CN111167491B - Method for preparing silicon carbide catalytic film by co-sintering - Google Patents
Method for preparing silicon carbide catalytic film by co-sintering Download PDFInfo
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 57
- 238000005245 sintering Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title abstract description 63
- 229910010271 silicon carbide Inorganic materials 0.000 title abstract description 63
- 239000000843 powder Substances 0.000 claims abstract description 71
- 239000012528 membrane Substances 0.000 claims abstract description 44
- 238000000498 ball milling Methods 0.000 claims abstract description 25
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 20
- 239000002243 precursor Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims abstract description 12
- 229910000018 strontium carbonate Inorganic materials 0.000 claims abstract description 12
- 229910000480 nickel oxide Inorganic materials 0.000 claims abstract description 11
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 11
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims abstract description 11
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011812 mixed powder Substances 0.000 claims description 19
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 13
- 239000000428 dust Substances 0.000 abstract description 12
- 239000012855 volatile organic compound Substances 0.000 abstract description 7
- 239000012071 phase Substances 0.000 abstract description 6
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 3
- 150000004706 metal oxides Chemical class 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000007790 solid phase Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 14
- 239000011148 porous material Substances 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 229910016978 MnOx Inorganic materials 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- 241001085205 Prenanthella exigua Species 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000012621 metal-organic framework Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
The invention relates to a method for preparing a silicon carbide catalytic membrane by co-sintering, which comprises the steps of firstly mixing strontium carbonate, titanium dioxide, ferric oxide, nickel oxide and niobium pentoxide, carrying out ball milling to prepare perovskite precursor powder, then carrying out ball milling and blending on the precursor powder, carbon powder and SiC powder, carrying out in-situ solid phase sintering at high temperature to generate a perovskite phase, bonding SiC particles together by utilizing the generated perovskite, and preparing the SiC separation membrane with catalytic activity in one step. The method utilizes metal oxide in the perovskite raw material as a sintering aid and heat generated by carbon powder combustion, and reduces the sintering temperature of SiC. The prepared SiC catalytic membrane can simultaneously intercept dust and degrade nitrogen oxides and VOCs, and is suitable for the field of atmospheric pollution treatment.
Description
Technical Field
The invention belongs to the field of atmospheric pollution treatment, and particularly relates to a method for preparing a SiC catalytic film by co-sintering.
Background
The industrial tail gas mainly contains ultrafine dust and Nitrogen Oxide (NO) x ) And pollutants such as Volatile Organic Compounds (VOCs) and the like, and industrial tail gas needs to be deeply treated to reach the ultralow emission standard. The dust removal and catalytic degradation of harmful components in the existing industrial tail gas purification systems are completed by independent operation units, which causes high equipment investment and high running cost. If a multifunctional filtering material such as a catalytic membrane can be developed, dust removal, denitration and VOCs removal can be realized simultaneously in one operation unit, so that the industrial tail gas pollutant removal process is greatly simplified, and the method has important significance for air pollution treatment.
Catalytic membranes for gas purification have been studied. Chinese invention patent CN109224874A reports a catalytic membrane supporting MnOx on different membrane materials. The prepared catalytic membrane has large specific surface area and can react with NO at low temperature x The catalyst has excellent catalytic activity and better dust interception performance; chinese invention patent CN108404687A reports that a carbon nano tube and a carbon wire are loaded on a membrane material firstly, a multi-layer structure is constructed, and then a catalytic membrane of a metal organic framework is coated on the membrane material, and the catalytic membrane can realize the high-efficiency adsorption and purification of ultrafine dust and specific polluted gas; chinese invention patent CN104906946A reports a catalytic membrane which modifies the pore channel of a ceramic membrane by using metal alkoxide precursor sol and then loads a catalyst, and the catalytic membrane can effectively remove gas pollutants while intercepting particle pollutants. Although the catalytic membranes can effectively retain dust and degrade specific gas pollutants, the preparation of the catalytic membranes is generally complicated and the preparation cost is high.
Disclosure of Invention
The invention aims to prepare the SiC catalytic membrane in one step, solve the problems of complex preparation process, long working procedure and the like of the SiC catalytic membrane, and apply the prepared SiC catalytic membrane to the removal of ultrafine dust of industrial tail gas and the efficient degradation of NOx and VOCs.
The invention is realized by the following technical scheme:
a method for preparing a SiC catalytic film by co-sintering comprises the following steps:
(1) weighing metal carbonate and oxide powder with a certain molar ratio and a certain particle size, mixing the metal carbonate and oxide powder with an absolute ethanol solution, placing the mixture into a ball milling tank, carrying out ball milling and stirring for a certain time at a certain rotating speed, and drying to obtain perovskite precursor powder;
(2) firstly mixing perovskite precursor powder, SiC powder with a certain particle size and carbon powder according to a certain metering ratio, and then ball-milling and blending for a certain time at a certain rotating speed;
(3) screening the ball-milled powder material by using a 50-60 mesh sieve to obtain mixed powder with a certain particle size;
(4) adding a binder, mixing and stirring the mixture with the mixed powder, extruding and molding the mixture, and sintering the mixture to obtain the SiC catalytic membrane.
Further:
the metal carbonate and oxide powder with certain particle size used in the step (1) are respectively strontium carbonate (particle size: 300-500 nm), titanium dioxide (particle size: 20-30 nm), ferric oxide (particle size: 20-30 nm), nickel oxide (particle size: 30-60 nm) and niobium pentoxide (particle size: 40-70 nm); wherein the ratio of strontium carbonate: titanium dioxide: iron sesquioxide: nickel oxide: niobium pentoxide molar ratio = 1: (0.5-0.65): (0.15-0.2): (0.15-0.2): (0.05-0.1); the setting rotating speed of the ball mill is 200-300 r/min, the ball milling time is 2-4 h, and the drying temperature is 60-100 ℃.
The SiC powder selected in the step (2) has the average grain diameter of 200 mu m, and the carbon powder has the average grain diameter of 20 mu m; the mass ratios used were: perovskite precursor powder: carbon powder: SiC powder = 1: (1.67-2.5): (5.67-9); the ball milling speed is 200-300 r/min, and the ball milling time is 2-4 h.
The binder used in the step (4) is a polyvinyl alcohol (PVA) solution with the mass percent of 6-8%, and the mass ratio of the used amount to the SiC powder is 1 (9-19).
The calcining procedure of the step (4) is as follows: raising the temperature from room temperature to 500-600 ℃ at a heating rate of 1-3 ℃/min, preserving the heat for 2-4 h, then raising the temperature to 1280-1320 ℃ at a heating rate of 1-3 ℃/min, preserving the heat for 2-4 h, and finally naturally cooling.
The SiC catalytic film prepared by co-sintering can be used for deep treatment of industrial tail gas pollutants.
The invention has the beneficial effects that:
1. by utilizing the chemical inertia of SiC, the metal oxide and the strontium carbonate preferentially generate solid phase reaction at high temperature to form perovskite SrTiFeNiNbO 3 The formed perovskite phase flows to the SiC grain boundary through solid phase diffusion to form neck connection, and the SiC catalytic membrane is endowed with high mechanical strength and gas permeability. In addition, the perovskite produced has better catalytic activity due to the existence of B site catalytic active components of Ti, Fe, Ni and Nb.
2. The metal oxide powder in the perovskite raw material is used as a sintering aid to obviously reduce the sintering temperature of the SiC catalytic membrane. The added carbon powder is combusted at 500-600 ℃, so that a pore structure is formed, and the sintering temperature of the pure perovskite phase can be reduced by 40 ℃ by the generated heat, so that the sintering temperature of the SiC catalytic membrane is further reduced.
3. The SiC catalytic membrane is prepared by a one-step method, so that the steps of loading, drying, calcining and the like of the catalyst are omitted, and the preparation time and the energy consumption are saved.
4. The prepared SiC catalytic membrane can simultaneously intercept dust and degrade nitrogen oxides and VOCs, and has wide application prospect in the field of gas purification.
Drawings
FIG. 1 is an SEM image of a SiC catalytic membrane prepared as described in example 1;
FIG. 2 is an EDX diagram of a SiC catalytic membrane prepared as described in example 1;
FIG. 3 is an XRD pattern of a SiC catalytic film prepared as described in example 2;
fig. 4 is a graph of the pore size distribution of the SiC catalytic membrane prepared as described in example 2.
Detailed Description
The present invention is explained in further detail below with reference to examples, which are only for illustrating the present invention, but the embodiments of the present invention are not limited thereto.
Example 1
The preparation method of the co-sintering SiC catalytic film of the embodiment comprises the following preparation steps:
(1) The powder with corresponding mass is weighed according to the mol ratio of strontium carbonate, titanium dioxide, ferric oxide, nickel oxide and niobium pentoxide of 1: 0.65: 0.15: 0.05. And pouring the weighed powder into a ball milling tank, adding an ethanol solution to submerge the powder, and then carrying out ball milling for 4 hours at the rotating speed of 200 revolutions per minute. Drying at 60 ℃ to obtain perovskite precursor powder.
(2) Weighing powder with corresponding mass according to the mass ratio of 1: 2: 7 of the perovskite precursor powder, the carbon powder and the SiC powder, pouring the powder into a ball milling tank, and carrying out ball milling for 4 hours at the rotating speed of 200 r/min.
(3) And pouring out the ball-milled powder, and screening by using a 50-mesh screen.
(4) Weighing 6 wt.% of PVA solution according to the mass ratio of the PVA to the SiC mixed powder of 1: 19. Then, the mixed powder was molded under 8MPa for 20 seconds.
(5) And (3) placing the formed mixed powder in a muffle furnace, heating to 500 ℃ at 1 ℃/min from room temperature, preserving heat for 2h, then heating to 1280 ℃ at 1 ℃/min, preserving heat for 2h, and finally naturally cooling to obtain the SiC catalytic membrane.
Fig. 1 is an SEM image of the SiC catalytic film prepared. The black part is SiC particles and the bright white part is a perovskite phase. Fig. 2 is an EDX diagram of a SiC catalytic membrane. The perovskite phase is generated at the boundary of the SiC particles and the particles, and the generated perovskite phase is used as a binder to connect the SiC particles together to form a neck connection, so that the bending strength of the SiC is enhanced, and the SiC membrane is endowed with catalytic performance.
Example 2
(1) The powder with corresponding mass is weighed according to the mol ratio of strontium carbonate, titanium dioxide, ferric oxide, nickel oxide and niobium pentoxide of 1: 0.65: 0.15: 0.05. The weighed powder was poured into a ball mill pot while adding an ethanol solution and making it over the powder, and then ball milled at 250 rpm for 3 hours. Drying at 60 ℃ to obtain perovskite precursor powder.
(2) Weighing powder with corresponding mass according to the mass ratio of 1: 2.5: 9 of perovskite precursor powder, carbon powder and SiC powder, pouring the powder into a ball milling tank, and carrying out ball milling for 3h at the rotating speed of 250 r/min.
(3) The ball milled powder was poured out and sieved through a 60 mesh sieve.
(4) According to the mass ratio of PVA to SiC mixed powder of 1: 19 weigh 6 wt.% PVA solution. Then, the mixed powder was molded under 10MPa for 15 seconds.
(5) And (3) placing the formed mixed powder in a muffle furnace, heating to 500 ℃ at the room temperature at the speed of 2 ℃/min, preserving heat for 3h, heating to 1280 ℃ at the speed of 1 ℃/min, preserving heat for 2h, and finally naturally cooling to obtain the SiC catalytic membrane.
Fig. 3 is an XRD pattern of the SiC catalytic film prepared as described in example 2, the prepared SiC catalytic film having the same peak as the SiC standard peak, showing that SiC maintains its crystal structure after the co-sintering is completed. FIG. 4 is a graph showing the distribution of pore diameters of the SiC catalytic membrane prepared as described in example 2, and the average pore diameter thereof was 34 μm. Because the SiC pore channel structure is well reserved and has larger pore channel diameter after calcination, the gas flux is 1193.87 m 3· m -2 ·h -1 ·KPa -1 The porosity was 48%.
Example 3
(1) The powder with the corresponding mass is weighed according to the mol ratio of the strontium carbonate, the titanium dioxide, the ferric oxide, the nickel oxide and the niobium pentoxide of 1: 0.6: 0.15: 0.1. The weighed powder was poured into a ball mill pot while adding an ethanol solution and making it over the powder, and then ball milled at 300 rpm for 2 hours. Drying at 80 ℃ to obtain perovskite precursor powder.
(2) Weighing powder with corresponding mass according to the mass ratio of 1: 2.5: 9 of perovskite precursor powder, carbon powder and SiC powder, pouring the powder into a ball milling tank, and carrying out ball milling for 3h at the rotating speed of 300 r/min.
(3) The ball milled powder was poured out and sieved through a 60 mesh sieve.
(4) According to the mass ratio of PVA to SiC mixed powder of 1: 11.5 weigh 7 wt.% PVA solution. Then, the mixed powder was molded under 10MPa for 20 seconds.
(5) And (3) placing the formed mixed powder in a muffle furnace, heating to 550 ℃ at 3 ℃/min from room temperature, preserving heat for 3h, then heating to 1300 ℃ at 2 ℃/min, preserving heat for 3h, and finally naturally cooling to obtain the SiC catalytic membrane.
The prepared SiC catalytic membrane has good mechanical strength (22 MPa), has good dust retention rate of about 99.9 percent, and can maintain low pressure drop (561 Pa).
Example 4
(1) The powder with the corresponding mass is weighed according to the mol ratio of the strontium carbonate, the titanium dioxide, the ferric oxide, the nickel oxide and the niobium pentoxide of 1: 0.6: 0.15: 0.1. The weighed powder was poured into a ball mill pot while adding an ethanol solution and making it over the powder, and then ball milled at 300 rpm for 3 hours. Drying at 80 ℃ to obtain perovskite precursor powder.
(2) Weighing powder with corresponding mass according to the mass ratio of 1: 1.67: 5.67 of perovskite precursor powder, carbon powder and SiC powder, pouring the powder into a ball milling tank, and carrying out ball milling for 2 hours at the rotating speed of 300 r/min.
(3) The ball milled powder was poured out and sieved through a 60 mesh sieve.
(4) According to the mass ratio of PVA to SiC mixed powder of 1: 9 weigh 8 wt.% PVA solution. Then, the mixed powder was molded under a pressure of 12MPa for 10 seconds.
(5) And (3) placing the formed mixed powder in a muffle furnace, heating to 600 ℃ from room temperature at a speed of 1 ℃/min, preserving heat for 2h, heating to 1300 ℃ at a speed of 3 ℃/min, preserving heat for 4h, and finally naturally cooling to obtain the SiC catalytic membrane.
At 500 ppm toluene (typical VOCs gas), 10.5% O 2 The degradation rate of the prepared SiC catalytic membrane to toluene reaches 98%, and the prepared SiC catalytic membrane has high retention rate (99.9%) to dust.
Example 5
(1) The powder with the corresponding mass is weighed according to the mol ratio of the strontium carbonate, the titanium dioxide, the ferric oxide, the nickel oxide and the niobium pentoxide of 1: 0.5: 0.2: 0.1. The weighed powder was poured into a ball mill pot while adding an ethanol solution and making it over the powder, and then ball milled at 200 rpm for 4 hours. Drying at 100 ℃ to obtain perovskite precursor powder.
(2) Weighing powder with corresponding mass according to the mass ratio of 1: 1.67: 5.67 of perovskite precursor powder, carbon powder and SiC powder, pouring the powder into a ball milling tank, and carrying out ball milling for 2 hours at the rotating speed of 300 r/min.
(3) The ball milled powder was poured out and sieved through a 60 mesh sieve.
(4) According to the mass ratio of PVA to SiC mixed powder of 1: 9 weigh 8 wt.% PVA solution. Then, the mixed powder was molded under a pressure of 12MPa for 10 seconds.
(5) And (3) placing the formed mixed powder in a muffle furnace, heating to 600 ℃ from room temperature at a speed of 2 ℃/min, preserving heat for 4h, heating to 1320 ℃ at a speed of 3 ℃/min, preserving heat for 4h, and finally naturally cooling to obtain the SiC catalytic membrane.
At 300ppm NO, 300ppm NH 3 ，8% O 2 Under the condition, the prepared SiC catalytic membrane has good degradation performance (72%) on NOx and good interception performance (99.9%) on dust.
Claims (5)
1. A method for preparing a SiC catalytic film by co-sintering is characterized by comprising the following preparation steps:
(1) weighing metal carbonate and oxide powder with a certain molar ratio and a certain particle size, mixing the metal carbonate and oxide powder with an absolute ethanol solution, placing the mixture into a ball milling tank, carrying out ball milling and stirring for a certain time at a certain rotating speed, and drying to obtain perovskite precursor powder;
(2) firstly mixing perovskite precursor powder, SiC powder with a certain particle size and carbon powder according to a certain metering ratio, and then ball-milling and blending for a certain time at a certain rotating speed;
(3) screening the ball-milled powder material by using a 50-60 mesh sieve to obtain mixed powder with a certain particle size;
(4) adding a binder, mixing and stirring the mixture with the mixed powder, extruding and molding the mixture, and sintering the mixture to obtain the SiC catalytic membrane;
wherein: the metal carbonate in the step (1) is strontium carbonate, and the oxide powder is respectively titanium dioxide, ferric oxide, nickel oxide and niobium pentoxide;
the sintering procedure of the step (4) is as follows: raising the temperature from room temperature to 500-600 ℃ at a heating rate of 1-3 ℃/min, preserving the heat for 2-4 h, then raising the temperature to 1280-1320 ℃ at a heating rate of 1-3 ℃/min, preserving the heat for 2-4 h, and finally naturally cooling.
2. The method for preparing the SiC catalytic membrane by co-sintering as claimed in claim 1, wherein the grain size of strontium carbonate is 300-500 nm, the grain size of titanium dioxide is 20-30 nm, the grain size of ferric oxide is 20-30 nm, the grain size of nickel oxide is 30-60 nm, and the grain size of niobium pentoxide is 40-70 nm; wherein the ratio of strontium carbonate: titanium dioxide: iron sesquioxide: nickel oxide: niobium pentoxide molar ratio = 1: (0.5-0.65): (0.15-0.2): (0.15-0.2): (0.05-0.1); the ball mill is set to rotate at a speed of 200-300 revolutions per minute for 2-4 hours, and the drying temperature is 60-100 ℃.
3. The method for preparing the SiC catalytic film by co-sintering according to claim 1, wherein the SiC powder selected in the step (2) has an average particle size of 200 μm and the carbon powder has an average particle size of 20 μm; the mass ratios used were: perovskite precursor powder: carbon powder: SiC powder = 1: (1.67-2.5): (5.67-9); the ball milling speed is 200-300 r/min, and the ball milling time is 2-4 h.
4. The method for preparing the SiC catalytic membrane through co-sintering according to claim 1, wherein the binder used in the step (4) is a polyvinyl alcohol (PVA) solution with a mass percent of 6-8%, and the mass ratio of the used amount to the SiC powder is 1 (9-19).
5. The use of the SiC catalytic film prepared by the method of any one of claims 1 to 4 in the field of atmospheric pollution abatement.
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