CN112717943A - Nitric oxide oxidation catalyst and preparation method thereof - Google Patents
Nitric oxide oxidation catalyst and preparation method thereof Download PDFInfo
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 230000003647 oxidation Effects 0.000 title claims abstract description 28
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 45
- 150000003839 salts Chemical class 0.000 claims abstract description 43
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical group [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000008139 complexing agent Substances 0.000 claims abstract description 11
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical group [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims abstract description 10
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical group [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 9
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 9
- 229910002254 LaCoO3 Inorganic materials 0.000 claims abstract description 7
- 230000003197 catalytic effect Effects 0.000 claims abstract description 6
- 239000012266 salt solution Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000002243 precursor Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 2
- 229910000510 noble metal Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000004056 waste incineration Methods 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000011865 Pt-based catalyst Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
-
- 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
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
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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
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/036—Precipitation; Co-precipitation to form a gel or a cogel
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/088—Decomposition of a metal salt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
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- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
- B01D2258/0291—Flue gases from waste incineration plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Abstract
The invention discloses a nitric oxide oxidation catalyst, which is prepared from salt A, salt A ', salt B and a citric acid complexing agent, wherein the molar mass ratio of the total amount of the salt A and the salt A' to the salt B is 1:1, wherein the proportion of the A ' salt in the total amount of the A salt and the A ' salt is 0-0.6, the A salt is lanthanum nitrate, the A ' salt is potassium nitrate, and the B salt is cobalt nitrate. The invention has the advantages that: on the basis of LaCoO3, the oxidation capability of the compound on nitric oxide is improved by partially substituting K for La; the structure is stable, the thermal stability is excellent, the service life is long, and the high catalytic activity can be maintained for a long time; the catalyst is low in use price, and is suitable for tail gas denitration of coal-fired power plants, tail gas treatment of waste incineration boilers, automobile tail gas treatment and some chemical plants; compared with noble metal catalysts, the catalyst has the characteristics of low price, stable structure, good catalytic activity, stable thermodynamic performance at high temperature and the like, and has a higher application prospect in the field of atmospheric pollution control.
Description
Technical Field
The invention relates to a nitric oxide oxidation catalyst and a preparation method thereof, belonging to the field of atmospheric pollution control.
Background
Nitrogen oxide is a common atmospheric pollutant, and can cause a series of environmental problems such as photochemical smog, acid rain, ozone cavity, greenhouse effect and the like. The method is often generated from the combustion of fossil fuel and the emission of motor vehicle exhaust, wherein nitrogen oxides generated by the combustion of the fossil fuel are taken as main components, and nitric oxide accounts for 90-95% of the total content of the nitrogen oxides in the emitted coal-fired flue gas, so that the nitric oxide is the main research target for preventing and controlling the pollution of the nitrogen oxides. At present, the Selective Catalytic Reduction (SCR) technology, which is a mature technology for removing nitrogen oxides, is a Lean-burn NOX Trap (LNT) technology in the aspect of automobile exhaust purification treatment. In both of these technical approaches, the oxidation of NO to NO2 is a critical step in the reaction. When the ratio of NO to NO2 is 1, NOX reduction is most effective in the SCR reaction; in the LNT reaction, NO is more easily stored after oxidation to NO 2. And NO2 has higher water solubility than NO, which is more favorable for later removal. The catalyst for catalytic oxidation of nitric oxide is a Pt-based catalyst, but the catalyst is often expensive to use due to the precious metal Pt. The current viable solution is to find a catalyst that is inexpensive and highly thermally stable to replace the expensive noble metal catalyst.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nitric oxide oxidation catalyst and a preparation method thereof, wherein the nitric oxide oxidation catalyst is prepared by partially replacing La by K on the basis of LaCoO3, so that the nitric oxide oxidation capability of the nitric oxide oxidation catalyst is improved.
The invention is realized by the following scheme: the nitric oxide oxidation catalyst is prepared from an A salt, an A 'salt, a B salt and a citric acid complexing agent, wherein the molar mass ratio of the total amount of the A salt and the A' salt to the B salt is 1:1, wherein the ratio of the A 'salt to the total amount of the A salt and the A' salt is 0 to 0.6.
The salt A is lanthanum nitrate, the salt A' is potassium nitrate, and the salt B is cobalt nitrate.
A process for preparing the nitric oxide oxidizing catalyst in LaCoO3Based on the above, the catalyst for oxidizing nitric oxide is prepared by partially replacing La by K.
A preparation method of a nitric oxide oxidation catalyst comprises the following steps:
step one, adding the total amount of A salt and A' salt and B salt into ultrapure water according to the molar mass of the total ratio of 1:1, and magnetically stirring to form a metal salt solution;
step two, uniformly mixing the metal salt solution obtained in the step one with a citric acid complexing agent to obtain a mixed salt solution;
carrying out ultrasonic treatment on the mixed salt solution obtained in the step two in an ultrasonic cleaning instrument, and then carrying out water bath heating until the nitrate solution forms sol gel; drying in an oven to obtain a perovskite precursor;
step four, placing the perovskite precursor obtained in the step three into a muffle furnace for roasting, and then naturally cooling to room temperature; and finally, grinding and tabletting the sample to obtain the finished perovskite catalyst with the granularity of 40-60 meshes.
And adding a citric acid complexing agent according to the molar ratio of the total metal ions to the citric acid of 1:2 in the second step.
The ultrasonic treatment time in the third step is 30-60 min.
The temperature of water bath heating in the third step is 70-80 ℃.
The drying temperature in the oven in the third step is 110-120 ℃, and the drying time is 12 h.
In the fourth step, the roasting temperature of the perovskite precursor in a muffle furnace is 700 ℃, the roasting time is 5h, wherein the roasting temperature in the muffle furnace is uniformly increased to 700 ℃ at a temperature increase rate of 5-10 ℃/min.
The invention has the beneficial effects that:
1. according to the invention, on the basis of LaCoO3, La is partially substituted by K, so that the nitric oxide oxidizing capability of the catalyst is improved;
2. the perovskite catalyst has the advantages of stable structure, excellent thermal stability, long service life and capability of keeping higher catalytic activity for a long time;
3. the perovskite catalyst prepared by the method is low in use price, and is suitable for tail gas denitration of coal-fired power plants, tail gas treatment of waste incineration boilers, automobile tail gas treatment and some chemical plants;
4. compared with a noble metal catalyst, the perovskite catalyst has the characteristics of low price, stable structure, good catalytic activity, stable thermodynamic performance at high temperature and the like, and has a higher application prospect in the field of atmospheric pollution control.
Drawings
Fig. 1 is an XRD pattern of La1-xKxCoO3(X ═ 0-0.6) perovskite catalyst.
Fig. 2 is a curve of conversion rate of the perovskite catalyzed oxidation of nitric oxide versus temperature change of La1-xKxCoO3(X ═ 0-0.6).
Detailed Description
The invention is further described below with reference to fig. 1-2, without limiting the scope of the invention.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development effort might be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
Example 1: the perovskite catalyst of this example was LaCoO3, which was performed according to the following procedure:
step one, lanthanum nitrate and cobalt nitrate are added into ultrapure water according to the molar mass ratio of 1:1, and are magnetically stirred to form a metal salt solution;
step two, uniformly mixing the metal salt solution obtained in the step one with a citric acid complexing agent to obtain a mixed salt solution, wherein the citric acid complexing agent is added according to the molar ratio of the total metal ions to the citric acid of 1: 2;
carrying out ultrasonic treatment on the mixed salt solution obtained in the step two in an ultrasonic cleaning instrument for 60min, then heating the mixed salt solution in a water bath at the water bath temperature of 80 ℃ until the nitrate solution forms sol gel, and then drying the sol gel in a drying oven at the temperature of 110 ℃ for 12h to obtain a perovskite precursor;
and step four, placing the perovskite precursor obtained in the step three in a muffle furnace, uniformly heating to 700 ℃ at a heating rate of 5 ℃/min, roasting for 5h, and then naturally cooling to room temperature. And finally, grinding and tabletting the sample to obtain a finished product of LaCoO3 perovskite catalyst with the granularity of 40-60 meshes.
Example 2: the perovskite catalyst of the present example was La0.9K0.1CoO3; the method comprises the following steps:
step one, lanthanum nitrate, potassium nitrate and cobalt nitrate are added into ultrapure water according to the molar mass ratio of 0.9:0.1:1, and are magnetically stirred to form a metal salt solution;
step two, uniformly mixing the metal salt solution obtained in the step one with a citric acid complexing agent to obtain a mixed salt solution, wherein the citric acid complexing agent is added according to the molar ratio of the total metal ions to the citric acid of 1: 2;
carrying out ultrasonic treatment on the mixed salt solution obtained in the step two in an ultrasonic cleaning instrument for 30min, then heating the mixed salt solution in a water bath at the water bath temperature of 80 ℃ until the nitrate solution forms sol gel, and then drying the sol gel in a drying oven at the temperature of 110 ℃ for 12h to obtain a perovskite precursor;
and step four, placing the perovskite precursor obtained in the step three in a muffle furnace, uniformly heating to 700 ℃ at a heating rate of 5 ℃/min, roasting for 5 hours, and then naturally cooling to room temperature. And finally, grinding and tabletting the sample to obtain a finished La0.9K0.1CoO3 perovskite catalyst with the granularity of 40-60 meshes.
Example 3: the perovskite catalyst of the embodiment is La0.8K0.2CoO3;
example 3 was compared to example 2 except that lanthanum nitrate, potassium nitrate and cobalt nitrate were weighed at a molar mass ratio of 0.8:0.2:1, the other operating conditions and material usage were the same as in example 2, and the final product, la0.8k0.2coo3 perovskite catalyst, was obtained.
Example 4: the perovskite catalyst of the present example was la0.7k0.3coo3; example 4 was compared with example 2, except that lanthanum nitrate, potassium nitrate and cobalt nitrate were weighed in a molar mass ratio of 0.7:0.3:1, and other operating conditions and material amounts were the same as in example 2, to finally obtain a final la0.7k0.3coo3 perovskite catalyst.
Example 5: the perovskite catalyst of the embodiment is La0.6K0.4CoO3; example 5 was compared to example 2 except that lanthanum nitrate, potassium nitrate and cobalt nitrate were weighed at a molar mass ratio of 0.6:0.4:1, other operating conditions and material usage were the same as in example 2, and a finished la0.6k0.4coo3 perovskite catalyst was obtained.
Example 6: the perovskite catalyst of the present example was la0.5k0.5coo3; example 6 was compared to example 2 except that lanthanum nitrate, potassium nitrate and cobalt nitrate were weighed at a molar mass ratio of 0.5:0.5:1, the other operating conditions and the amounts of materials used were the same as in example 2, and the final product, la0.5k0.5coo3 perovskite catalyst, was obtained.
Example 7: the perovskite catalyst of the embodiment is La0.4K0.6CoO3; example 7 was compared with example 2 except that lanthanum nitrate, potassium nitrate and cobalt nitrate were weighed at a molar mass ratio of 0.4:0.6:1, and other operating conditions and material amounts were the same as in example 2, to give a final la0.7k0.3coo3 perovskite catalyst.
The XRD patterns of the K-substituted perovskite catalysts prepared in examples 1 to 7 are shown in fig. 1, from which it is clear that all the examples show distinct perovskite characteristic peaks, but as the substitution amount of K increases, a characteristic peak of Co4O3 appears at 36.9 ° 2 θ, demonstrating that as K is substituted, Co in the perovskite is converted to Co4O 3.
Test example:
the fresh catalyst was packed in a quartz tube, and first purged with nitrogen at 100 ℃ for 1 hour, and then heated from 100 ℃ to 400 ℃ with the sampling point time controlled at 10min, and the nitrogen monoxide oxidation rate was as shown in table 1.
TABLE 1 La1-xKxCoO3(X ═ 0-0.6) perovskite catalyzed oxidation nitrogen monoxide oxidation rate.
The invention is applied to the reaction of catalyzing and oxidizing nitric oxide, and the specific reaction conditions are as follows: the total flow of gas distribution is 600mL/min, the concentration of NO is 500ppm, the oxygen content is 10 percent, the carrier gas is nitrogen, the temperature of the gas mixing tank is 200 ℃, and the space velocity is 50000h-1The experimental temperature condition is 100-400 ℃.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (10)
1. A nitric oxide oxidation catalyst, characterized by: the salt is prepared from a salt A, a salt A ', a salt B and a citric acid complexing agent, wherein the molar mass ratio of the total amount of the salt A and the salt A' to the salt B is 1:1, wherein the ratio of the A 'salt to the total amount of the A salt and the A' salt is 0 to 0.6.
2. A nitric oxide oxidation catalyst as claimed in claim 1, wherein: the salt A is lanthanum nitrate, the salt A' is potassium nitrate, and the salt B is cobalt nitrate.
3. A preparation method of a nitric oxide oxidation catalyst is characterized by comprising the following steps: in LaCoO3Based on the above, the catalyst for oxidizing nitric oxide is prepared by partially replacing La by K.
4. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 3, wherein: the method comprises the following steps:
step one, adding the total amount of A salt and A' salt and B salt into ultrapure water according to the molar mass of the total ratio of 1:1, and magnetically stirring to form a metal salt solution;
step two, uniformly mixing the metal salt solution obtained in the step one with a citric acid complexing agent to obtain a mixed salt solution;
carrying out ultrasonic treatment on the mixed salt solution obtained in the step two in an ultrasonic cleaning instrument, and then carrying out water bath heating until the nitrate solution forms sol gel; drying in an oven to obtain a perovskite precursor;
step four, placing the perovskite precursor obtained in the step three into a muffle furnace for roasting, and then naturally cooling to room temperature; and finally, grinding and tabletting the sample to obtain the finished perovskite catalyst with the granularity of 40-60 meshes.
5. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 4, wherein: and adding a citric acid complexing agent according to the molar ratio of the total metal ions to the citric acid of 1:2 in the second step.
6. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 4, wherein: the ultrasonic treatment time in the third step is 30-60 min.
7. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 4, wherein: the temperature of water bath heating in the third step is 70-80 ℃.
8. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 4, wherein: the drying temperature in the oven in the third step is 110-120 ℃, and the drying time is 12 h.
9. A method for producing a nitrogen monoxide oxidation catalyst as recited in claim 4, wherein: in the fourth step, the roasting temperature of the perovskite precursor in a muffle furnace is 700 ℃, the roasting time is 5h, wherein the roasting temperature in the muffle furnace is uniformly increased to 700 ℃ at a temperature increase rate of 5-10 ℃/min.
10. Use of a perovskite catalyst according to claim 4 for the catalytic oxidation of nitric oxide.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5879645A (en) * | 1994-11-03 | 1999-03-09 | Korea Research Institute Of Chemical Technology | Method for removing nitrogen oxides in exhaust gas by selective catalytic reduction and catalyst for reduction of nitrogen oxides |
| CN102500396A (en) * | 2011-11-17 | 2012-06-20 | 四川中自尾气净化有限公司 | Perovskite type oxide catalyst and preparation method thereof |
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