CN110918118A - Catalyst for purifying waste gas and preparation method thereof - Google Patents
Catalyst for purifying waste gas and preparation method thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 44
- 239000002912 waste gas Substances 0.000 title abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 42
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 39
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 38
- 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 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000002844 melting Methods 0.000 claims abstract description 31
- 230000008018 melting Effects 0.000 claims abstract description 31
- 239000011812 mixed powder Substances 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 27
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims abstract description 25
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 23
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 23
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 23
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000010457 zeolite Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- ZWOQODLNWUDJFT-UHFFFAOYSA-N aluminum lanthanum Chemical compound [Al].[La] ZWOQODLNWUDJFT-UHFFFAOYSA-N 0.000 claims abstract description 21
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 21
- 229910052809 inorganic oxide Inorganic materials 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 21
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 19
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 19
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 19
- 239000010948 rhodium Substances 0.000 claims abstract description 19
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims description 50
- 238000009713 electroplating Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 12
- 238000010309 melting process Methods 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000000746 purification Methods 0.000 description 4
- 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
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- B01J29/48—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/78—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J29/7815—Zeolite Beta
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0036—Grinding
-
- 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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a catalyst for purifying waste gas and a preparation method thereof, wherein the catalyst comprises the following raw materials in parts by weight: 100-120 parts of aluminum oxide, 15-23 parts of rare earth metal oxide, 15-18 parts of aluminum lanthanum composite oxide, 5-10 parts of active metal platinum, 3-5 parts of palladium, 1-3 parts of rhodium, 5-10 parts of magnesium oxide, 5-10 parts of refractory inorganic oxide, 15-25 parts of zeolite, 20-30 parts of titanium dioxide, 2-5 parts of ammonium metavanadate, 1-5 parts of copper-manganese composite, 1-5 parts of cerium nitrate, 15-20 parts of graphite, 5-8 parts of tungsten powder and 200-1000 parts of nitrogen, putting the mixed powder A into a smelting furnace, keeping the melting temperature unchanged after high-temperature heating and melting, continuously smelting for 1-2 hours, and mixing and stirring at the rotating speed of 500-600 r/min in the smelting process to obtain a mixed liquid B. The invention has good catalytic effect and long service life, and is suitable for popularization.
Description
Technical Field
The invention relates to the technical field of catalysts for waste gas purification, in particular to a catalyst for waste gas purification and a preparation method thereof.
Background
Nitrogen oxide (NOx) is one of the main atmospheric pollutants, and is also the main precursor for forming photochemical smog, and controlling and treating the pollution of nitrogen oxide is always a research hotspot in the international environmental protection field. NOx in motor vehicle exhaust has become a major source of pollution in today's urban air pollution. In recent years, as the share of diesel vehicles in automobiles is increasing, the control of pollutants discharged by diesel vehicles in various countries is becoming stricter, the requirements of future emission regulations are difficult to be met only by built-in measures, and corresponding post-treatment technologies are required to be adopted. At present, the catalyst is a honeycomb cordierite or metal material as a carrier, and one or more oxides of V, Ti, W and the like are loaded, but the gas flow of the honeycomb cordierite or metal material carrier is mainly in a direct current form in the process of passing exhaust gas, and simultaneously, the service life of the catalyst is easily influenced due to poor heat-conducting property of the honeycomb cordierite and high gas temperature in the exhaust process.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an exhaust gas purification catalyst and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a catalyst for purifying exhaust gas comprises the following raw materials in parts by weight: 100-120 parts of aluminum oxide, 15-23 parts of rare earth metal oxide, 15-18 parts of aluminum lanthanum composite oxide, 5-10 parts of active metal platinum, 3-5 parts of palladium, 1-3 parts of rhodium, 5-10 parts of magnesium oxide, 5-10 parts of refractory inorganic oxide, 15-25 parts of zeolite, 20-30 parts of titanium dioxide, 2-5 parts of ammonium metavanadate, 1-5 parts of copper-manganese composite, 1-5 parts of cerium nitrate, 15-20 parts of graphite, 5-8 parts of tungsten powder and 200-1000 parts of nitrogen.
Preferably, the zeolite is one or both of the ZSM-5 and β -types.
Preferably, the feed comprises the following raw materials in parts by weight: 105-115 parts of aluminum oxide, 16-22 parts of rare earth metal oxide, 16-17 parts of aluminum lanthanum composite oxide, 6-9 parts of active metal platinum, 3.5-4.5 parts of palladium, 1.2-2.8 parts of rhodium, 6-9 parts of magnesium oxide, 6-9 parts of refractory inorganic oxide, 16-24 parts of zeolite, 22-28 parts of titanium dioxide, 2.5-4.5 parts of ammonium metavanadate, 1.5-4.5 parts of copper-manganese compound, 1.5-4.5 parts of cerium nitrate, 16-19 parts of graphite, 5.5-7.5 parts of tungsten powder and 300-900 parts of nitrogen.
Preferably, the feed comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
Preferably, the rare earth metal oxide is an oxide of cerium.
Preferably, the weight ratio of the aluminum oxide to the rare earth metal oxide to the aluminum lanthanum composite oxide to the active metal platinum is 12-15: 2.2-3.8: 2-4: 1.
preferably, the weight ratio of the refractory inorganic oxide to the zeolite to the titanium dioxide to the ammonium metavanadate to the copper-manganese composite is 1: 2-3: 3-4: 0.3-0.5: 0.2 to 0.4.
A method for producing a catalyst for exhaust gas purification, comprising the steps of,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1-2 hours, and mixing and stirring at the rotating speed of 500-600 r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 200-400 r/min in the whole heating and melting process, stirring for 1-2 h, adding nitrogen, and increasing the rotating speed to 400-600 r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 550-820 ℃, forging, tempering, quenching, taking out the casting D, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
Preferably, in S2, the mixed powder a is put into a smelting furnace, and after being heated and melted at a high temperature, the melting temperature is kept unchanged, and smelting is continued for 1.5 hours, and during the smelting process, the mixed powder a is mixed and stirred at a rotation speed of 550r/min to obtain a mixed liquid B.
Preferably, in S3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotation speed of 300r/min in the whole heating and melting process, stirring for 1.5h, adding nitrogen, and increasing the rotation speed to 500r/min to obtain the mixed liquid C.
According to the catalyst for purifying the waste gas, the raw materials such as graphite and tungsten powder are added, so that the stability of the catalyst can be improved, the heat resistance of the whole catalyst can be improved by adding the tungsten powder, the preparation method of the catalyst for purifying the waste gas is further provided, the mixed powder ammonium metavanadate is added into the mixed liquid B, after heating and melting are carried out, the whole heating and melting process is stirred and mixed at the rotating speed of 200-400 r/min, nitrogen is added after stirring is carried out for 1-2 h, the rotating speed is increased to 400-600 r/min, and the mixed liquid C is obtained.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
The invention provides a catalyst for purifying waste gas, which comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
The invention provides a preparation method of a catalyst for purifying waste gas, which comprises the following steps,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1h, and mixing and stirring at the rotating speed of 500r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 200r/min in the whole heating and melting process, stirring for 1h, adding nitrogen, and increasing the rotating speed to 400r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 550 ℃, forging, tempering and quenching after the casting is finished, taking out the casting D after the casting D is finished, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
Example two
The invention provides a catalyst for purifying waste gas, which comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
The invention provides a preparation method of a catalyst for purifying waste gas, which comprises the following steps,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1.2h, and mixing and stirring at the rotating speed of 530r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 250r/min in the whole heating and melting process, stirring for 1.3h, adding nitrogen, and increasing the rotating speed to 450r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 620 ℃, forging, tempering and quenching after the casting is finished, taking out the casting D after the casting D is finished, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
EXAMPLE III
The invention provides a catalyst for purifying waste gas, which comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
The invention provides a preparation method of a catalyst for purifying waste gas, which comprises the following steps,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1.5h, and mixing and stirring at the rotating speed of 550r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 300r/min in the whole heating and melting process, stirring for 1.5h, adding nitrogen, and increasing the rotating speed to 500r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 650 ℃, forging, tempering and quenching after the casting is finished, taking out the casting D after the casting D is finished, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
Example four
The invention provides a catalyst for purifying waste gas, which comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
The invention provides a preparation method of a catalyst for purifying waste gas, which comprises the following steps,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1.8h, and mixing and stirring at a rotating speed of 580r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing the mixed powder at the rotating speed of 350r/min in the whole heating and melting process, stirring for 1.8h, adding nitrogen, and increasing the rotating speed to 550r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 750 ℃, forging, tempering and quenching after the casting is finished, taking out the casting D after the casting D is finished, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
EXAMPLE five
The invention provides a catalyst for purifying waste gas, which comprises the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
The invention provides a preparation method of a catalyst for purifying waste gas, which comprises the following steps,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 2 hours, and mixing and stirring at the rotating speed of 600r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 400r/min in the whole heating and melting process, stirring for 2 hours, adding nitrogen, and increasing the rotating speed to 600r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 820 ℃, forging, tempering, quenching, taking out the casting D, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
It should be noted that the shape of the mold may be a mesh shape, as in the present state of the filter screen, or a spiral shape, and the specific shape is not limited.
According to the catalyst for purifying the waste gas, the raw materials such as graphite and tungsten powder are added, so that the stability of the catalyst can be improved, the heat resistance of the whole catalyst can be improved by adding the tungsten powder, the preparation method of the catalyst for purifying the waste gas is further provided, the mixed powder ammonium metavanadate is added into the mixed liquid B, after heating and melting are carried out, the whole heating and melting process is stirred and mixed at the rotating speed of 200-400 r/min, nitrogen is added after stirring is carried out for 1-2 h, the rotating speed is increased to 400-600 r/min, and the mixed liquid C is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A catalyst for purifying exhaust gas is characterized by comprising the following raw materials in parts by weight: 100-120 parts of aluminum oxide, 15-23 parts of rare earth metal oxide, 15-18 parts of aluminum lanthanum composite oxide, 5-10 parts of active metal platinum, 3-5 parts of palladium, 1-3 parts of rhodium, 5-10 parts of magnesium oxide, 5-10 parts of refractory inorganic oxide, 15-25 parts of zeolite, 20-30 parts of titanium dioxide, 2-5 parts of ammonium metavanadate, 1-5 parts of copper-manganese composite, 1-5 parts of cerium nitrate, 15-20 parts of graphite, 5-8 parts of tungsten powder and 200-1000 parts of nitrogen.
2. The exhaust gas purifying catalyst according to claim 1, wherein the zeolite is one or both of ZSM-5 and β -type.
3. The exhaust gas purifying catalyst according to claim 1, characterized by comprising the following raw materials in parts by weight: 105-115 parts of aluminum oxide, 16-22 parts of rare earth metal oxide, 16-17 parts of aluminum lanthanum composite oxide, 6-9 parts of active metal platinum, 3.5-4.5 parts of palladium, 1.2-2.8 parts of rhodium, 6-9 parts of magnesium oxide, 6-9 parts of refractory inorganic oxide, 16-24 parts of zeolite, 22-28 parts of titanium dioxide, 2.5-4.5 parts of ammonium metavanadate, 1.5-4.5 parts of copper-manganese compound, 1.5-4.5 parts of cerium nitrate, 16-19 parts of graphite, 5.5-7.5 parts of tungsten powder and 300-900 parts of nitrogen.
4. The exhaust gas purifying catalyst according to claim 1, characterized by comprising the following raw materials in parts by weight: 110 parts of aluminum oxide, 19 parts of rare earth metal oxide, 16.5 parts of aluminum lanthanum composite oxide, 7.5 parts of active metal platinum, 4 parts of palladium, 2 parts of rhodium, 7.5 parts of magnesium oxide, 7.5 parts of refractory inorganic oxide, 20 parts of zeolite, 25 parts of titanium dioxide, 3.5 parts of ammonium metavanadate, 3 parts of copper-manganese compound, 3 parts of cerium nitrate, 17.5 parts of graphite, 6.5 parts of tungsten powder and 650 parts of nitrogen.
5. The exhaust gas-purifying catalyst according to claim 1, wherein the rare earth metal oxide is an oxide of cerium.
6. The exhaust gas-purifying catalyst according to claim 1, wherein the weight ratio of the alumina, the rare earth metal oxide, the aluminum lanthanum composite oxide, and the active metal platinum is 12 to 15: 2.2-3.8: 2-4: 1.
7. the exhaust gas purifying catalyst according to claim 1, wherein the refractory inorganic oxide, zeolite, titanium dioxide, ammonium metavanadate and copper-manganese complex are present in a weight ratio of 1: 2-3: 3-4: 0.3-0.5: 0.2 to 0.4.
8. The production method of an exhaust gas purifying catalyst according to any one of claims 1 to 7, characterized by comprising the steps of,
s1, putting alumina, rare earth metal oxide, aluminum lanthanum composite oxide, active metal platinum, palladium, rhodium, magnesium oxide, refractory inorganic oxide, zeolite, titanium dioxide, copper manganese compound, cerium nitrate, graphite and tungsten powder into a ball mill for grinding, and grinding for later use to obtain mixed powder A;
s2, placing the mixed powder A into a smelting furnace, heating and melting at high temperature, keeping the melting temperature unchanged, continuing smelting for 1-2 hours, and mixing and stirring at the rotating speed of 500-600 r/min in the smelting process to obtain mixed liquid B;
s3, adding the mixed powder ammonium metavanadate into the mixed liquid B, heating and melting, stirring and mixing at a rotating speed of 200-400 r/min in the whole heating and melting process, stirring for 1-2 h, adding nitrogen, and increasing the rotating speed to 400-600 r/min to obtain mixed liquid C;
s4, pouring the mixed liquid C into a mold, casting into a casting, heating the cast casting to 550-820 ℃, forging, tempering, quenching, taking out the casting D, and naturally cooling to obtain the casting D;
s5, electroplating a zinc layer on the surface of the casting D, and electroplating an aluminum layer on the outermost layer to obtain the catalyst E.
9. The method of claim 8, wherein in step S2, the mixed powder A is placed in a melting furnace, after being heated and melted at a high temperature, the melting temperature is kept constant, the melting is continued for 1.5h, and the mixed powder A is mixed and stirred at a rotation speed of 550r/min during the melting process to obtain the mixed liquid B.
10. The method according to claim 8, wherein in step S3, the mixed powder ammonium metavanadate is added to the mixed liquid B, and after heating and melting, the whole heating and melting process is stirred and mixed at a rotation speed of 300r/min, and after stirring for 1.5h, nitrogen is added, and the rotation speed is increased to 500r/min, so as to obtain the mixed liquid C.
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| CN111632621A (en) * | 2020-06-05 | 2020-09-08 | 合肥神舟催化净化器股份有限公司 | Catalyst for purifying waste gas |
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