CN116618041A - Method for preparing ultra-low-load single-atom noble metal catalyst by weak reduction method and application - Google Patents
Method for preparing ultra-low-load single-atom noble metal catalyst by weak reduction method and application Download PDFInfo
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- 238000007084 catalytic combustion reaction Methods 0.000 claims abstract description 18
- 239000002243 precursor Substances 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000000967 suction filtration Methods 0.000 claims abstract description 12
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- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000011068 loading method Methods 0.000 claims description 37
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- 239000002923 metal particle Substances 0.000 claims description 20
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- NOWPEMKUZKNSGG-UHFFFAOYSA-N azane;platinum(2+) Chemical compound N.N.N.N.[Pt+2] NOWPEMKUZKNSGG-UHFFFAOYSA-N 0.000 claims description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- FDWREHZXQUYJFJ-UHFFFAOYSA-M gold monochloride Chemical compound [Cl-].[Au+] FDWREHZXQUYJFJ-UHFFFAOYSA-M 0.000 claims description 3
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- 239000011259 mixed solution Substances 0.000 claims description 3
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 claims description 3
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 claims description 3
- OJLCQGGSMYKWEK-UHFFFAOYSA-K ruthenium(3+);triacetate Chemical compound [Ru+3].CC([O-])=O.CC([O-])=O.CC([O-])=O OJLCQGGSMYKWEK-UHFFFAOYSA-K 0.000 claims description 3
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 3
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- 239000012855 volatile organic compound Substances 0.000 abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 abstract description 3
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 23
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- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- 238000011160 research Methods 0.000 description 3
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
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- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
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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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The application belongs to the technical field of environmental catalysis, and particularly relates to a method for preparing a single-atom noble metal catalyst with ultra-low load capacity by a weak reduction method and application thereof, wherein the method comprises the following steps: dissolving a noble metal precursor in organic alcohol, and stirring at a preset temperature for a preset period of time to obtain a solution A; and adding a carrier into the solution A, stirring uniformly to obtain a suspension B, and carrying out suction filtration, washing and drying on the suspension B to obtain the ultra-low load single-atom noble metal catalyst. According to the application, the organic alcohol is used as a weak reducing agent, and the noble metal precursor is reduced into single atoms at room temperature and is highly dispersed on the carrier, so that the ultra-low load single-atom noble metal catalyst is obtained, and the catalyst shows low ignition temperature, high performance and high stability in the catalytic combustion process of typical VOCs discharged in the chemical industry. In addition, the preparation method provided by the application is simple and easy to operate, low in noble metal usage amount and wide in application, and can realize large-scale preparation.
Description
Technical Field
The application relates to the technical field of environmental catalysis, in particular to a method for preparing a single-atom noble metal catalyst with ultra-low load capacity by a weak reduction method and application thereof.
Background
Under the background of cooperative control of fine particles and ozone, pollution reduction and emission reduction, volatile Organic Compounds (VOCs) replace sulfur dioxide and are listed as constraint indexes of atmospheric environment quality. As O 3 And PM2.5, VOCs pose a significant hazard to human health and the environment. Therefore, the pollution control of VOCs becomes a key and important point of air pollution control. Currently, catalytic combustion technology is one of the main technologies for destroying VOCs, which can oxidize VOCs into CO 2 And H 2 O has no secondary pollution, has the advantages of mature technology, simple operation, high purification efficiency and the like, and is widely applied to the treatment of high-medium-low concentration organic waste gas in the typical chemical industry. However, the catalyst used in the technology generally has the problems of higher cost, poor stability and the like. Therefore, the design and preparation of the catalyst which has low cost and can efficiently and stably degrade VOCs have very important research significance and social effect.
Currently, supported noble metal catalysts and transition metal oxides are often used for catalytic combustion of VOCs. Among them, supported noble metal catalysts have been commercially used on a large scale due to their good catalytic efficiency and wide applicability at low temperatures. The supported noble metal catalysts, however, still have some problems: (1) The active component has high noble metal load and low noble metal quantity which actually participates in the reaction; (2) The noble metal is expensive, and the high loading of the noble metal greatly increases the cost of the catalyst. (3) noble metal sources are less and scarce. Therefore, it is very important to reduce the loading of noble metals and ensure high performance of the catalyst.
For supported noble metal catalysts, the catalytic performance is largely dependent on noble metal loading, noble metal particle size, nature of the support, preparation method, and the like. In order to improve the performance of the catalyst and reduce the loading of noble metals, scholars at home and abroad try to improve the dispersity of the noble metals through different preparation methods so as to improve the utilization rate of the noble metals and reduce the loading of the noble metals. Research shows that the preparation of the high-dispersity single-atom noble metal catalyst can greatly improve the utilization rate of noble metal, but the performance of the catalyst is also greatly reduced while the loading of noble metal is reduced. However, at present, research and reports on the catalytic oxidation of ultralow-load single-atom noble metal catalyst prepared by a weak reduction method and applied to VOCs discharged by the chemical industry are not found.
Therefore, how to quickly prepare a noble metal catalyst with high efficiency, stability and low loading is a problem to be solved at present.
Disclosure of Invention
The application provides a method for preparing a single-atom noble metal catalyst with ultralow loading by a weak reduction method and application thereof, and aims to prepare a noble metal catalyst with high efficiency, stability and low loading.
In order to achieve the above object, the present application provides a method for preparing a low-load single-atom noble metal catalyst by a weak reduction method, wherein the catalyst is composed of active component noble metal particles and a carrier, and the method comprises the following steps:
dissolving a noble metal precursor in organic alcohol, and stirring at a preset temperature for a preset period of time to obtain a solution A;
and adding a carrier into the solution A, stirring uniformly to obtain a suspension B, and carrying out suction filtration, washing and drying on the suspension B to obtain the ultra-low load single-atom noble metal catalyst.
Further, the noble metal precursor is any one of platinum chloride, tetraamineplatinum acetate, tetraamineplatinum nitrate, platinum nitrate, gold chloride, palladium acetate, silver nitrate and ruthenium acetate.
Further, the noble metal particles have a size of less than 1nm.
Further, the organic alcohol is one or more mixed solutions of methanol, ethanol, glycol and glycerol.
Further, the preset temperature is 30-80 ℃.
Further, the stirring preset time is 10-60 min.
Further, the carrier is SiO 2 、Al 2 O 3 、TiO 2 、CeO 2 Any one of the following.
Further, the ultra-low loading monoatomic noble metal catalyst has a noble metal loading of 0.002 to 2wt.%.
The application also provides an application of the ultra-low load single-atom noble metal catalyst, and the ultra-low load single-atom noble metal catalyst as claimed in any one of claims 1 to 8 is applied to the field of catalytic combustion of tail gas discharged by the chemical industry.
The beneficial effects are that: in the application, a noble metal precursor is dissolved in organic alcohol and stirred for a preset time at a preset temperature to obtain a solution A in which the noble metal precursor is uniformly dispersed; the carrier is added into the solution A and stirred uniformly to obtain a suspension B, and the suspension B is subjected to suction filtration, washing and drying to obtain the ultralow-load single-atom noble metal catalyst with low noble metal load and small size, so that the preparation of the ultralow-load single-atom noble metal catalyst is realized, the ultralow-load single-atom noble metal catalyst has the performances of low ignition temperature, high performance and high stability, can be applied to the catalytic combustion field of tail gas discharged by the chemical industry, and effectively solves the problems of high cost, poor mass transfer effect, low activity, low stability and the like of the traditional noble metal-based catalyst. In addition, the preparation method based on the ultra-low-load single-atom noble metal catalyst is simple and easy to operate, low in noble metal usage amount and wide in application, and can realize large-scale preparation.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for preparing a single-atom noble metal catalyst with ultra-low loading by a weak reduction method according to the application;
FIG. 2 shows the ultra-low loading single-atom Pt-loaded SiO of the present application 2 STEM plot of catalyst (a) and high resolution EDS spectrum of monoatomic Pt (b);
FIG. 3 shows the macro preparation of ultra-low loading single-atom noble metal Pt loaded SiO according to the application 2 Catalytic combustion performance diagram of the catalyst for paraxylene;
FIG. 4 is an ultra-low level of the applicationSiO carried by single-atom noble metal Pd 2 A catalytic combustion performance diagram of the catalyst on cyclohexane;
FIG. 5 is a graph showing the catalytic combustion performance of the ultra-low loading single-atom noble metal Pt supported different supported catalysts of the application on toluene;
FIG. 6 shows the ultra-low loading single-atom noble metal Pt loaded SiO of the present application 2 Catalytic combustion performance of the catalyst for different VOCs.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, an embodiment of the present application provides a method for preparing a low-loading single-atom noble metal catalyst by a weak reduction method, wherein the catalyst is composed of active component noble metal particles and a carrier, and the method comprises the following steps S1-S2:
s1: and dissolving the noble metal precursor in organic alcohol, and stirring at a preset temperature for a preset period of time to obtain a solution A.
Dissolving a certain amount of noble metal precursor in a certain amount of organic alcohol, wherein the noble metal precursor is any one of platinum chloride, tetraamineplatinum acetate, tetraamineplatinum nitrate, platinum nitrate, gold chloride, palladium acetate, silver nitrate and ruthenium acetate; the organic alcohol is one or more mixed solutions of methanol, ethanol, glycol and glycerol, and is used as a weak reducing agent; stirring for 10-60 min at the temperature of 30-80 ℃ to obtain a solution A in which the noble metal precursor is uniformly dispersed, wherein the temperature is set to be 30-80 ℃ because the noble metal precursor is easy to quickly decompose at an excessive temperature, the reaction is not easy to control, and a certain potential safety hazard exists at the excessive reaction temperature; if the reaction is carried out at an excessively low temperature, the noble metal precursor is easy to decompose slowly or can not decompose, so that the reaction is not easy to carry out; the reaction speed is controlled in the temperature range of 30-80 ℃, the preparation of the catalyst is realized, no precise temperature instrument is needed for assistance, the experimental cost is reduced to a certain extent, and the reaction is easy to operate and relatively safe. The stirring time is set to be 10-60 min, because the size and the adhesion amount of the noble metal particles in the solution A are influenced by the stirring time, the noble metal particles are different in size and adhesion condition and further influence the performance of the catalyst due to different stirring time, namely if the stirring time is longer, the noble metal particles have aggregation risk, the noble metal particles are easy to become larger in size, and when the noble metal particles are too large in size, the noble metal particles are unfavorable to adhere to the carrier and further influence the performance of the catalyst; however, if the stirring time is too short, the noble metal particles cannot be adsorbed on the carrier, or only a small amount of noble metal particles are adsorbed on the carrier, so that the performance of the catalyst is affected; therefore, in order to ensure the performance of the catalyst, the stirring time is preferably 10-60 min, so that the size of the noble metal particles is smaller than 1nm, and the loading capacity of the noble metal particles on the carrier is ensured. And the organic alcohol is used as a weak reducing agent, so that the noble metal precursor is reduced into single atoms and uniformly dispersed in the solution, and an effective basis is provided for the subsequent loading of the noble metal precursor on the catalyst carrier.
S2: and adding a carrier into the solution A, stirring uniformly to obtain a suspension B, and carrying out suction filtration, washing and drying on the suspension B to obtain the ultra-low load single-atom noble metal catalyst.
Adding 1g of carrier into the solution A, wherein the carrier is SiO 2 、Al 2 O 3 、TiO 2 、CeO 2 Uniformly stirring the solution A added with 1g of carrier to obtain a suspension B, and carrying out suction filtration, washing and room-temperature drying on the suspension B to obtain the ultra-low-load single-atom noble metal catalyst, wherein the noble metal load of the ultra-low-load single-atom noble metal catalyst is 0.002-2 wt%; the noble metal loading of the ultralow-loading single-atom noble metal catalyst is low, the size is small, the catalyst has the performances of low ignition temperature, high performance and high stability, and can be applied to the field of catalytic combustion of tail gas discharged by the chemical industry so as to solve the problems of high cost, poor mass transfer effect, low activity, low stability and the like of the traditional noble metal-based catalyst.
The embodiment provides a method for preparing a single-atom noble metal catalyst with ultra-low load by a weak reduction method, which comprises the steps of dissolving a noble metal precursor in organic alcohol, and stirring for a preset time at a preset temperature to obtain a solution A in which the noble metal precursor is uniformly dispersed; the carrier is added into the solution A and stirred uniformly to obtain a suspension B, and the suspension B is subjected to suction filtration, washing and drying to obtain the ultralow-load single-atom noble metal catalyst with low noble metal load and small size, so that the preparation of the ultralow-load single-atom noble metal catalyst is realized, the ultralow-load single-atom noble metal catalyst has the performances of low ignition temperature, high performance and high stability, can be applied to the catalytic combustion field of tail gas discharged by the chemical industry, and effectively solves the problems of high cost, poor mass transfer effect, low activity, low stability and the like of the traditional noble metal-based catalyst. In addition, the preparation method based on the ultra-low-load single-atom noble metal catalyst is simple and easy to operate, low in noble metal usage amount and wide in application, and can realize large-scale preparation.
Example 1
1. Preparation
16. Mu. Mol of tetraamineplatinum acetate was dissolved in 300mL of methanol solvent, and stirred at room temperature for 15 minutes to obtain solution A.
1g of SiO was added to solution A 2 Stirring for 30min to obtain suspension B, and sequentially performing suction filtration, washing and drying to obtain noble goldSingle-atom catalyst Pt/SiO with load of 0.032 wt% 2 。
2. Characterization of topography
From FIG. 2 (a) single-atom catalyst Pt/SiO 2 As can be seen from the STEM diagram of (a) and the high-resolution EDS spectrum of FIG. 2 (b), the noble metal Pt is uniformly and highly dispersed in SiO with a size of less than 1nm 2 And (3) on a carrier.
Example 2
1. Preparation
160. Mu. Mol of tetraamineplatinum acetate was dissolved in 1L of methanol solvent, and stirred at room temperature for 15 minutes to obtain a solution A.
To solution A10 g of SiO was added 2 Stirring for 30min to obtain suspension B, and sequentially performing suction filtration, washing and drying to obtain single-atom catalyst Pt/SiO with noble metal Pt loading of 0.040 wt% 2 。
2. Performance testing
Paraxylene is used as a catalytic oxidation object, the initial concentration is 50+/-2 ppm, the gas flow is 3000mL/h, and the catalyst usage amount is 50mg. FIG. 3 is a schematic diagram of SiO 2 Pt/SiO with 10 times of Pt noble metal loading 2 Catalytic combustion performance curve of paraxylene, pt/SiO under the condition of pure heating 2 Para-xylene has a strong degradation capability, and has a light-off temperature of 100 ℃ and a T90 (temperature at 90% conversion of the xylene) of 210 ℃. So that the ultra-low load noble metal particles which enlarge the dosage of the carrier and the noble metal to 10 times can be uniformly dispersed in the SiO 2 The dispersity of the monoatomic noble metal can be effectively improved, the catalytic performance of the catalyst is improved, and the light-off temperature of the catalyst is reduced.
Example 3
1. Preparation
600. Mu. Mol of palladium acetate was dissolved in 300mL of a methanol solvent, and stirred at room temperature for 15 minutes to obtain a suspension A.
1g of SiO was added to solution A 2 Stirring for 30min to obtain suspension B, and sequentially performing suction filtration, washing and drying to obtain the noble metal Pd load of 0.0056wt.% monoatomic catalyst Pd/SiO 2 。
2. Performance testing
Cyclohexane is used as a catalytic oxidation object, the initial concentration is 40+/-2 ppm, the gas flow is 3000mL/h, and the catalyst usage amount is 50mg. As can be seen from the catalytic combustion performance diagram of the single-atom noble metal-based catalyst to cyclohexane of FIG. 4, under the condition of pure heating, the single-atom noble metal Pd/SiO 2 Has stronger degradation capability to cyclohexane, the ignition temperature is 210 ℃ and the T90 is 280 ℃. Therefore, the noble metal particles with ultra-low loading are uniformly dispersed in the SiO 2 The dispersity of the single-atom noble metal can be effectively improved, so that the catalytic performance of the catalyst is improved, and the light-off temperature of the catalyst is reduced.
Example 4
1. Preparation
8. Mu. Mol of tetraamineplatinum acetate was dissolved in 150mL of methanol solvent, and stirred at room temperature for 10 minutes to obtain solution A.
To solution A, 0.5g of the support TiO was added 2 Stirring for 30min to obtain suspension B, and sequentially performing suction filtration, washing and drying to obtain single-atom catalyst Pt/SiO with noble metal loading of 0.05 wt% 2 . Then, the carrier SiO 2 Change to Al 2 O 3 Other steps were unchanged, resulting in a noble metal Pt loading of 0.0056wt.% Pt/Al 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the SiO as a carrier 2 Change to TiO 2 Other steps were unchanged, resulting in a noble metal Pt loading of 0.16wt.% Pt/TiO 2 The method comprises the steps of carrying out a first treatment on the surface of the And SiO as a carrier 2 Change to CeO 2 Other steps are unchanged, and the Pt/CeO with the noble metal Pt loading of 0.02wt.% is obtained 2 。
2. Performance testing
Toluene is used as a catalytic oxidation object, the initial concentration is 50+/-2 ppm, the gas flow is 3000mL/h, and the catalyst usage amount is 50mg. According to the catalytic combustion performance diagram of the noble metal Pt supported by different catalysts for toluene shown in FIG. 5, under the condition of simple heating, the single-atom noble metal Pt supported on different carriers has strong degradation capability for the catalysts for toluene, the light-off temperature is 100-150 ℃, and the catalysts are completely degraded at 250 ℃. Therefore, the ultra-low load noble metal particles are uniformly dispersed on different carriers, so that the dispersity of the monoatomic toluene noble metal can be effectively improved, the catalytic performance of the catalyst is further improved, and the light-off temperature of the catalyst is reduced.
Example 5
1. Preparation
16. Mu. Mol of tetraamineplatinum acetate was dissolved in 300mL of methanol solvent, and stirred at room temperature for 15 minutes to obtain solution A.
1g of SiO was added to solution A 2 Stirring is continued for 30min to obtain a suspension B, and then the suspension B is sequentially subjected to suction filtration, washing and drying to obtain the catalyst with the noble metal Pt loading amount of 0.05 wt.%.
2. Performance testing
Toluene, paraxylene and benzene are used as catalytic oxidation objects, the initial concentration is 50+/-2 ppm, the gas flow is 3000mL/h, and the catalyst consumption is 50mg. From FIG. 6 (a), a single-atom noble metal Pt-supported SiO 2 The catalytic combustion performance diagram of the catalyst on different VOCs can be seen that under the condition of simple heating, the noble metal Pt supported catalyst has stronger degradation capability on paraxylene, toluene and benzene (T20 is about 160 ℃, and T90 is 190 ℃, 192 ℃ and 202 ℃ respectively). From FIG. 6 (b), noble metal Pt-supported SiO 2 As can be seen in the catalytic combustion stability profile of the catalyst for different VOCs, the monoatomic noble metal catalyst still maintains a removal rate of more than 90% for different VOCs within 12 hours. Therefore, the noble metal particles with ultra-low loading are uniformly dispersed in the carrier SiO 2 Can be applied to the high-efficiency catalytic combustion of different VOCs and can keep good thermal stability. Therefore, the method can be widely applied to the tail gas treatment in the chemical industry.
The foregoing examples are preferred embodiments of the present application, but the embodiments of the present application are not limited to the foregoing examples, so that all equivalents and modifications that do not depart from the principles of the application disclosed herein fall within the scope of the application.
Claims (9)
1. A method for preparing a super-low-load single-atom noble metal catalyst by a weak reduction method, which is characterized in that the catalyst consists of active component noble metal particles and a carrier, and comprises the following steps:
dissolving a noble metal precursor in organic alcohol, and stirring at a preset temperature for a preset period of time to obtain a solution A;
and adding a carrier into the solution A, stirring uniformly to obtain a suspension B, and carrying out suction filtration, washing and drying on the suspension B to obtain the ultra-low load single-atom noble metal catalyst.
2. The method for preparing a single-atom noble metal catalyst with ultra-low loading capacity by using a weak reduction method according to claim 1, wherein the noble metal precursor is any one of platinum chloride, tetraamineplatinum acetate, tetraamineplatinum nitrate, platinum nitrate, gold chloride, palladium acetate, silver nitrate and ruthenium acetate.
3. The method for preparing ultra-low loading single-atom noble metal catalyst by weak reduction according to claim 1, wherein the size of noble metal particles is less than 1nm.
4. The method for preparing the ultra-low-load single-atom noble metal catalyst by using the weak reduction method according to claim 1, wherein the organic alcohol is one or more mixed solutions of methanol, ethanol, glycol and glycerol.
5. The method for preparing the ultra-low loading single-atom noble metal catalyst by the weak reduction method according to claim 1, wherein the preset temperature is 30-80 ℃.
6. The method for preparing the ultra-low loading single-atom noble metal catalyst by the weak reduction method according to claim 1, wherein the stirring preset time is 10-60 min.
7. According to claimThe method for preparing the ultra-low load single-atom noble metal catalyst by the weak reduction method according to the 1, which is characterized in that the carrier is SiO 2 、Al 2 O 3 、TiO 2 、CeO 2 Any one of the following.
8. The method for preparing the ultra-low-loading single-atom noble metal catalyst by the weak reduction method according to claim 1, wherein the noble metal loading of the ultra-low-loading single-atom noble metal catalyst is 0.002-2 wt.%.
9. The application of the ultra-low load single-atom noble metal catalyst is characterized in that the ultra-low load single-atom noble metal catalyst as claimed in any one of claims 1 to 8 is applied to the field of catalytic combustion of exhaust gas discharged by the chemical industry.
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