CN115466973A - Calcium stannate-tin oxide/conductive carbon black nano catalyst and preparation method thereof - Google Patents
Calcium stannate-tin oxide/conductive carbon black nano catalyst and preparation method thereof Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910001887 tin oxide Inorganic materials 0.000 title claims abstract description 26
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 22
- 239000011575 calcium Substances 0.000 title claims abstract description 22
- 239000011943 nanocatalyst Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 42
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000001110 calcium chloride Substances 0.000 claims abstract description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 150000007524 organic acids Chemical class 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000010992 reflux Methods 0.000 claims abstract description 4
- FWPIDFUJEMBDLS-UHFFFAOYSA-L tin(II) chloride dihydrate Chemical compound O.O.Cl[Sn]Cl FWPIDFUJEMBDLS-UHFFFAOYSA-L 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- HNQGTZYKXIXXST-UHFFFAOYSA-N calcium;dioxido(oxo)tin Chemical compound [Ca+2].[O-][Sn]([O-])=O HNQGTZYKXIXXST-UHFFFAOYSA-N 0.000 claims description 13
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 239000002243 precursor Substances 0.000 claims description 8
- 150000003606 tin compounds Chemical class 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 6
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 239000007772 electrode material Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 229910001134 stannide Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 239000002105 nanoparticle Substances 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 241000282326 Felis catus Species 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- -1 H 2 O 2 Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/28—Per-compounds
- C25B1/30—Peroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
- C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
- C25B11/065—Carbon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention provides a calcium stannate-tin oxide/conductive carbon black nano catalyst, which is prepared by the following steps: dissolving calcium chloride, tin dichloride dihydrate and organic acid in hydrogen peroxide to obtain a mixed solution containing stannides; then adding conductive carbon black, adjusting the pH value of the solution to 6-12, and heating and refluxing for 1-10 h at the constant temperature of 50 ℃; and drying and roasting the obtained sol to obtain the catalyst. The invention effectively reduces the roasting temperature in the preparation process of the catalyst, greatly reduces the energy consumption, the environmental pollution and the requirements on production equipment, and also reduces the production cost. The obtained catalyst has the advantages of high dispersibility, small size, high conductivity, high specific surface area and the like. The catalyst can provide more surface unsaturated coordination Sn active centers, has good conductivity, and greatly improves the electrocatalysis performance of two electron water oxidation of the catalyst; meanwhile, the catalyst can be better attached to the electrode material, and the reaction stability is effectively improved.
Description
The technical field is as follows:
the invention relates to the technical field of catalyst preparation, in particular to a calcium stannate-tin oxide/conductive carbon black nano catalyst and a preparation method thereof.
Background art:
with the rapid development of economy in China, the problem of environmental pollution, particularly water pollution, is increasingly prominent. Oxidation treatment of waste water is one of the main sewage treatment processes by using higher oxidation-reduction potential substances, such as H 2 O 2 、Cl 2 、ClO 2 Potassium permanganate, ferrate and the like directly oxidize organic pollutants with reducibility in water into CO 2 . At present, 95% of hydrogen peroxide is produced by the anthraquinone process. The method has the advantages of complex process, serious environmental pollution and high cost, and has certain potential safety hazard in the aspects of storage and transportation of the hydrogen peroxide. The two-electron water oxidation electro-catalysis method (2 e-WOR) directly uses water as a reactant, can produce hydrogen peroxide in sewage in situ, has simple process, environmental protection and low cost, and can effectively solve the problem of safe storage and transportation of hydrogen peroxide.
Currently, 2e-WOR catalysts mainly comprise metal oxides, metalloporphyrins and carbon materials. Among them, calcium stannate is high in H 2 O 2 The selectivity and the lower price become the catalyst with industrial application prospect. However, the current calcium stannate catalysts have three problems: and (1) the roasting temperature of calcium stannate is high. Generally, the roasting temperature in the preparation process of calcium stannate reaches 850-1000 ℃, the requirement on production equipment is high, and a large amount of energy waste and environmental pollution are caused; and (2) the catalyst activity is low. Because the roasting temperature of the catalyst is too high, the particle size of the generated calcium stannate is large, the specific surface area is low, and the electrocatalytic activity of the two-electron water oxidation is low; and (3) the catalyst is easy to fall off and deactivate on the surface of the electrode. The catalyst has large particle size, so the catalyst has small adhesive force on an electrode material and is easy to fall off from the surface of the electrode to be inactivated. In view of the presence of calcium stannate catalysts and the process for their preparationIn view of the above problems, it is necessary to develop a method for preparing tin-based nanoparticles having a small size, high dispersion, high stability and high catalytic efficiency at a low firing temperature.
The invention content is as follows:
the invention aims to provide a calcium stannate-tin oxide/conductive carbon black nano catalyst which has small size, uniform dispersion, high conductivity, high hydrogen peroxide yield and stability and a preparation method thereof. The technical scheme of the invention is as follows:
a preparation method of calcium stannate-tin oxide/conductive carbon black nano catalyst comprises the following steps:
1) Dissolving calcium chloride, tin dichloride dihydrate and organic acid in hydrogen peroxide to obtain a mixed solution containing a tin compound precursor;
2) Adding conductive carbon black into the mixed solution, adjusting the pH value of the solution to 6-12, and then heating and refluxing at the constant temperature of 50 ℃ for 1-10 h to obtain sol;
3) Drying the sol to evaporate water to obtain dry gel;
4) And roasting the xerogel to obtain a catalyst product.
Preferably, the adding amount of the conductive carbon black in the mixed solution in the step 2) refers to the following ratio: the mass ratio of the tin compound precursor to the conductive carbon black in the mixed solution is 1-8; the specific surface area of the conductive carbon black is 100-2000 m 2 /g。
Preferably, the organic acid in step 1) is oxalic acid or citric acid.
Preferably, the roasting treatment of the dried gel in the step 4) is as follows: the dry gel is ground into powder and then is roasted for 2 to 10 hours at the temperature of 500 to 600 ℃ in the nitrogen atmosphere.
Preferably, the drying treatment of the sol in the step 3) is as follows: the sol is washed by deionized water, and then the precipitate obtained after washing is dried for 2 to 24 hours at a temperature of between 60 and 120 ℃.
More preferably, the adding amount of the conductive carbon black in the mixed solution in the step 2) refers to the following ratio: the mass ratio of the tin compound precursor to the conductive carbon black in the mixed solution is 2-6.
More preferably, the concentration of the hydrogen peroxide in the step 1) is 10-30%; in the step 2), before the mixed solution is heated and refluxed, the pH value of the mixed solution is adjusted to 8-10 by ammonia water; the drying temperature in the step 3) is 100 ℃, and the drying time is 8-16 h; the roasting temperature in the step 4) is 500-600 ℃, and the roasting time is 3-8 h.
On the basis, the invention provides a calcium stannate-tin oxide/conductive carbon black nano catalyst, which is characterized in that: mainly comprises carrier conductive carbon black and a calcium stannate-tin oxide mixture loaded on the carrier; wherein the mass ratio of the calcium stannate-tin oxide mixture to the conductive carbon black is 1-8; the specific surface area of the conductive carbon black is 100-2000 m 2 (ii)/g; the mass ratio of calcium stannate to tin dioxide in the calcium stannate-tin oxide mixture is 0-100.
Preferably, the nano catalyst has a perovskite-tin oxide compound structure with a molecular formula of CaSnO 3 -SnO 2 C; the grain diameter of the catalyst is 5-50 nm.
More preferably, the mass ratio of the calcium stannate-tin oxide mixture to the conductive carbon black in the calcium stannate-tin oxide/conductive carbon black nano catalyst is 2-6.
The preparation method of the calcium stannate-tin oxide/conductive carbon black nano catalyst effectively reduces the roasting temperature in the preparation process of the catalyst, greatly reduces energy consumption and environmental pollution, reduces the technical parameter requirements on production equipment, and simultaneously reduces the production cost of the catalyst. The calcium stannate-tin oxide/conductive carbon black nano catalyst prepared by the invention has the advantages of high dispersibility, small size, high conductivity, high specific surface area and the like. The catalyst has smaller nano particle size and high dispersibility, can provide more surface unsaturated coordination Sn active centers, has good conductivity, and further greatly improves the electrocatalysis performance of the catalyst through two electron water oxidation; meanwhile, the catalyst nanoparticles have small size, can be better attached to electrode materials, and effectively improve the reaction stability.
Description of the drawings:
FIG. 1 is an X-ray diffraction pattern (XRD pattern) of a calcium stannate-tin oxide/conductive carbon black catalyst.
FIG. 2 is a N of calcium stannate and calcium stannate-tin oxide/conductive carbon black catalysts 2 Low-temperature physical adsorption and desorption isotherms.
The specific implementation mode is as follows:
the technical solution of the present invention will be described in detail below in order to make the objects, technical solutions and advantages of the present invention clearer, but the following embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the examples in the present invention, are within the scope of the present invention.
Example 1
1) 0.333g of calcium chloride (CaCl) 2 ) 0.677g of tin dichloride dihydrate (SnCl) 2 ·2H 2 O) and 0.63g of oxalic acid are dissolved in 30ml of hydrogen peroxide with the mass fraction of 30 percent to obtain a mixed solution containing the tin compound precursor.
2) According to the tin compound precursor and the conductive carbon black (the specific surface area is 1500 m) 2 The mass ratio of the conductive carbon black to the mixed solution is 4.775 g; then, adjusting the pH of the mixed solution to 9-10 by using 30% ammonia water, and dropwise adding the ammonia water while violently stirring in the process of adjusting the pH until the mixed solution reaches the required pH; and heating and refluxing the mixed solution in a constant-temperature water bath at 50 ℃ for 5 hours to obtain sol.
3) Washing the sol with deionized water to obtain black precipitate, and stoving the precipitate in an oven at 100 deg.c for 12 hr to evaporate water to obtain dry gel.
4) And grinding the dry gel into powder, placing the powder in a tubular furnace, and roasting the powder for 5 hours at 500 ℃ under the protection of nitrogen atmosphere to obtain a catalyst product.
The activity test of hydrogen peroxide generation shows that the activity of the hydrogen peroxide of the catalyst product prepared in the example 1 is 8500 mu mol/g cat /min。
Example 2
All the process steps including the raw material addition amount and the reaction conditions in this example were the same as in example 1 except that the calcination temperature in step 4) was 600 ℃.
The activity test of hydrogen peroxide generation shows that the activity of hydrogen peroxide of the catalyst product prepared in the example 2 is 1700 mu mol/g cat /min。
Example 3
In this example, all process steps including the raw material addition amount and the reaction conditions were the same as in example 1 except that the conductive carbon black was not added in step 2) and the calcination temperature in step 4) was 800 ℃.
The hydrogen peroxide solution activity test shows that the hydrogen peroxide solution activity of the catalyst product prepared in the example 2 is 350 mu mol/g cat /min。
FIG. 1 is an X-ray diffraction pattern (XRD pattern) of the catalyst of the present invention, which shows that pure calcium stannate shows characteristic diffraction peaks at 22.5 °, 32.0 °, 46.0 °, 56.5 ° and 57.6 ° at 800 ℃, corresponding to CaSnO 3 (020) Crystal planes of (121), (202), (321) and (123) belonging to CaSnO 3 The nano particle size of the orthorhombic system of (1) is 53.2nm. Loading at 600 deg.C at 1500m 2 The structure of calcium stannate nano particles on the conductive carbon black is basically the same as that of pure calcium stannate, the nano particles contain a small amount of tin oxide, and the particle size is 19.8nm. Loading at 500 deg.C at 1500m 2 The catalyst on the conductive carbon black has tin oxide characteristic diffraction peaks at 23 degrees, 34 degrees, 38 degrees and 52 degrees, and the size of the nano particle is 5.7nm.
The adsorption-desorption curves of fig. 2 show that: the specific surface area of the pure calcium stannate catalyst is very small, and in contrast, the calcium stannate-tin oxide/conductive carbon black catalyst has a very large specific surface area, which is beneficial to the dispersion of the calcium stannate-tin oxide on the surface of the carrier into nano particles with smaller sizes.
The above description is only a typical embodiment of the present invention, and is not intended to limit the present invention. Any modifications, variations and equivalents of the above-described embodiments, which are made in accordance with the technical spirit of the present invention, are still within the scope of the claims of the present application.
Claims (9)
1. A calcium stannate-tin oxide/conductive carbon black nano catalyst and a preparation method thereof are characterized by comprising the following steps:
1) Dissolving calcium chloride, tin dichloride dihydrate and organic acid in hydrogen peroxide to obtain a mixed solution containing a tin compound precursor;
2) Adding conductive carbon black into the mixed solution, adjusting the pH value of the solution to 6-12, and then heating and refluxing at the constant temperature of 50 ℃ for 1-10 h to obtain sol;
3) Drying the sol to evaporate water to obtain dry gel;
4) And roasting the dried gel to obtain a catalyst product.
2. The method for preparing a catalyst according to claim 1, wherein: the adding amount of the conductive carbon black in the mixed solution in the step 2) refers to the following proportion: the mass ratio of the tin compound precursor to the conductive carbon black in the mixed solution is 1-8; the specific surface area of the conductive carbon black is 100-2000 m 2 /g。
3. The method for preparing a catalyst according to claim 1, wherein: the adding amount of the conductive carbon black in the mixed solution in the step 2) refers to the following proportion: the mass ratio of the tin compound precursor to the conductive carbon black in the mixed solution is 2-6; the specific surface area of the conductive carbon black is 1500-2000 m 2 /g。
4. The catalyst preparation method according to any one of claims 1 to 3, characterized in that: the organic acid in the step 1) is oxalic acid or citric acid.
5. The catalyst preparation method according to claim 4, characterized in that: the roasting treatment of the dried gel in the step 4) is as follows: the dry gel is ground into powder and then is roasted for 2 to 10 hours at a temperature of between 500 and 600 ℃ in a nitrogen atmosphere.
6. The method for preparing a catalyst according to claim 5, wherein: the drying treatment of the sol in the step 3) comprises the following steps: the sol is washed by deionized water, and then the precipitate obtained after washing is dried for 2 to 24 hours at the temperature of between 60 and 120 ℃.
7. The method for preparing a catalyst according to claim 6, wherein: the concentration of hydrogen peroxide in the step 1) is 10-30%; in the step 2), before the mixed solution is heated and refluxed, the pH value of the mixed solution is adjusted to 8-10 by ammonia water; the drying temperature in the step 3) is 100 ℃, and the drying time is 8-16 h; the roasting temperature in the step 4) is 500-600 ℃, and the roasting time is 3-8 h.
8. A nanocatalyst prepared by the catalyst preparation method of claim 7, wherein: mainly comprises carrier conductive carbon black and a calcium stannate-tin oxide mixture loaded on the carrier; wherein the mass ratio of the calcium stannate-tin oxide mixture to the conductive carbon black is 1-8; the specific surface area of the conductive carbon black is 100-2000 m 2 (ii)/g; the mass ratio of calcium stannate to tin dioxide in the calcium stannate-tin oxide mixture is 0-100.
9. The nanocatalyst of claim 8, wherein: the nano catalyst has a perovskite-tin oxide compound structure and the molecular formula of the nano catalyst is CaSnO 3 -SnO 2 C, performing reaction; the grain diameter of the catalyst is 5-50 nm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107867714A (en) * | 2017-10-26 | 2018-04-03 | 中国工程物理研究院化工材料研究所 | Nanocrystalline SnO2/ graphene composite air-sensitive material and preparation method thereof |
| CN113149063A (en) * | 2020-01-22 | 2021-07-23 | 付冬 | Method for preparing calcium stannate nano particles and method for preparing corresponding electrode |
| CN114314643A (en) * | 2021-12-13 | 2022-04-12 | 广东先导稀贵金属材料有限公司 | Preparation method and application of calcium stannate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107867714A (en) * | 2017-10-26 | 2018-04-03 | 中国工程物理研究院化工材料研究所 | Nanocrystalline SnO2/ graphene composite air-sensitive material and preparation method thereof |
| CN113149063A (en) * | 2020-01-22 | 2021-07-23 | 付冬 | Method for preparing calcium stannate nano particles and method for preparing corresponding electrode |
| CN114314643A (en) * | 2021-12-13 | 2022-04-12 | 广东先导稀贵金属材料有限公司 | Preparation method and application of calcium stannate |
Non-Patent Citations (1)
| Title |
|---|
| SO YEON PARK ET AL.: "CaSnO3: An Electrocatalyst for Two-Electron Water Oxidation Reaction to Form H2O2", ACS ENERGY LETT., vol. 4, 28 December 2018 (2018-12-28), pages 352 - 357 * |
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