CN114644845B - Heat-conducting catalyst coating and preparation method and application thereof - Google Patents
Heat-conducting catalyst coating and preparation method and application thereof Download PDFInfo
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- CN114644845B CN114644845B CN202210367166.1A CN202210367166A CN114644845B CN 114644845 B CN114644845 B CN 114644845B CN 202210367166 A CN202210367166 A CN 202210367166A CN 114644845 B CN114644845 B CN 114644845B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 148
- 238000000576 coating method Methods 0.000 title claims abstract description 82
- 239000011248 coating agent Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 64
- 239000003085 diluting agent Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000002270 dispersing agent Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000006185 dispersion Substances 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 32
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 239000002131 composite material Substances 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 12
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
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- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 9
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
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- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 8
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 8
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 7
- 229960005070 ascorbic acid Drugs 0.000 claims description 6
- 235000010323 ascorbic acid Nutrition 0.000 claims description 6
- 239000011668 ascorbic acid Substances 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
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- 229910020785 La—Ce Inorganic materials 0.000 claims description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
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- 229910000510 noble metal Inorganic materials 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 229910052684 Cerium Inorganic materials 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 238000003421 catalytic decomposition reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 4
- 239000004480 active ingredient Substances 0.000 description 3
- 150000001555 benzenes Chemical class 0.000 description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- 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 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- VGBWDOLBWVJTRZ-UHFFFAOYSA-K cerium(3+);triacetate Chemical compound [Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O VGBWDOLBWVJTRZ-UHFFFAOYSA-K 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- JLRJWBUSTKIQQH-UHFFFAOYSA-K lanthanum(3+);triacetate Chemical compound [La+3].CC([O-])=O.CC([O-])=O.CC([O-])=O JLRJWBUSTKIQQH-UHFFFAOYSA-K 0.000 description 1
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002082 metal nanoparticle Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- 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
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
-
- B01J35/613—
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- B01J35/615—
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention provides a heat-conducting catalyst coating and a preparation method and application thereof, wherein the preparation raw materials of the heat-conducting catalyst coating comprise a component A, a component B and a diluent; the A component comprises a catalyst active component and a binder; the component B comprises graphene and a dispersing agent. The preparation method comprises the following steps: mixing the component A, the component B and the diluent according to the formula amount, and sanding to obtain the heat-conducting catalyst coating. According to the invention, the catalyst active component and the graphene are organically combined together, so that the stable heat-conducting catalytic coating can be obtained, the dispersion stability of the catalyst active component and the graphene is improved, the uniform film forming property of the catalyst active component and the few-layer graphene in the later application process is facilitated, and the cracking of the catalyst active component and the few-layer graphene in the coating caused by the difference of the thermal expansion coefficients of the catalyst active component and the few-layer graphene is avoided. The preparation method provided by the invention has the advantages of low cost and simple process, and is beneficial to industrial production.
Description
Technical Field
The invention belongs to the field of environment-friendly catalysts, and particularly relates to a heat-conducting catalyst coating, a preparation method and application thereof.
Background
Volatile organic gases such as aldehydes, benzene series and the like discharged by interior decoration, furniture and the like and volatile organic gases discharged by catering lampblack are catalytically decomposed into carbon dioxide and water at 300-450 ℃ by means of a catalyst, so that the catalyst is one of the most effective purification technologies. However, the current air purifier in the market is operated at normal temperature, a heat source for maintaining catalytic decomposition cannot be provided, and indoor polluted gas cannot be catalytically decomposed and purified.
The existing aluminum fin heat dissipation type graphene radiator is a novel radiator, has great advantages compared with a common radiator, and has the advantage of fast temperature rise. The heat source that can be provided can be maintained at about 200-260 deg.c. The catalyst is coated on the aluminum fin heat dissipation type graphene radiator, so that the indoor volatile organic gas can be catalytically decomposed while heat dissipation is realized.
The active components of the catalyst are noble metal and transition metal oxide, the thermal expansion coefficient difference between the active components and graphene is huge, the interface mismatch problem exists between the catalytic layer and the graphene layer, and the problem of cracking and falling between the two interfaces is caused in the heating process. In addition, the graphene has few surface functional groups, and lacks effective connection with the catalytic active components, so that the problem of cracking and falling off between two interfaces is caused. In addition, the activity of the catalyst is low, and the catalyst can decompose volatile components such as benzene series and the like at a high temperature of more than 250 ℃ often. The valence state of the noble metal is the key for influencing the catalytic activity, and the catalytic activity can be obviously improved and the catalytic reaction temperature can be reduced to the required temperature by reasonably designing and controlling the components, the content and the valence state distribution of the noble metal and the interaction between the noble metal and the catalyst carrier.
On one hand, by means of rapid heat conduction and heat dissipation of graphene, the catalytic active components closely contacted with graphene can be rapidly heated to a proper temperature and can be uniformly heated, and the catalytic active sites can be used for efficiently catalytically decomposing volatile organic gases such as benzene series and the like; on the other hand, by means of the rapid heat conduction and radiation of graphene, the exothermic effect generated by catalytic decomposition of volatile organic gas can be rapidly emitted, deactivation caused by high-temperature agglomeration of catalytic active sites is avoided, and the service life of the catalytic active components can be prolonged.
CN 106732585A discloses a monolithic catalyst for catalytic combustion of volatile organic gas and a preparation method thereof, wherein cordierite is taken as a carrier, and gamma-Al is taken as a catalyst carrier 2 O 3 The cordierite honeycomb ceramic carrier comprises 82-87 parts by mass of an oxide auxiliary agent and an active ingredient Pd as coating layers, wherein the gamma-Al is prepared by mixing the following components in percentage by mass 2 O 3 10-14 parts by weight of the oxide auxiliary agent, 0.8-1.5 parts by weight of the active ingredient Pd and 0.01-0.05 part by weight of the active ingredient Pd. Pd was dispersed to custom gamma-A by coating method l2 O 3 Drying and roasting the carrier to obtain powder, adding adhesive, lubricant and water to prepare slurry, loading the slurry on cordierite to obtain the catalyst, and purifying the catalyst at the toluene decomposition temperature of 300 ℃ with about 98%.However, the preparation method has 3 times of roasting, wastes energy, and needs 550-750 ℃ for 3-5 hours at the roasting temperature. However, such high firing temperatures and firing times severely disrupt the inherent service conditions of the graphene aluminum fins.
Therefore, how to develop a heat-conducting catalytic coating, spray the heat-conducting catalytic coating onto metal radiating substrates such as aluminum fins and the like can solve the problem that the interface of the coating is cracked and falls off due to the difference of the thermal expansion coefficients of the graphene and the catalytic active components in the prior art, and solve the problem that the heat treatment requirement of the substrates such as the graphene aluminum fins and the like cannot be met due to the requirement of high-temperature activation in the preparation process of the catalyst, so that the efficient and low-energy-consumption catalytic decomposition of volatile organic substances is realized, and becomes the key point of the current research.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a heat-conducting catalyst coating and a preparation method and application thereof. According to the heat-conducting catalyst coating disclosed by the invention, graphene and a catalyst are organically combined together, and the graphene and the catalyst are closely contacted and can be sprayed to form a film, so that the heat-conducting catalyst coating has the advantages of high catalytic activity, rapid and uniform temperature rise and high catalytic activity; the preparation method has the advantages of simple process, mild condition, easy industrialization and higher application value.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a heat-conducting catalyst coating, which is prepared from the following raw materials in percentage by mass:
6-23wt% of A component
1.8-15wt% of component B
Diluent 62-92.2wt%
The total mass percent of the component A, the component B and the diluent is 100wt%;
the A component comprises a catalyst active component and a binder;
the B component comprises graphene and a dispersing agent.
According to the heat-conducting catalyst disclosed by the invention, graphene and a catalyst active component are organically combined together, so that a stable heat-conducting catalytic coating can be obtained, the dispersion stability of the catalytic active component and the few-layer graphene is improved, the uniform film forming property of the catalytic active component and the few-layer graphene in the later application process is facilitated, and the cracking of the catalytic active component and the few-layer graphene in the coating caused by the difference of the thermal expansion coefficients of the catalytic active component and the few-layer graphene is avoided; the high-efficiency and low-energy-consumption catalytic decomposition of volatile organic substances is realized.
Preferably, the preparation raw materials of the heat-conducting catalyst coating comprise the following components in percentage by mass: the mass fraction of the active component of the catalyst is 5-15wt%, for example, 5wt%, 8wt%, 10wt%, 12wt% or 15wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the mass fraction of the binder is 1-8wt%, for example, 1wt%, 2wt%, 3wt%, 4wt%, 5wt%, 6wt%, 7wt% or 8wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the mass fraction of graphene is 1-10wt%, such as 1wt%, 2wt%, 4wt%, 6wt%, 8wt% or 10wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the mass fraction of the dispersant is 0.8-5wt%, for example, 0.8wt%, 1wt%, 2wt%, 3wt%, 4wt% or 5wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the mass fraction of the diluent is 62-92.2wt%, for example 62wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt%, 90wt% or 92.2wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable; the total mass fraction of the catalyst active component, the binder, the graphene, the dispersing agent and the diluent is 100wt%.
Preferably, the catalyst active component comprises a reducing agent and a complex catalyst.
Preferably, the mass fraction of reducing agent in the active component of the catalyst is 1-4wt%, for example, 1wt%, 2wt%, 3wt% or 4wt%, but is not limited to the recited values, other non-recited values within the range of values are equally applicable.
Preferably, the mass fraction of the composite material in the catalyst active component is 96-99wt%, for example 96wt%, 96.5wt%, 97wt%, 97.5wt%, 98wt%, 98.5wt% or 99wt%, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the total mass fraction of the reducing agent and the composite material in the catalyst active component is 100wt%.
Preferably, the composite catalyst comprises Pt-Pd-La-Ce +.
A composite catalyst. />
The active components in the composite catalyst are Pt, pd, la and Ce, so as to
Based on the mass fraction of Pt, pd is 0.5-3wt%, la is 1-5wt%, and Ce is 1-5wt%.
The Pt-Pd-La-Ce-
The raw materials used in the preparation process of the composite catalyst comprise precursor salts of Pt, pd, lanthanum and cerium.
Illustratively, the precursor salt of Pt includes any one or a combination of at least two of palladium nitrate, aminopalladium nitrate, or aminopalladium chloride, and typical but non-limiting combinations include a combination of palladium nitrate and aminopalladium nitrate, a combination of aminopalladium nitrate and aminopalladium chloride, a combination of palladium nitrate and aminopalladium chloride, or a combination of palladium nitrate, aminopalladium nitrate, and aminopalladium chloride.
Illustratively, the precursor salts of Pd include platinum nitrate and/or chloroplatinic acid.
Illustratively, the precursor salt of lanthanum includes lanthanum nitrate and/or lanthanum acetate.
Illustratively, the precursor salt of cerium includes cerium nitrate and/or cerium acetate.
Preferably, the average particle size of the catalyst active component is 3 to 8. Mu.m, for example, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm or 8 μm, but not limited to the values recited, other values not recited in the numerical range are equally applicable.
Preferably, the specific surface area of the catalyst active component is 80-180cm 2 The/g may be 80cm, for example 2 /g、100cm 2 /g、110cm 2 /g、120cm 2 /g、130cm 2 /g、140cm 2 /g、150cm 2 /g、160cm 2 /g、170cm 2 /g or 180cm 2 The values of/g are not limited to the values recited, but other values not recited in the numerical range are equally applicable.
Preferably, the reducing agent comprises ascorbic acid and/or citric acid.
Preferably, the binder comprises any one or a combination of at least two of an aluminum sol, a silica sol, or a water glass, including, typically but not limited to, a combination of an aluminum sol and a silica sol, a combination of an aluminum sol and a water glass, a combination of a silica sol and a water glass, or a combination of an aluminum sol, a silica sol, and a water glass.
Preferably, the average particle diameter of the graphene is not more than 5 μm, and may be, for example, 5 μm, 4 μm, 3 μm, 2 μm or 1 μm, but not limited to the values recited, and other values not recited in the numerical range are equally applicable.
Preferably, the thickness of the graphene is less than or equal to 20nm, for example, 20nm, 19nm, 18nm, 17nm, 16nm, 15nm, 14nm, 13nm or 12nm, but is not limited to the recited values, and other non-recited values in the numerical range are equally applicable.
Preferably, the dispersant comprises any one or a combination of at least two of polyvinyl alcohol, polyethylene glycol, sodium hydroxymethyl cellulose, or polyvinylpyrrolidone, and typical but non-limiting combinations include combinations of polyvinyl alcohol and polyethylene glycol, combinations of polyvinyl alcohol and sodium hydroxymethyl cellulose, combinations of sodium hydroxymethyl cellulose, and polyvinylpyrrolidone, or combinations of polyvinyl alcohol, polyethylene glycol, sodium hydroxymethyl cellulose, and polyvinylpyrrolidone.
Preferably, the mass fraction of deionized water in the diluent is 80-98wt%, such as 80wt%, 82wt%, 84wt%, 86wt%, 88wt%, 90wt%, 94wt% or 98wt%, but not limited to the recited values, other non-recited values within the range of values are equally applicable.
Preferably, the mass fraction of the organic solvent in the diluent is 2-20wt%, such as 2wt%, 6wt%, 10wt%, 14wt%, 18wt% or 20wt%, but not limited to the recited values, other non-recited values within the range of values are equally applicable.
Preferably, the total mass fraction of deionized water and organic solvent in the diluent is 100wt%.
Preferably, the organic solvent comprises any one or a combination of at least two of ethylene glycol, propylene glycol or n-butyl acetate, and typical but non-limiting combinations include a combination of ethylene glycol and propylene glycol, a combination of ethylene glycol and n-butyl acetate, a combination of propylene glycol and n-butyl acetate, or a combination of ethylene glycol, propylene glycol and n-butyl acetate.
Preferably, the component A is prepared by a wet ball milling method.
Preferably, the wet ball milling method comprises the following steps:
mixing the active component of the catalyst and the adhesive, and performing wet ball milling to obtain the component A.
Preferably, the wet ball milling time is 20-40min, for example, 20min, 25min, 30min, 35min or 40min, but not limited to the recited values, and other non-recited values in the range of values are equally applicable.
Preferably, the rotational speed of the wet ball mill is 300-800rpm, and may be, for example, 300rpm, 350rpm, 400rpm, 450rpm, 500rpm, 600rpm, 700rpm or 800rpm, but is not limited to the recited values, and other non-recited values within the numerical range are equally applicable.
Preferably, the catalyst active component comprises a composite catalyst and a reducing agent.
Preferably, the mass ratio of the composite catalyst to the reducing agent is 1:1-4, for example, 1:1, 1:2, 1:3 or 1:4, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the component B is prepared by a dispersion method.
Preferably, the dispersion method comprises the steps of:
and mixing the graphene with the dispersing agent, and dispersing until the graphene does not settle in the dispersing agent, thereby obtaining the component B.
Preferably, the mass ratio of the graphene to the dispersing agent is 1: (0.2-0.5), which may be, for example, 1:0.2, 1:0.3, 1:0.4 or 1:0.5, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
The dispersing agent is solid powder, and when the dispersing agent is used, the dispersing agent is prepared into a dispersing agent solution with the mass concentration of 10-20wt%.
Preferably, the solid content of graphene in the graphene dispersion liquid in the component B is 10-20wt%, for example, may be 10wt%, 12wt%, 14wt%, 16wt%, 18wt% or 20wt%, but is not limited to the recited values, and other non-recited values in the numerical range are equally applicable.
Preferably, the rotational speed during the dispersion is 4000-6000rpm, for example 4000rpm, 4500rpm, 5000rpm, 5500rpm or 6000rpm, but not limited to the values recited, other non-recited values within the range of values are equally applicable.
In a second aspect, the present invention provides a method for preparing the thermally conductive catalyst coating according to the first aspect, the method comprising the steps of:
mixing the component A, the component B and the diluent according to the formula amount, and sanding to obtain the heat-conducting catalyst coating.
Preferably, the sanding speed is 1200-1800rpm, for example, 1200rpm, 1250rpm, 1300rpm, 1350rpm, 1400rpm, 1450rpm, 1500rpm, 1550rpm, 1600rpm, 1700rpm or 1800rpm, but not limited to the recited values, other non-recited values within the range of values are equally applicable.
Preferably, the sanding process is repeated 3-6 times, for example, 3 times, 4 times, 5 times or 6 times.
Preferably, the interval between two adjacent times of repeated sanding is 3-8min, for example, 3min, 3.5min, 4min, 4.5min, 5min, 5.5min, 6min, 6.5min, 7min, 7.5min or 8min, but not limited to the recited values, and other non-recited values in the numerical range are equally applicable.
As a preferred technical scheme of the preparation method according to the second aspect of the present invention, the preparation method comprises the following steps:
mixing the component A, the component B and the diluent according to the formula amount, and repeatedly sanding for 3-6 times at the rotating speed of 1200-1800rpm to obtain the heat-conducting catalyst coating; the interval time between two adjacent times of repeated sanding is 3-8min; the mass fraction of deionized water in the diluent is 80-98wt%, and the mass fraction of the organic solvent is 2-20wt%;
the component A is prepared by the following method:
mixing the active component of the catalyst and the adhesive, and performing wet ball milling at a rotating speed of 300-800rpm for 20-40min to obtain a component A; the mass fraction of the reducing agent in the active components of the catalyst is 1-4wt% and the mass fraction of the composite catalyst is 96-99wt%;
the component B is prepared by the following method:
mixing graphene and a dispersing agent, and dispersing the graphene at a rotating speed of 4000-6000rpm until the graphene does not sediment in the dispersing agent, so as to obtain the component B; the mass ratio of the graphene to the dispersing agent is 1: (0.2-0.5).
In a third aspect, the present invention provides the use of a thermally conductive catalyst coating as described in the first aspect for toluene purification.
The numerical ranges recited herein include not only the above-listed point values, but also any point values between the above-listed numerical ranges that are not listed, and are limited in space and for the sake of brevity, the present invention is not intended to be exhaustive of the specific point values that the stated ranges include.
Compared with the prior art, the invention has the beneficial effects that:
(1) The heat-conducting catalyst coating provided by the invention simultaneously comprises graphene and a catalyst active component, wherein the graphene is treated by a dispersing agent and then is uniformly mixed with the catalyst active component, and the film is formed after spraying, so that the heat-conducting catalyst coating has the advantages of rapid and uniform temperature rise of a catalytic active site, high catalytic activity and no falling and cracking of the catalytic active component and the graphene due to close contact;
(2) The catalyst active component in the heat-conducting catalyst coating provided by the invention maintains noble metal valence distribution after being reduced by the reducing agent, has the functions of heat-resistant stability and high oxygen storage of coupling lanthanum and cerium, and has the advantages of high efficiency and low energy consumption under the condition of heat treatment at low temperature of 200-250 ℃ for 0.5-3 hours;
(3) The preparation method provided by the invention has the advantages of simple process, mild conditions, easiness in industrialization and higher application value.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
For the catalytic purification effect of the p-toluene on the surface of the heat-conducting catalyst coating material, the composite catalyst used in the specific embodiment of the invention is the same composite catalyst, and the catalyst specifically comprises: pt-Pd-La-Ce-
Composite catalyst, in->
For reference, the mass fraction of Pt was 1.5wt%, the mass fraction of Pd was 2.1wt%, the mass fraction of La was 2.2wt%, and the mass fraction of Ce was 3.2wt%.
Example 1
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 20wt% of a component A, 8wt% of a component B and 72wt% of a diluent.
The preparation method of the heat-conducting catalyst coating comprises the following steps:
mixing the component A, the component B and the diluent according to the formula amount, and repeatedly sanding for 5 times at a rotating speed of 1500rpm to obtain the heat-conducting catalyst coating; the interval time between two adjacent times of repeated sanding is 5min; the mass fraction of deionized water in the diluent is 90wt%, and the mass fraction of ethylene glycol is 10wt%;
the component A is prepared by the following method:
mixing the catalyst active component and the alumina sol, and performing wet ball milling at a rotating speed of 500rpm for 30min to obtain a component A; the mass fraction of the ascorbic acid in the active components of the catalyst is 2wt%, and the mass fraction of the composite catalyst is 98wt%; the mass ratio of the catalyst active component to the alumina sol is 3:2;
the component B is prepared by the following method:
mixing graphene and polyvinyl alcohol, and dispersing at a rotation speed of 5000rpm until the graphene does not sediment in a polyvinyl alcohol aqueous solution to obtain the component B; the mass ratio of the graphene to the polyvinyl alcohol is 1:0.3; the mass concentration of the polyvinyl alcohol aqueous solution is 15wt%;
the heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Example 2
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 15wt% of component A, 1.8wt% of component B and 83.2wt% of diluent.
The preparation method of the heat-conducting catalyst coating comprises the following steps:
mixing the component A, the component B and the diluent according to the formula amount, and repeatedly sanding for 6 times at the rotating speed of 1200rpm to obtain the heat-conducting catalyst coating; the interval time between two adjacent times of repeated sanding is 3min; the mass fraction of deionized water in the diluent is 98wt%, and the mass fraction of propylene glycol is 2wt%;
the component A is prepared by the following method:
mixing the catalyst active component and silica sol, and carrying out wet ball milling at a rotating speed of 300rpm for 40min to obtain a component A; the mass fraction of citric acid in the catalyst active component is 1wt%, and the mass fraction of the composite catalyst is 99wt%; the mass ratio of the catalyst active component to the silica sol is 10:5;
the component B is prepared by the following method:
mixing graphene and sodium hydroxymethyl cellulose, and dispersing at 4000rpm until the graphene does not sediment in the sodium hydroxymethyl cellulose aqueous solution to obtain the component B; the mass ratio of the graphene to the sodium hydroxymethyl cellulose is 1:0.4; the mass concentration of the sodium hydroxymethyl cellulose aqueous solution is 15wt%.
The heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Example 3
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 23wt% of a component A, 15wt% of a component B and 62wt% of a diluent.
The preparation method of the heat-conducting catalyst coating comprises the following steps:
mixing the component A, the component B and the diluent according to the formula amount, and repeatedly sanding for 3 times at the rotating speed of 1800rpm to obtain the heat-conducting catalyst coating; the interval time between two adjacent times of repeated sanding is 8min; the mass fraction of deionized water in the diluent is 80wt%, and the mass fraction of n-butyl acetate is 20wt%;
the component A is prepared by the following method:
mixing the catalyst active component and silica sol, and performing wet ball milling at a rotating speed of 800rpm for 20min to obtain a component A; the mass fraction of the ascorbic acid in the active components of the catalyst is 4wt%, and the mass fraction of the composite catalyst is 96wt%; the mass ratio of the catalyst active component to the silica sol is 15:8;
the component B is prepared by the following method:
mixing graphene and polyvinylpyrrolidone, dispersing at 6000rpm until the graphene does not settle in the polyvinylpyrrolidone aqueous solution, and obtaining the component B; the mass ratio of the graphene to the polyvinylpyrrolidone is 1:0.2; the mass concentration of the polyvinylpyrrolidone aqueous solution is 15wt%.
The heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Example 4
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 20wt% of a component A, 8wt% of a component B and 72wt% of a diluent. The preparation method of the heat-conducting catalyst coating is the same as in example 1 except that ascorbic acid in the preparation process of the component A is omitted.
The heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Example 5
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 20wt% of a component A, 8wt% of a component B and 72wt% of a diluent.
The preparation method of the heat-conducting catalyst coating is the same as that of the example 1.
The heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 450 ℃.
Example 6
The embodiment provides a heat-conducting catalyst coating, which comprises the following components in percentage by mass: 20wt% of a component A, 8wt% of a component B and 72wt% of a diluent.
The preparation method of the heat-conducting catalyst coating is the same as that of the example 1.
The heat-conducting catalyst coating prepared in the embodiment is sprayed on an aluminum sheet which is sprayed with a graphene coating on the market, and is dried for 0.5h at the temperature of 250 ℃.
Comparative example 1
The present comparison provides a thermally conductive catalyst coating comprising, in mass percent: 30wt% of a component A, 8wt% of a component B and 62wt% of a diluent.
The preparation method of the heat-conducting catalyst coating is the same as that of the example 1.
The heat-conducting catalyst coating prepared in the comparative example is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Comparative example 2
The present comparison provides a thermally conductive catalyst coating comprising, in mass percent: 20wt% of a component A, 18wt% of a component B and 62wt% of a diluent.
The preparation method of the heat-conducting catalyst coating is the same as that of the example 1.
The heat-conducting catalyst coating prepared in the comparative example is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
Comparative example 3
The present comparison provides a thermally conductive catalyst coating comprising, in mass percent: 20wt% of A component and 80wt% of diluent.
The preparation method of the heat-conducting catalyst coating is the same as that of the example 1.
The heat-conducting catalyst coating prepared in the comparative example is sprayed on an aluminum sheet of commercial electric heater, and is dried for 0.5h at the temperature of 250 ℃.
The heat conductive catalyst coatings prepared in examples 1 to 6 and comparative examples 1 to 3 were subjected to catalytic performance test, the test results are shown in table 1, and the test methods are as follows:
the commercial warm air of examples 1-6 and comparative examples 1-3, on which the thermally conductive catalyst coating had been sprayed, was placed at 3m 3 The test chamber was filled with toluene at an initial concentration of 10ppm. After the commercial electric heating power supply is connected for 1h, the toluene concentration in the cabin is tested. Toluene (toluene)Purification efficiency= (initial toluene concentration-toluene concentration after reaction)/initial toluene concentration x 100%. The concentration of VOCs in the gas before and after the reaction was measured by gas chromatography (Shimadzu GC-2014), and the VOCs gas was separated by an Rt-stabiwax column (30 m. Times.0.53 mm. Times.10 μm) and detected by a FID detector.
TABLE 1
| Toluene purification efficiency/% | |
| Example 1 | 100.0 |
| Example 2 | 97.2 |
| Example 3 | 92.9 |
| Example 4 | 86.5 |
| Example 5 | 87.5 |
| Example 6 | 80.5 |
| Comparative example 1 | 94.3 |
| Comparative example 2 | 91.5 |
| Comparative example 3 | 91.5 |
In comparison with example 1 and example 4, it was found that the ascorbic acid reducing agent was able to reduce noble metals to a reasonable valence distribution of metallic and oxidized states, which is why the catalytic activity was high.
Example 1 compared with example 5, it was found that the change in the valence of the noble metal active site and the noble metal nanoparticle by calcining the catalytically active component at a high temperature of 450 ℃ is a cause of low catalytic activity.
In example 1, compared with example 6, the catalytically active coating layer was formed on the graphene coating layer surface, and the catalytically active component was peeled off due to the difference in thermal expansion coefficient, which was responsible for the low catalytic activity.
Compared with comparative example 3, example 1 shows that the addition of graphene can quickly and uniformly make the catalytic active site reach the required temperature, which is the reason for high catalytic activity.
In summary, the stable heat-conducting catalytic coating can be obtained by organically combining the catalyst active component and the graphene, so that the dispersion stability of the catalyst active component and the graphene is improved, the uniform film forming property of the catalyst active component and the few-layer graphene in the later application process is facilitated, and the cracking of the catalyst active component and the few-layer graphene in the coating caused by the difference of the thermal expansion coefficients of the catalyst active component and the few-layer graphene is avoided. The preparation method provided by the invention has the advantages of low cost and simple process, and is beneficial to industrial production.
The applicant states that the above embodiments are described in further detail for the purpose, technical solution and advantageous effects of the present invention, and it should be understood that the above embodiments are merely illustrative of the present invention and not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (21)
1. The heat-conducting catalyst coating is characterized by comprising the following preparation raw materials in percentage by mass:
6-23wt% of A component
1.8-15wt% of component B
Diluent 62-92.2wt%
The A component comprises a catalyst active component and a binder;
the component B comprises graphene and a dispersing agent;
the preparation raw materials of the heat-conducting catalyst coating comprise the following components in percentage by mass:
the catalyst active component comprises a reducing agent and a composite catalyst, wherein the reducing agent comprises ascorbic acid and/or citric acid;
the mass fraction of the reducing agent is 1-4wt% and the mass fraction of the composite catalyst is 96-99wt%;
the adhesive comprises any one or a combination of at least two of aluminum sol, silica sol or water glass;
the composite catalyst comprises Pt-Pd-La-Ce/gamma-Al 2 O 3 A composite catalyst.
2. The thermally conductive catalyst coating of claim 1, wherein the catalyst active component has an average particle size of 3-8 μm.
3. The thermally conductive catalyst coating of claim 1, wherein the specific surface area of the catalyst active component is 80-180cm 2 /g。
4. The thermally conductive catalyst coating of claim 1, wherein the graphene has an average particle size of 5 μm or less.
5. The thermally conductive catalyst coating of claim 1, wherein the graphene has a thickness of 20nm or less.
6. The thermally conductive catalyst coating of claim 1, wherein the dispersant comprises any one or a combination of at least two of polyvinyl alcohol, polyethylene glycol, sodium hydroxymethyl cellulose, or polyvinylpyrrolidone.
7. The thermally conductive catalyst coating as claimed in claim 1, wherein the mass fraction of deionized water in the diluent is 80-98wt%, the mass fraction of the organic solvent is 2-20wt%, and the total mass fraction of deionized water and the organic solvent is 100wt%.
8. The thermally conductive catalyst coating of claim 7, wherein the organic solvent comprises any one or a combination of at least two of ethylene glycol, propylene glycol, or n-butyl acetate.
9. The thermally conductive catalyst coating of claim 1 wherein the a component is prepared by a wet ball milling process.
10. The thermally conductive catalyst coating of claim 9, wherein the wet ball milling process comprises the steps of:
mixing the active component of the catalyst and the adhesive, and performing wet ball milling to obtain the component A.
11. The thermally conductive catalyst coating of claim 10, wherein the wet ball milling time is 20-40 minutes.
12. The thermally conductive catalyst coating of claim 10, wherein the rotational speed of the wet ball mill is 300-800rpm.
13. The thermally conductive catalyst coating of claim 1 wherein the B component is prepared by a dispersion process.
14. The thermally conductive catalyst coating of claim 13, wherein the dispersion method comprises the steps of:
and mixing the graphene with the dispersing agent, and dispersing until the graphene does not settle in the dispersing agent, thereby obtaining the component B.
15. The thermally conductive catalyst coating of claim 14, wherein the mass ratio of graphene to dispersant is 1:0.2-0.5.
16. The thermally conductive catalyst coating of claim 14, wherein the rotational speed during dispersion is 4000-6000rpm.
17. A method of preparing a thermally conductive catalyst coating as claimed in any one of claims 1 to 16, comprising the steps of:
mixing the component A, the component B and the diluent according to the formula amount, and sanding to obtain the heat-conducting catalyst coating.
18. The method of claim 17, wherein the rotational speed of the sanding is 1200-1800rpm.
19. The method of manufacturing according to claim 17, wherein the sanding process is repeated 3-6 times.
20. The method of claim 19, wherein the repeated sanding is performed between adjacent times for a period of 3 to 8 minutes.
21. Use of a thermally conductive catalyst coating as claimed in any of claims 1-16 for toluene purification.
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| CN114644845A (en) | 2022-06-21 |
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