CN113713803A - Catalytic active component, preparation method thereof, catalyst and application thereof - Google Patents
Catalytic active component, preparation method thereof, catalyst and application thereof Download PDFInfo
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- CN113713803A CN113713803A CN202111001845.9A CN202111001845A CN113713803A CN 113713803 A CN113713803 A CN 113713803A CN 202111001845 A CN202111001845 A CN 202111001845A CN 113713803 A CN113713803 A CN 113713803A
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- formaldehyde
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 67
- 239000003054 catalyst Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical group O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 117
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910001413 alkali metal ion Inorganic materials 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 27
- 239000007787 solid Substances 0.000 claims description 24
- 230000032683 aging Effects 0.000 claims description 22
- 238000006479 redox reaction Methods 0.000 claims description 22
- 229910001868 water Inorganic materials 0.000 claims description 20
- -1 alkali metal salt Chemical class 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 13
- 229910052783 alkali metal Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 150000002696 manganese Chemical class 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 239000012286 potassium permanganate Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 abstract description 12
- 238000000354 decomposition reaction Methods 0.000 abstract description 11
- 238000001179 sorption measurement Methods 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 238000001994 activation Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 17
- 238000001035 drying Methods 0.000 description 16
- 239000008247 solid mixture Substances 0.000 description 13
- 238000005406 washing Methods 0.000 description 13
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 description 10
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 10
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 10
- 239000008367 deionised water Substances 0.000 description 10
- 229910021641 deionized water Inorganic materials 0.000 description 10
- 238000004898 kneading Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 8
- 241000219782 Sesbania Species 0.000 description 8
- 239000000314 lubricant Substances 0.000 description 8
- 239000003607 modifier Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
- 229920002472 Starch Polymers 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003365 glass fiber Substances 0.000 description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 4
- 239000001103 potassium chloride Substances 0.000 description 4
- 235000011164 potassium chloride Nutrition 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 3
- ISPYRSDWRDQNSW-UHFFFAOYSA-L manganese(II) sulfate monohydrate Chemical compound O.[Mn+2].[O-]S([O-])(=O)=O ISPYRSDWRDQNSW-UHFFFAOYSA-L 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-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
- 239000000919 ceramic Substances 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229940071125 manganese acetate Drugs 0.000 description 2
- 229940082328 manganese acetate tetrahydrate Drugs 0.000 description 2
- 229940099596 manganese sulfate Drugs 0.000 description 2
- 239000011702 manganese sulphate Substances 0.000 description 2
- 235000007079 manganese sulphate Nutrition 0.000 description 2
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 description 2
- CESXSDZNZGSWSP-UHFFFAOYSA-L manganese(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Mn+2].CC([O-])=O.CC([O-])=O CESXSDZNZGSWSP-UHFFFAOYSA-L 0.000 description 2
- ALIMWUQMDCBYFM-UHFFFAOYSA-N manganese(2+);dinitrate;tetrahydrate Chemical compound O.O.O.O.[Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ALIMWUQMDCBYFM-UHFFFAOYSA-N 0.000 description 2
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 229910021592 Copper(II) chloride Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 241001464837 Viridiplantae Species 0.000 description 1
- GOPYZMJAIPBUGX-UHFFFAOYSA-N [O-2].[O-2].[Mn+4] Chemical group [O-2].[O-2].[Mn+4] GOPYZMJAIPBUGX-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 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 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 210000000987 immune system Anatomy 0.000 description 1
- 238000003905 indoor air pollution Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
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- 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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/32—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/613—10-100 m2/g
-
- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
Abstract
The invention belongs to the technical field of catalysts, and particularly relates to a catalytic active component, a preparation method thereof, a catalyst and application thereof. The invention provides a catalytic active component, which comprises manganese dioxide with a lamellar structure and alkali metal ions. In the invention, the lamellar structure of the manganese dioxide weakens the binding force of manganese-oxygen bonds in the manganese dioxide, thereby improving the active capacity of active oxygen and finally promoting the low-temperature decomposition of formaldehyde. The alkali metal ions are combined with the manganese dioxide sheet in the form of chemical bonds, so that not only can the sheet structure of the manganese dioxide be better maintained, but also the charge transfer of the catalyst is promoted, the adsorption and activation processes of the formaldehyde are effectively accelerated, and the low-temperature decomposition of the formaldehyde is promoted. The catalyst provided by the invention has higher molding strength, and is favorable for stably catalyzing and decomposing formaldehyde in fixed equipment.
Description
Technical Field
The invention belongs to the technical field of catalysts, and particularly relates to a catalytic active component, a preparation method thereof, a catalyst and application thereof.
Background
With the modernization level of production and living styles being higher and higher, the time of people moving indoors is longer and longer, and the requirement of people on indoor air quality is higher and higher. Many of the closed decorations for living rooms and interior decoration materials cause indoor air pollution, and many of the interior decoration materials emit harmful gases including formaldehyde, benzene, ammonia and other volatile pollutants, of which formaldehyde is the most important pollutant. The formaldehyde can be coagulated and denatured with protein in cells, can cause pathological changes of respiratory system, immune system, central system, nervous system and the like of human body, and has the characteristic of long release period, so that the research on the decomposition of the formaldehyde has great significance.
At present, various indoor formaldehyde treatment methods such as ventilation, negative ion technology, low-temperature plasma technology, green plant absorption, photocatalytic oxidation and the like exist, but most of the methods have some defects. The ventilation mode needs a long time, and the treatment effect is not obvious; the physical adsorption method has no selectivity and is easy to be desorbed by the influence of the environmental atmosphere so as to cause secondary pollution. The catalytic oxidation technology mainly utilizes oxygen in the air to decompose formaldehyde into carbon dioxide and water under the action of a catalyst, an external excitation light source is not needed, and the product is clean, so that the method is a long-term effective method for degrading formaldehyde in the air.
Chinese patent CN105597682A discloses a method for preparing modified activated carbon for removing formaldehyde at normal temperature, which takes granular, columnar, spherical or honeycomb-shaped coconut shell activated carbon with high specific surface area as a carrier and CuCl2And FeCl3Mixed metal salt as modified component with fast capture and high formaldehyde contentEfficient adsorption, low cost and the like, but has the problem of low formaldehyde conversion rate. Chinese patent CN102247842A discloses a high-efficiency catalyst for eliminating formaldehyde at room temperature, which can efficiently decompose low-concentration formaldehyde at normal temperature and humidity, and the catalyst is mainly prepared by loading Pt with mass fraction of less than 5% on TiO coated2-SnO2The catalyst is compounded in a cordierite honeycomb ceramic carrier of a composite oxide, and although the catalyst has high formaldehyde conversion rate, the bonding degree between the composite oxide and the honeycomb ceramic is weak, the composite oxide is easy to fall off, and the catalyst has the problems of unstable activity and the like after long-term use.
Disclosure of Invention
In view of the above, the invention provides a catalytic active component and a preparation method thereof, a catalyst and an application thereof, and the catalytic active component provided by the invention has good low-temperature catalytic activity and a stable structure, and can better catalyze, oxidize and degrade formaldehyde.
In order to solve the above technical problems, the present invention provides a catalytically active component comprising manganese dioxide having a lamellar structure and alkali metal ions.
Preferably, the mass ratio of the alkali metal ions to the manganese dioxide is 0.2-5: 100.
The invention also provides a preparation method of the catalytic active component in the technical scheme, which comprises the following steps:
mixing potassium permanganate, water-soluble divalent manganese salt, alkali metal salt and water for oxidation-reduction reaction to obtain the catalytic active component.
Preferably, the temperature of the oxidation-reduction reaction is 10-60 ℃ and the time is 0.5-4 h.
Preferably, the oxidation-reduction reaction further comprises:
sequentially carrying out aging and solid-liquid separation on the system after the redox reaction to obtain a solid;
and roasting the solid to obtain the catalytic active component.
Preferably, the aging temperature is 10-60 ℃ and the aging time is 0.5-6 h.
Preferably, the roasting temperature is 120-400 ℃, and the heat preservation time is 2-12 h.
Preferably, the molar ratio of the potassium permanganate to the divalent manganese salt to the alkali metal salt is 10-60: 10-80: 0.1-20.
The invention provides a catalyst which comprises the following preparation raw materials in parts by mass:
the catalytic active component is the catalytic active component in the technical scheme or the catalytic active component prepared by the preparation method in the technical scheme.
The invention also provides the application of the catalyst in the technical scheme in catalytic oxidation of formaldehyde.
The invention provides a catalytic active component, which comprises manganese dioxide with a lamellar structure and alkali metal ions. In the invention, the lamellar structure of the manganese dioxide weakens the binding force of manganese-oxygen bonds in the manganese dioxide, thereby improving the active capacity of active oxygen and promoting the low-temperature decomposition of formaldehyde. In the invention, alkali metal ions are combined with manganese dioxide in a chemical bond form, and exist on the surface of the catalyst or are intercalated in a manganese dioxide lamellar structure, so that the lamellar structure of the manganese dioxide can be better maintained, the charge transfer of the catalyst is promoted, the adsorption and activation processes of formaldehyde are effectively accelerated, and the low-temperature decomposition of the formaldehyde is promoted.
The invention also provides a catalyst, which comprises the following preparation raw materials in parts by mass: 20-50 parts of a catalytic active component, 25-90 parts of a binder, 0.2-2 parts of an auxiliary binder, 1-12 parts of a pore structure modifier, 0.5-3.5 parts of a lubricant, 0-10 parts of a strength improver and 0-30 parts of water; the catalytic active component is the catalytic active component in the technical scheme or the catalytic active component prepared by the preparation method in the technical scheme. The catalyst provided by the invention has good stability and higher catalytic activity, and can be used for efficiently catalyzing and degrading formaldehyde at low temperature.
Drawings
FIG. 1 is an SEM photograph of the catalytically active component prepared in example 2, at a magnification of 100000;
FIG. 2 is an SEM photograph of the catalytically active component prepared in example 2, at a magnification of 150000.
Detailed Description
The invention provides a catalytic active component, which comprises manganese dioxide with a lamellar structure and alkali metal ions.
In the present invention, the mass ratio of the alkali metal ion to the manganese dioxide is preferably 0.2 to 5:100, and more preferably 1 to 4: 100. In the present invention, the alkali metal ion is combined with the manganese dioxide in the form of a chemical bond, and the alkali metal ion is present on the surface of the manganese dioxide or intercalated in a manganese dioxide lamellar structure.
In the present invention, the catalytically active component is in the form of microspheres. In the present invention, the manganese dioxide has a lamellar structure, and the manganese dioxide having a lamellar structure and the alkali metal ions intercalated in the lamellar structure of the manganese dioxide or attached to the surface of the manganese dioxide form microspheres.
The invention introduces alkali metal ions into the catalytic active component to promote the charge transfer of the catalyst and effectively accelerate the adsorption and activation processes of formaldehyde, thereby promoting the low-temperature decomposition of the formaldehyde. The specific process is as follows: the alkali metal and the manganese dioxide are combined in a chemical bond form, so that the charge transfer in the catalyst is accelerated, active oxygen is more active, the active oxygen is more easily combined with gaseous reactant formaldehyde, the adsorption and activation processes of the formaldehyde are effectively accelerated, and finally, carbon dioxide and water are generated through reaction, so that the low-temperature decomposition of the formaldehyde is promoted. The invention leads the catalytic active component to have good stability and higher catalytic activity under the combined action of manganese dioxide and alkali metal ions.
In the invention, the preparation method of the catalytic active component in the technical scheme comprises the following steps:
mixing potassium permanganate, water-soluble divalent manganese salt, alkali metal salt and water for oxidation-reduction reaction to obtain the catalytic active component.
In the present invention, the water-soluble divalent manganese salt includes one or more of manganese sulfate, manganese acetate and manganese nitrate. In the present invention, the manganese sulfate is preferably manganese sulfate monohydrate, the manganese acetate is preferably manganese acetate tetrahydrate, and the manganese nitrate is preferably manganese nitrate tetrahydrate. In the present invention, when the water-soluble divalent manganese salt includes two or more of the above-mentioned specific substances, the ratio of the specific substances in the present invention is not particularly limited, and any ratio may be used. In the embodiment of the present invention, the water-soluble divalent manganese salt is preferably a mixture of manganese sulfate monohydrate and manganese acetate tetrahydrate, manganese nitrate tetrahydrate or manganese sulfate monohydrate in a mass ratio of 30: 42.
In the present invention, the alkali metal ions in the alkali metal salt preferably include sodium ions and/or potassium ions; the alkali metal salt preferably comprises one or more of a hydrochloride, carbonate, bicarbonate and nitrate. In the present invention, the alkali metal salt specifically includes KCl, K2CO3、KHCO3、KNO3、NaCl、Na2CO3、NaHCO3And NaNO3More preferably sodium chloride, sodium carbonate, potassium chloride or potassium carbonate. In the present invention, when the alkali metal salt includes two or more of the above-mentioned specific substances, the ratio of the specific substances in the present invention is not particularly limited, and any ratio may be used.
In the present invention, the water is preferably deionized water.
In the invention, the mass concentration of the potassium permanganate in the mixed solution is preferably 2-10%, and more preferably 3-7%. In the invention, the molar ratio of the potassium permanganate, the water-soluble divalent manganese salt and the alkali metal salt is preferably 10-60: 10-80: 0.1-20, and more preferably 18-40: 30-58: 6-15.
The invention has no special requirements on the mixing mode as long as the mixing can be uniform. In the invention, the temperature of the oxidation-reduction reaction is preferably 10-60 ℃, and more preferably 25-40 ℃; the time of the oxidation-reduction reaction is preferably 0.5-4 h, and more preferably 1-3 h. In the present invention, the redox reaction is preferably accompanied by stirring. In the invention, the rotation speed of the stirring is preferably 100-1000 r/min, and more preferably 200-600 r/min.
In the present invention, the ion reaction equation of the redox reaction is preferably as shown in formula 1:
2MnO4 -+3Mn2++2H2O→5MnO2+4H+formula 1.
In the present invention, it is preferable that the oxidation-reduction reaction further includes:
sequentially carrying out aging and solid-liquid separation on the system after the redox reaction to obtain a solid;
and roasting the solid to obtain the catalytic active component.
According to the invention, the system after the oxidation-reduction reaction is subjected to aging and solid-liquid separation in sequence to obtain a solid. In the invention, the system becomes a brown turbid liquid after the oxidation-reduction reaction. In the present invention, the temperature of the aging is preferably the same as the temperature of the redox reaction. In the invention, the aging time is preferably 0.5-6 h, and more preferably 2-4 h. In the present publication, the aging is preferably accompanied by stirring, and the rotation speed of the stirring is preferably 100 to 1000r/min, more preferably 200 to 600 r/min. In the present invention, the aging enables the morphology and structure of the catalytically active component to be sufficiently stabilized.
The invention has no special requirements for the solid-liquid separation, as long as the solid-liquid separation can be realized. In the present invention, it is preferable that the solid-liquid separation further comprises: and washing and drying the solid obtained by the solid-liquid separation in sequence. In the invention, the washing solvent is preferably deionized water, and the pH value of the washing liquid after washing is preferably 5-7, and more preferably 6-6.5. The dosage of the detergent used in the invention is not particularly limited as long as the pH value of the washing solution can meet the required requirements. In the invention, the drying temperature is preferably 50-120 ℃, and more preferably 60-100 ℃; the drying time is preferably 6-24 hours, and more preferably 8-15 hours.
After the solid is obtained, the solid is roasted to obtain the catalytic active component. In the invention, the roasting temperature is preferably 120-400 ℃, and more preferably 150-200 ℃; the roasting heat preservation time is preferably 2-12 hours, and more preferably 4-8 hours. In the invention, the roasting can enable the catalytic active component to fully activate the active component so as to better exert the catalytic action.
The invention also provides a catalyst, which comprises the following preparation raw materials in parts by mass:
the catalytic active component is the catalytic active component in the technical scheme or the catalytic active component prepared by the preparation method in the technical scheme.
In the invention, the preparation raw materials of the catalytic active component comprise, by mass, 20-50 parts of the catalytic active component, preferably 35-40 parts.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components comprise 25-90 parts of binder, preferably 48-55 parts. In the invention, the binder preferably comprises silica sol and/or aluminum sol, and when the binder is silica sol and aluminum sol, the mass ratio of the silica sol to the aluminum sol is not particularly limited, and any ratio can be adopted. In the present invention, the solid content of the silica sol is preferably 30%. In the present invention, the solid content of the aluminum sol is preferably 20%.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components comprise 0.2-2 parts of auxiliary binder, preferably 0.9-1.3 parts. In the present invention, the auxiliary binder preferably includes carboxymethyl cellulose and/or polyoxyethylene, more preferably carboxymethyl cellulose or polyoxyethylene. In the invention, when the auxiliary binder is carboxymethyl cellulose and polyoxyethylene, the mass ratio of the carboxymethyl cellulose to the polyoxyethylene is not particularly limited, and any ratio can be adopted. In the embodiment of the present invention, when the auxiliary binder is carboxymethyl cellulose and polyoxyethylene, the mass ratio of the carboxymethyl cellulose and the polyoxyethylene is 2: 1.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components comprise 1-12 parts of pore structure modifier, and preferably 3-5 parts. In the present invention, the pore structure modifier preferably includes one or more of carbon powder, citric acid and oxalic acid, and more preferably carbon powder or citric acid. In the present invention, when the pore structure modifier includes two or more of the above specific substances, the proportion of the specific substances is not particularly limited, and any proportion may be adopted.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components comprise 0.5-3.5 parts of lubricant, preferably 1-2 parts, and more preferably 1.5-1.9 parts. In the present invention, the lubricant preferably comprises sesbania powder and/or starch, more preferably sesbania powder or starch; when the lubricant is sesbania powder and starch, the mass ratio of the sesbania powder to the starch is not particularly limited, and any proportion is adopted.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components comprise 0-10 parts of strength improver, preferably 0.5-3 parts, and more preferably 1.5-2.5 parts. In the present invention, the strength improver preferably comprises glass fiber, SiO2Fiber and Al2O3One or more of the fibers, more preferably glass fibers or SiO2A fiber. In the present invention, when the strength improver includes two or more of the above-mentioned specific substances, the ratio of the specific substances in the present invention is not particularly limited, and any ratio may be used.
According to the invention, the strength improver can effectively improve the forming strength of the catalyst, and is beneficial to stable catalysis of the catalyst in fixed equipment.
Based on the mass parts of the catalytic active components, the preparation raw materials of the catalytic active components also comprise 0-30 parts of water, and preferably 3-8 parts of water.
In the invention, the specific surface area of the catalyst is preferably 50-200 m2A concentration of 70 to 150m is more preferable2(ii) in terms of/g. In the invention, the strength of the catalyst is preferably 30-150N/cm, and more preferably 40-100N/cm. The shape of the catalyst is not particularly limited, and in the examples of the present invention, the catalyst has a columnar shape.
In the present invention, the preparation method of the catalyst preferably comprises the steps of:
mixing an active component, a pore structure modifier, a lubricant, a strength improver, a binder, an auxiliary binder and water, and kneading to obtain a blank;
sequentially ageing and molding the blank to obtain a green body;
and drying and roasting the green body in sequence to obtain the catalyst.
The invention mixes active component, pore structure modifier, lubricant, strength improver, binder, auxiliary binder and water, and kneads to obtain blank. In the present invention, the mixing preferably comprises the steps of:
carrying out first mixing on an active component, a pore structure modifier and a lubricant to obtain a solid mixture;
carrying out second mixing on the solid mixture and the strength improver to obtain a premix;
and thirdly mixing the premix, the binder, the auxiliary binder and water.
According to the invention, the active component, the pore structure modifier and the lubricant are subjected to first mixing to obtain a solid mixture. The present invention has no special requirement for the first mixing as long as it can mix uniformly. In the present invention, it is preferable that the first mixing further comprises: and crushing the first mixed product and then sieving the crushed product. The invention does not require any particular way of comminution, which in the examples of the invention is carried out in a mill. In the present invention, the mesh number of the sieving screen is preferably 200 meshes or more; and taking undersize products after sieving.
After obtaining the solid mixture, the invention carries out the second mixing of the solid mixture and the strength improver to obtain the premix. The second mixing is not particularly limited as long as the second mixing can be uniformly mixed. In the embodiment of the present invention, the second mixing is performed in a kneader, and the time of the second mixing is 10 to 60min, preferably 30 to 50 min.
After the premix is obtained, the premix, the binder, the auxiliary binder and water are subjected to third mixing. The third mixing is not particularly limited as long as the third mixing can be uniformly mixed. In the embodiment of the present invention, the third mixing is preferably performed in a kneader.
The invention can mix the raw materials uniformly by mixing step by step according to the steps to ensure that the obtained catalyst has uniform strength.
In the invention, the kneading is preferably carried out in a kneader, and the temperature of the kneading is preferably room temperature, and more preferably 20 to 30 ℃; the kneading time is preferably 10 to 120min, and more preferably 30 to 60 min.
After the blank is obtained, the blank is aged and formed in sequence to obtain a green body. In the invention, the staling is preferably carried out in a sealed staling in a self-sealing bag; the ageing time is preferably 6-24 hours, and more preferably 6-12 hours. In the invention, the staling can ensure that the kneaded blank is sufficiently cured. In the present invention, the shape of the green compact is not particularly limited, and the green compact may be designed according to the shape of the catalyst. In the embodiment of the invention, the green body is cylindrical, the diameter of the cylinder is 2.5-3 mm, and the height of the cylinder is 2.5-6 mm. The present invention has no particular requirement on the molding method as long as the desired shape can be obtained. In an embodiment of the invention, the shaping is carried out using an extruder.
After a green body is obtained, the green body is sequentially dried and roasted to obtain the catalyst. In the invention, the drying is preferably drying, and the drying temperature is preferably 50-100 ℃, and more preferably 60-80 ℃; the drying time is preferably 6-24 hours, and more preferably 8-12 hours. In the invention, the roasting temperature is preferably 120-400 ℃, and more preferably 150-200 ℃; the roasting heat preservation time is preferably 2-12 hours, and more preferably 4-8 hours.
The preparation method provided by the invention has the advantages that the raw material and production cost for preparing the catalyst are low, the contradiction between the cost and the performance of the catalyst is effectively solved, and the method can be widely applied to preparation of various air purifiers for removing formaldehyde.
The invention also provides the application of the catalyst in the technical scheme in catalytic oxidation of formaldehyde. The invention has no special requirements on the application mode and can be realized by adopting a conventional mode in the field. In the invention, the temperature of the catalytic oxidation of formaldehyde is preferably 0-45 ℃, and more preferably 10-30 ℃. When the catalyst is used for catalyzing and oxidizing formaldehyde, the formaldehyde is preferably degraded into carbon dioxide and water; the removal rate of formaldehyde is preferably 97.8-98.9%.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
30g of KMnO491.5g of Mn (NO) with a mass concentration of 50%3)2Solution, 7.5g of 1: 2 NaCl and Na2CO3The mixture was mixed with 1000g of deionized water and subjected to a redox reaction (with stirring at 300 r/min) at 25 ℃ for 3.5h to give a tan turbid solution;
aging the brown turbid liquid at 25 ℃ (with stirring at 300 r/min) for 2h, performing solid-liquid separation, washing the solid obtained by the solid-liquid separation with deionized water until the pH value of the washing liquid is 6, and drying at 100 ℃ for 12 h;
and roasting the dried solid for 6 hours at 120 ℃ to obtain the catalytic active component.
Example 2
50g of KMnO4、65g MnSO4·H2O, 10.5g KCl and 1000g deionized water were mixed and subjected to redox reaction at 60 deg.C (with 250r/min agitation)Stirring for 2 hours to obtain a brown turbid liquid;
aging the brown turbid liquid at 60 ℃ (with stirring at 250 r/min) for 3h, performing solid-liquid separation, washing the solid obtained by the solid-liquid separation with deionized water until the pH value of the washing liquid is 6, and drying at 80 ℃ for 10 h;
and roasting the dried solid for 2 hours at 200 ℃ to obtain the catalytic active component.
Example 3
45g of KMnO4、30g MnSO4·H2O、42g Mn(CH3COO)2·4H2O, 10.5g, the mass ratio of 1: KCl and K of 32CO3The mixture was mixed with 1000g of deionized water and subjected to a redox reaction (with stirring at 350 r/min) at 40 ℃ for 4h to give a tan turbid solution;
aging the brown turbid liquid at 40 ℃ (with stirring at 350 r/min) for 6h, performing solid-liquid separation, washing the solid obtained by the solid-liquid separation with deionized water until the pH value of the washing liquid is 7, and drying at 100 ℃ for 15 h;
and roasting the dried solid for 2 hours at 200 ℃ to obtain the catalytic active component.
Example 4
40g of KMnO4、62g Mn(NO3)2·4H2O、9.7g K2CO3Mixing with 1000g deionized water, and performing oxidation-reduction reaction (with stirring at 300 r/min) at 30 deg.C for 3 hr to obtain brown turbid solution;
aging the brown turbid liquid at 30 ℃ (with stirring at 300 r/min) for 4h, performing solid-liquid separation, washing the solid obtained by the solid-liquid separation with deionized water until the pH value of the washing liquid is 6.5, and drying at 80 ℃ for 10 h;
and roasting the dried solid for 2 hours at 150 ℃ to obtain the catalytic active component.
Scanning electron microscope observation is carried out on the catalytic active component prepared in example 2 to obtain SEM images as shown in figures 1 and 2; fig. 1 and 2 are SEM images at different magnifications.
As can be seen from fig. 1 and 2, the catalytically active component prepared in example 2 was in the form of microspheres consisting of a lamellar structure.
The catalytically active components prepared in example 1 and examples 3 and 4 were observed by scanning electron microscopy and the same conclusions were obtained as in example 2.
Example 5
25g of the active component prepared in the example 1, 3g of carbon powder and 1.5g of sesbania powder are subjected to first mixing, then crushed and sieved by a 200-mesh sieve, and undersize products are taken to obtain a solid mixture;
mixing the solid mixture and 3g of glass fiber in a kneader for 15min to obtain a premix;
kneading the premix, 48g of silica sol with the solid content of 30%, 1.2g of carboxymethyl cellulose and 5g of water in a kneader for 30min at 25 ℃ to obtain a blank;
placing the blank in a self-sealing bag, sealing and ageing for 12 hours, and then extruding a cylindrical green body with the diameter of 3mm and the height of 4.5mm by using an extruder;
and drying the green body at 80 ℃ for 10h, and roasting at 120 ℃ for 6h to obtain the catalyst.
Example 6
Firstly mixing 35g of the active component prepared in the example 2, 3g of carbon powder and 1g of starch, then crushing the mixture, sieving the mixture by a 200-mesh sieve, and taking undersize products to obtain a solid mixture;
mixing the solid mixture with 2.5g SiO2Mixing the fibers in a kneading machine for 10min to obtain a premix;
kneading the premix, 55g of silica sol with the solid content of 30%, 0.9g of carboxymethyl cellulose and 7g of water in a kneader for 30min at 35 ℃ to obtain a blank;
placing the blank in a self-sealing bag, sealing and ageing for 10 hours, and then extruding a cylindrical green body with the diameter of 2.5mm and the height of 4mm by using an extruder;
and drying the green body at 60 ℃ for 24h, and then roasting at 150 ℃ for 4h to obtain the catalyst.
Example 7
After 40g of the active component prepared in example 3, 5g of citric acid and 2g of sesbania powder are subjected to first mixing, the active component, the citric acid and the sesbania powder are crushed and sieved by a 200-mesh sieve, and undersize materials are taken to obtain a solid mixture;
mixing the solid mixture and 1.5g of glass fiber in a kneader for 15min to obtain a premix;
kneading the premix, 55g of alumina sol with the solid content of 20%, 1g of carboxymethyl cellulose, 0.5g of polyoxyethylene and 3g of water in a kneader at 25 ℃ for 60min to obtain a blank;
placing the blank in a self-sealing bag, sealing and ageing for 8 hours, and then extruding a cylindrical green body with the diameter of 3mm and the height of 4.5mm by using an extruder;
and drying the green body at 100 ℃ for 8h, and then roasting at 200 ℃ for 4h to obtain the catalyst.
Example 8
40g of the active component prepared in the example 4, 5g of carbon powder and 1.9g of sesbania powder are subjected to first mixing, then crushed and sieved by a 200-mesh sieve, and undersize products are taken to obtain a solid mixture;
mixing the solid mixture and 0.5g of glass fiber in a kneader for 20min to obtain a premix;
kneading the premix, 55g of silica sol with the solid content of 30%, 1.3g of carboxymethyl cellulose and 8g of water in a kneader for 30min at 25 ℃ to obtain a blank;
placing the blank in a self-sealing bag, sealing and ageing for 6 hours, and then extruding a cylindrical green body with the diameter of 2mm and the height of 4mm by using an extruder;
and drying the green body at 60 ℃ for 24h, and then roasting at 150 ℃ for 4h to obtain the catalyst.
Comparative example 1
The specific surface area is 500m2Per g of commercial activated carbon as comparative example.
The catalysts of examples 5-8 and comparative example 1 were used for catalytic oxidation of formaldehyde, and the formaldehyde decomposition efficiency is shown in table 1; the conditions of the catalytic oxidation are as follows: the gas source is a mixed gas of formaldehyde with the formaldehyde concentration of 100ppm and air, the humidity is 50 percent, the air is carrier gas, the reaction temperature is 30 ℃, and the space velocity (GHSV) is 20000h-1. And detecting the content of carbon dioxide in the product by using a gas chromatograph so as to calculate the formaldehyde decomposition efficiency.
TABLE 1 Effect data of catalysts of examples 5-8 and comparative example 1 on the catalytic oxidation of formaldehyde
| Examples | Efficiency of decomposition of formaldehyde |
| Example 5 | 97.8％ |
| Example 6 | 98.9％ |
| Example 7 | 98.3％ |
| Example 8 | 98.1％ |
| Comparative example 1 | 1.2％ |
As can be seen from Table 1, the catalyst provided by the invention can be used for carrying out catalytic oxidative decomposition on formaldehyde at room temperature, the decomposition efficiency is 97.8-98.9%, and the formaldehyde can be efficiently decomposed.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. A catalytically active component comprising manganese dioxide having a lamellar structure and alkali metal ions.
2. The catalytic active component according to claim 1, wherein the mass ratio of the alkali metal ion to the manganese dioxide is 0.2 to 5: 100.
3. A process for the preparation of the catalytically active component according to claim 1 or 2, comprising the steps of:
mixing potassium permanganate, water-soluble divalent manganese salt, alkali metal salt and water for oxidation-reduction reaction to obtain the catalytic active component.
4. The preparation method according to claim 3, wherein the temperature of the oxidation-reduction reaction is 10 to 60 ℃ and the time is 0.5 to 4 hours.
5. The method according to claim 3, further comprising, after the redox reaction:
sequentially carrying out aging and solid-liquid separation on the system after the redox reaction to obtain a solid;
and roasting the solid to obtain the catalytic active component.
6. The preparation method according to claim 5, wherein the aging temperature is 10-60 ℃ and the aging time is 0.5-6 h.
7. The preparation method according to claim 3, wherein the roasting temperature is 120-400 ℃, and the holding time is 2-12 h.
8. The preparation method according to claim 3, wherein the molar ratio of the potassium permanganate to the divalent manganese salt to the alkali metal salt is 10-60: 10-80: 0.1-20.
9. A catalyst comprises the following preparation raw materials in parts by mass:
the catalytic active component is the catalytic active component described in claim 1 or 2 or the catalytic active component prepared by the preparation method described in any one of claims 3 to 8.
10. Use of the catalyst of claim 9 for the catalytic oxidation of formaldehyde.
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