CN-122006747-A - Nanometer island-based high-dispersion Pt-based catalyst and preparation method and application thereof

Abstract

The invention provides a nano-island-based high-dispersion Pt-based catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method comprises the steps of uniformly dispersing titanium dioxide in water to obtain a dispersion liquid, adding water-soluble cobalt salt into the dispersion liquid, adjusting pH to be alkaline, stirring for reaction 1, carrying out solid-liquid separation, sequentially drying the obtained solid 1, calcining 1 to obtain a carrier, uniformly dispersing the carrier in water, adjusting pH to be acidic, adding soluble platinum salt, stirring for reaction 2, drying 2, and calcining 2 to obtain the nano-island-based high-dispersion Pt-based catalyst. The preparation method has the advantages that the preparation method is simple in process and low in cost, the cobalt nano islands are stably combined on the surface of the titanium dioxide carrier based on the positive and negative potential attraction strategy, and then Pt can be dispersed highly by utilizing the porous property of the nano island structure. The catalyst has excellent activity and stability of low-temperature catalytic oxidation chlorobenzene.

Inventors

• Yan Haiting
• CAI YU
• WANG MINGYUAN
• Cheng Yefangfei
• ZHAO LONGFEI
• LI ZHEN
• YE ZHAOLIAN
• ZHAO SONGJIAN
• LI ZHI

Assignees

• 江苏理工学院

Dates

Publication Date

20260512

Application Date

20260130

Claims (9)

1. 1. The preparation method of the nano-island-based high-dispersion Pt-based catalyst is characterized by comprising the following steps of: uniformly dispersing titanium dioxide in water to obtain a dispersion liquid; Adding water-soluble cobalt salt into the dispersion liquid, adjusting pH to be alkaline, stirring for reaction 1, performing solid-liquid separation, sequentially drying the obtained solid 1, and calcining 1 to obtain a carrier; And uniformly dispersing the carrier in water, regulating the pH to be acidic, adding soluble platinum salt, stirring for reaction 2, and then drying 2 and calcining 2 to obtain the nano-island-based high-dispersion Pt-based catalyst.
2. 2. The preparation method of the titanium dioxide/cobalt nitrate composite material is characterized in that the water-soluble cobalt salt is cobalt nitrate hexahydrate, and the mass ratio of the titanium dioxide to the cobalt nitrate is 1 (0.1-1).
3. 3. The method according to claim 1, wherein the pH is adjusted to be alkaline, wherein the pH=9 to 11, and the reagent used for adjusting the pH to be alkaline is sodium hydroxide.
4. 4. The preparation method of the catalyst according to claim 1, wherein the temperature of the stirring reaction 1 is room temperature for 20-40 min, the temperature of the calcination 1 is 400-600 ℃, the time is 10-14 h, and the temperature rising rate is 3-6 ℃ per min.
5. 5. The preparation method of claim 1, wherein the soluble platinum salt is chloroplatinic acid, and the mass ratio of the carrier to the chloroplatinic acid is 500 (2-3).
6. 6. The method according to claim 1, wherein the pH is adjusted to be acidic to a value of pH=2 to 3, and the reagent used for adjusting the pH to be acidic is hydrochloric acid.
7. 7. The preparation method according to claim 1, wherein the temperature of the stirring reaction 2 is room temperature for 20-40 min, the temperature of the calcination 2 is 400-600 ℃, the time is 2-4 h, and the temperature rising rate is 3-6 ℃ per min.
8. 8. The Pt-based catalyst of high dispersion based on nano islands prepared by the preparation method according to any one of claims 1 to 7.
9. 9. Use of the nano-island based high dispersion Pt-based catalyst of claim 8 for catalytic oxidation of chlorobenzene.

Description

Nanometer island-based high-dispersion Pt-based catalyst and preparation method and application thereof Technical Field The invention relates to the technical field of catalysts, in particular to a nano-island-based high-dispersion Pt-based catalyst and a preparation method and application thereof. Background Volatile Organic Compounds (VOCs) are a class of organic contaminants that are widely present in the atmosphere, mainly from industrial production, transportation, solvent use, and fuel burning, among other human activities. The catalytic combustion can treat most VOCs almost, has incomparable advantages especially for multi-component waste gas without recycling value, has the removal efficiency close to 100%, does not cause secondary pollution, and has fewer potential safety hazards. Catalytic oxidation technology is therefore widely studied as the current mainstream technology. Compared with non-noble metals, noble metal-based catalysts generally have excellent low-temperature catalytic activity, but noble metal catalysts are susceptible to corrosion poisoning of Cl 2 and HCl in products, are high in price, and limit large-scale popularization in the chemical industry field. Therefore, the development of new catalysts to overcome these drawbacks is a hotspot of current research. Disclosure of Invention In view of the above, the present invention aims to provide a nano-island-based highly dispersed Pt-based catalyst, a preparation method and an application thereof, and the catalyst provided by the present invention has low-temperature purification performance (T 90 =340 ℃) and excellent stability to chlorobenzene. In order to achieve the above object, the present invention provides the following technical solutions: According to one of the technical schemes, the preparation method of the nano-island-based high-dispersion Pt-based catalyst comprises the following steps: uniformly dispersing titanium dioxide in water to obtain a dispersion liquid; Adding water-soluble cobalt salt into the dispersion liquid, adjusting pH to be alkaline, stirring for reaction 1, performing solid-liquid separation, sequentially drying the obtained solid 1, and calcining 1 to obtain a carrier; And uniformly dispersing the carrier in water, regulating the pH to be acidic, adding soluble platinum salt, stirring for reaction 2, and then drying 2 and calcining 2 to obtain the nano-island-based high-dispersion Pt-based catalyst. According to the second technical scheme, the nano-island-based high-dispersion Pt-based catalyst prepared by the preparation method is provided. The third technical scheme of the invention is the application of the nano-island-based high-dispersion Pt-based catalyst in the catalytic oxidation of chlorobenzene. The invention discloses the following technical effects: The preparation method has the advantages that the preparation method is simple in process and low in cost, the cobalt nano islands are stably combined on the surface of the titanium dioxide carrier based on the positive and negative potential attraction strategy, and then Pt can be dispersed highly by utilizing the porous property of the nano island structure. The catalyst has excellent activity and stability of chlorobenzene catalytic oxidation at low temperature, and provides a new direction for developing efficient and low-cost Cl-VOCs treatment technology. Drawings In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 shows XRD patterns of catalysts prepared in example 1, comparative example 1 and comparative example 2 according to the present invention. FIG. 2 shows the conversion of the catalysts prepared in example 1, comparative example 1 and comparative example 2 of the present invention to catalytically oxidize Chlorobenzene (CB) at various temperatures. FIG. 3 shows the carbon dioxide (CO 2) yields at different temperatures for the catalysts prepared in example 1, comparative example 2 according to the present invention. FIG. 4 shows the stability curves of the catalysts prepared in example 1, comparative example 1 and comparative example 2 according to the present invention. Detailed Description Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in th