloidal state
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/396—Distribution of the active metal ingredient
- B01J35/399—Distribution of the active metal ingredient homogeneously throughout the support particle
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
- B01J37/0201—Impregnation
-
- 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
- B01J37/0215—Coating
-
- 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
- B01J37/08—Heat treatment
-
- 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
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/088—Decomposition of a metal salt
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of nano silver catalyst for catalytic combustion, preparation method and applications, catalysis burning purifying industrial waste gases technical fields.It is using honeycomb-like cordierite as matrix, it is using noble metal as one of catalyst activity component, Ce, Zr or Mn or a variety of as modified component, Al2O3、SiO2、TiO2, one of zeolite molecular sieve be used as carrier.The coat for the catalyst being prepared is the modified carrier loaded precious metals ag of Ce, Zr and Mn, and catalyst layer is on cordierite ceramic matrix.The addition of base metal (Ce, Zr and Mn) significantly improves the activity and stability of precious metals ag catalyst, that is, the cost of catalyst is effectively reduced.Catalyst of the invention is suitable for operating under exhaust gas under low concentration and big air speed, has many advantages, such as low cost, high activity and high stability, can be widely used for the processing of exhaust gas, especially suitable in the application administered in propane exhaust gas.
Description
Technical field
The present invention relates to catalysis burning purifying industrial waste gases technical fields, and in particular to a kind of for administering propane exhaust gas
Nano silver catalyst for catalytic combustion and preparation method thereof.
Background technique
In recent years, as process of industrialization is accelerated, the organic exhaust gas discharge amounts of the industries such as oil movement and storage and fine chemistry industry by
It is cumulative to add, such as without processing direct emission, very big threat can be constituted to environment and human health.And at present due to being produced
The limitation of technical level, many production of hydrocarbons and oil movement and storage industry in process of production still inevitably to environmental emission or
The organic exhaust gas of various various concentrations is revealed, effective control is not yet received in the pollution of organic exhaust gas, and pollutes disastrous effect and get worse.
Catalysis burning is to eliminate one of volatile organic matter (VOCs) most efficient method, i.e., will give up under the action of catalyst
Flameless combustion is converted into harmless carbon dioxide and water to harmful hydrocarbon substance in gas at a lower temperature.The method has ignition
Temperature is low, saves the energy, and applied widely, treatment effeciency is high, without secondary pollution, increasingly by the attention of environment protection field.
At present using Production by Catalytic Combustion Process processing VOCs prior art existing research report, as CN1092697A discloses one kind
The preparation method of exhaust gas purifying catalyst: first by as the noble metal of catalysis material such as Pd and Pt, or in conjunction with the noble metal
Perovskite composite oxide, mix or be fixed on γ-Al2O3On base coating material, γ-Al2O3With about 150m2/ g's
Specific surface area.Resulting mixture carries out primary and mills, and obtains a kind of about 10-15 μm of average diameter range of washcoat layer slurry
Material.Then washcoat layer slurry is coated on carrier.CN102872920A discloses a kind of catalytic burning organic waste gas catalysis
The preparation method of agent carries out ultrasonic pretreatment to ceramic honey comb matrix first, then ceramic honey comb matrix after the pre-treatment
Load carriers coating, drying and roasting finally impregnate active metal component maceration extract on the basis of carrier coating, through dry and
Catalyst is made in roasting.
It is all using noble metal catalyst, because with higher in method for preparing catalyst disclosed in the above-mentioned prior art
Activity, selectivity, however its preparation cost is high, and activity, stability are to be improved.
Summary of the invention
The purpose of the present invention is to provide a kind of nano silver catalyst for catalytic combustion, preparation method and applications, by with
Honeycomb-like cordierite is matrix, and noble metal is one of active component and Ce, Zr or Mn or a variety of carriers as modification, system
Standby obtained catalyst activity is high, stability is good, and significantly reduces cost.
One of task of the invention is to provide a kind of nano silver catalyst for catalytic combustion.
A kind of nano silver catalyst for catalytic combustion, required raw material includes following components:
Using honeycomb-like cordierite as matrix；
Using noble metal as catalyst activity component；
Using one of Ce, Zr or Mn or a variety of as modified component；
With Al2O3、SiO2、TiO2, one of zeolite molecular sieve be used as carrier；
Wherein, by mass percentage, the noble metal accounts for the 0.01%~20.0% of catalyst quality, and described modified group
Divide and accounts for the 0.1%~30% of catalyst quality.
As a preferred solution of the present invention, the noble metal is selected from Pt, Ag, Pd, Ru, Rh and Ir.
As another preferred embodiment of the invention, the noble metal is selected from Ag.
Another task of the invention is to provide the preparation method of above-mentioned nano silver catalyst for catalytic combustion, including following step
It is rapid:
Carrier is placed in the aqueous solution of modified component and impregnated, heated, roasted and to obtain modified carrier；Change described
Property after carrier be placed in the water-soluble salt solution of active component and impregnate, is dry, roasting to obtain coat；The coat is made
Honeycomb-like cordierite is immersed by slurries, and coated, drying roasts obtained catalyst.
Preferably, the carrier impregnation is in the aqueous solution of isometric modified component, and dipping 2~for 24 hours.
It further, is 110 DEG C of dry 10h, air in temperature after the carrier impregnates in the aqueous solution of modified component
In 300~800 DEG C of 2~12h of roasting in atmosphere.
Further, modified carrier is placed in the water-soluble salt solution of isometric active component dipping 2~for 24 hours,
It is 110 DEG C of dry 10h in temperature, in 300~800 DEG C of 2~12h of roasting in air atmosphere.
Further, add 1~6h of water for ball milling that slurries are made the coat, honeycomb-like cordierite is immersed, pass through
It coats, be placed in Muffle furnace air atmosphere in 300~800 DEG C of 2~12h of roasting.
Further, the water-soluble salt solution is selected from nitrate solution.
Another task of the invention is to provide the application of above-mentioned catalyst.
Above-mentioned nano silver catalyst for catalytic combustion is in the application administered in propane exhaust gas.
Compared with prior art, the present invention improves precious metal catalyst by the carrier modified with Ce, Zr and Mn significantly
The low-temperature catalytic activity and stability of agent.The addition of Ce, Zr and Mn significantly improve the activity and stabilization of precious metals ag catalyst
Property, that is, the cost of catalyst is effectively reduced.Catalyst of the invention is suitable for operating under exhaust gas under low concentration and big air speed, has
Low cost, high activity and high stability can be widely used for the processing of exhaust gas.
Catalyst preparation process of the present invention is simple, with short production cycle, strong with the binding force of cordierite honeycomb ceramic matrix, expensive
Metal active constituent is evenly dispersed, has potential industrial applications prospect.
Specific embodiment
It is of the invention in order to make the invention proposes a kind of nano silver catalyst for catalytic combustion, preparation method and applications
Advantage, technical solution are clearer, clear, elaborate combined with specific embodiments below to the present invention.
γ-Al in following instance2O3It is purchased from the auxiliary reagent factory Wei Bo of Jiangyan City；SiO2Purchased from Qingdao Mei Gao group；TiO2It is purchased from
The plentiful and substantial Chemical Co., Ltd. in Changzhou；Cordierite honeycomb substrate is purchased from 62 holes of Corning Incorporated/cm2。
Embodiment 1:
7.5%Ag-5%Mn-10%Ce/Al2O3The preparation of integral catalyzer:
At room temperature by Al2O3Incipient impregnation is in the nitrate solution of appropriate Ag, Mn, Ce, the dry 10h in baking oven, most
Afterwards under air atmosphere, 7.5%Ag-5%Mn-10%Ce/Al is made in 500 DEG C of roasting 4h2O3Catalyst.Obtained catalyst is added
Enter in deionized water and ball milling is slurried, is coated on cordierite honeycomb ceramic matrix (2.5cm3) on, then done in 120 DEG C of baking ovens
Dry 5h obtains 7.5%Ag-5%Mn-10%Ce/Al in 450 DEG C of Muffle kiln roasting 3h2O3Integral catalyzer.Catalyst agent
The coated weight of coating is controlled in 150g/L.
Embodiment 2:
5%Ag-5%Mn-10%Ce/Al2O3The preparation of integral catalyzer
At room temperature by Al2O3Incipient impregnation is modified in the nitrate of appropriate Mn, Ce, and the carrier after dipping heats 110 DEG C
Dry 10h；In 300-800 DEG C of roasting 2-12h in air atmosphere, modified carrier is obtained, then by modified Al2O3Equal bodies
Product is impregnated in AgNO3Then solution dries 10h in baking oven, finally under air atmosphere, 500 DEG C of roasting 4h are made 2.5%
Ag-5%Mn-10%Ce/Al2O3Catalyst.Obtained catalyst is added in deionized water and ball milling is slurried, is coated on cordierite
Ceramic honey comb matrix (2.5cm3) on, then dry 5h is obtained in 450 DEG C of Muffle kiln roasting 3h in 120 DEG C of baking ovens
2.5%Ag-5%Mn-10%Ce/Al2O3Integral catalyzer.The coated weight of catalyst agent coating is controlled in 150g/L.
Embodiment 3:
7.5%Ag-8%Mn-10%Ce/Al2O3The preparation of integral catalyzer
At room temperature by Al2O3Incipient impregnation is modified in the nitrate of appropriate Mn, Ce, and the carrier after dipping heats 110 DEG C
Dry 10h；In 300-800 DEG C of roasting 2-12h in air atmosphere, modified carrier is obtained, then by modified Al2O3Equal bodies
Product is impregnated in AgNO3Solution, the dry 10h in baking oven, finally under air atmosphere, 7.5%Ag- is made in 500 DEG C of roasting 4h
8%Mn-10%Ce/Al2O3Catalyst.Obtained catalyst is added in deionized water and ball milling is slurried, is coated on cordierite honeycomb
Ceramic matrix (2.5cm3) on, 5h is then dried in 120 DEG C of baking ovens obtains 7.5%Ag- in 450 DEG C of Muffle kiln roasting 3h
8%Mn-10%Ce/Al2O3Integral catalyzer.The coated weight of catalyst agent coating is controlled in 150g/L.
Embodiment 4:
10%Ag-10%Mn-5%Ce/Al2O3The preparation of integral catalyzer
At room temperature by Al2O3Incipient impregnation is modified in the nitrate of appropriate Mn, Ce, and the carrier after dipping heats 110 DEG C
Dry 10h；In 300-800 DEG C of roasting 2-12h in air atmosphere, modified carrier is obtained, then by modified Al2O3Equal bodies
Product is impregnated in AgNO3Solution, the dry 10h in baking oven, finally under air atmosphere, 10%Ag- is made in 500 DEG C of roasting 4h
10%Mn-5%Ce/Al2O3Catalyst.Obtained catalyst is added in deionized water and ball milling is slurried, is coated on cordierite honeycomb
Ceramic matrix (2.5cm3) on, 5h is then dried in 120 DEG C of baking ovens obtains 10%Ag- in 450 DEG C of Muffle kiln roasting 3h
10%Mn-5%Ce/Al2O3Integral catalyzer.The coated weight of catalyst agent coating is controlled in 150g/L.
Embodiment 5:
12.5%Ag/Al2O3The preparation of integral catalyzer
At room temperature by Al2O3Incipient impregnation is in AgNO3Solution, the dry 10h in baking oven, finally under air atmosphere,
12.5%Ag/Al is made in 500 DEG C of roasting 4h2O3Catalyst.Obtained catalyst is added in deionized water and ball milling is slurried, is coated
In cordierite honeycomb ceramic matrix (2.5cm3) on, the then dry 5h in 120 DEG C of baking ovens, in 450 DEG C of Muffle kiln roasting 3h,
Obtain 12.5%Ag/Al2O3Integral catalyzer.The coated weight of catalyst agent coating is controlled in 150g/L.
Embodiment 6:
Each integral catalyzer activity rating
The determination of activity of catalyst burn propane carries out in fixed-bed tube reactor.Monoblock type cordierite is urged
Agent is fitted into reactor, and reaction temperature is 150~400 DEG C, and mass flowmenter controls gas flow, control simulation gas (propane
Volume fraction 0.8%, remaining is air) air speed be 5000h-1, with gas chromatograph (Chongqing river instrument SC 3000B type, FID,
GDX-101 packed column) under detection different temperatures before and after reactor gaseous propane concentration.Record different catalysts catalysis burning third
When alkane, temperature corresponding to differentiated yields, T10Temperature needed for expression reaches 10% conversion ratio, T90Expression reaches 90% turn
Temperature needed for rate, the results are shown in Table 1.As seen from the results in Table 1, catalyst treatment propane prepared by the present invention is with higher urges
Change activity, especially 7.5%Ag-8%Mn-10%Ce/Al is made in embodiment 32O3Catalyst, catalytic activity highest, wherein T90
It is 280 DEG C.
The integral catalyzer catalysis burn propane activity of 1 embodiment 1-5 of table preparation
The related technology contents that do not address in aforesaid way are taken or are used for reference prior art and can be realized.
It should be noted that those skilled in the art can also make such or such appearance under the introduction of this specification
Easy variation pattern, such as equivalent way or obvious mode of texturing.Above-mentioned variation pattern should all protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of nano silver catalyst for catalytic combustion, it is characterised in that required raw material includes following components:
Using honeycomb-like cordierite as matrix；
Using noble metal as catalyst activity component；
Using one of Ce, Zr or Mn or a variety of as modified component；
With Al2O3、SiO2、TiO2, one of zeolite molecular sieve be used as carrier；
Wherein, by mass percentage, the noble metal accounts for the 0.01%~20.0% of catalyst quality, and the modified component accounts for
The 0.1%~30% of catalyst quality.
2. nano silver catalyst for catalytic combustion according to claim 1, it is characterised in that: the noble metal be selected from Pt, Ag,
Pd, Ru, Rh and Ir.
3. nano silver catalyst for catalytic combustion according to claim 2, it is characterised in that: the noble metal is selected from Ag.
4. the preparation method of nano silver catalyst for catalytic combustion according to claim 1, it is characterised in that including following step
It is rapid: carrier being placed in the aqueous solution of modified component and impregnated, heated, roasted and to obtain modified carrier；It will be described modified
Carrier be placed in the water-soluble salt solution of active component and impregnate, is dry, roasting to obtain coat；Slurry is made in the coat
Honeycomb-like cordierite is immersed by liquid, and coated, drying roasts obtained catalyst.
5. the preparation method of nano silver catalyst for catalytic combustion according to claim 4, it is characterised in that: the carrier leaching
Stain in the aqueous solution of isometric modified component, dipping 2~for 24 hours.
6. the preparation method of nano silver catalyst for catalytic combustion according to claim 4, it is characterised in that: the carrier exists
Be 110 DEG C of dry 10h in temperature after being impregnated in the aqueous solution of modified component, in air atmosphere in 300~800 DEG C of roastings 2~
12h。
7. the preparation method of nano silver catalyst for catalytic combustion according to claim 4, it is characterised in that: modified load
Body is placed in the water-soluble salt solution of isometric active component dipping 2~for 24 hours, is 110 DEG C of dry 10h, air gas in temperature
In 300~800 DEG C of 2~12h of roasting in atmosphere.
8. the preparation method of nano silver catalyst for catalytic combustion according to claim 4, it is characterised in that: by the coating
Layer plus 1~6h of water for ball milling slurries are made, honeycomb-like cordierite is immersed, it is coated, be placed in Muffle furnace air atmosphere in
300~800 DEG C of 2~12h of roasting.
9. the preparation method of nano silver catalyst for catalytic combustion according to claim 4, it is characterised in that: the water solubility
Salting liquid is selected from nitrate solution.
10. nano silver catalyst for catalytic combustion according to claim 1 or 2 or 3 is in the application administered in propane exhaust gas.
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