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Method for improving catalytic oxidization activity of VOCs catalyst

A catalytic oxidation and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of restricting large-scale sustainable applications, limited resources, and high use costs, and achieve good low-temperature catalytic oxidation activity. , The effect of reducing the catalytic oxidation temperature and reducing the production cost

Active Publication Date: 2014-12-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Precious metal catalysts such as Pt and Pd have excellent catalytic activity, long service life and wide application range, but due to limited resources, the cost of use is high, which limits their large-scale sustainable application.

Method used

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  • Method for improving catalytic oxidization activity of VOCs catalyst
  • Method for improving catalytic oxidization activity of VOCs catalyst
  • Method for improving catalytic oxidization activity of VOCs catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Pt-Ni / SiO prepared by flame spray pyrolysis 2 Catalyst powder (Pt, Ni molar ratio is 1:1), at 300°C, in H 2 After the atmosphere was reduced for 1 hour, it was naturally cooled to room temperature, and the reduced powder was immersed in 0.1 mol / L nitric acid, and etched for 12 hours. The acid liquid and the powder are separated by centrifugation, washed with distilled water, centrifuged, and vacuum-dried in a vacuum oven to obtain a catalyst powder product with an active component content of 1%.

Embodiment 2

[0048] Pt-Ag / SiO prepared by flame spray pyrolysis 2 Catalyst powder (Pt, Ag molar ratio is 1:1), at 1100°C, in H 2 After the atmosphere was reduced for 1 hour, it was naturally cooled to room temperature, and the reduced powder was immersed in 2mol / L nitric acid, and etched for 6 hours. The acid liquid and the powder are separated by centrifugation, washed with distilled water, centrifuged, and vacuum-dried in a vacuum oven at 50°C to obtain a catalyst powder product with an active component content of 1%.

Embodiment 3

[0050] Pt-Ni / TiO prepared by flame spray pyrolysis 2 Catalyst powder (Pt, Ni molar ratio is 1:1), at 500°C, in H 2 After the atmosphere was reduced for 2 hours, it was naturally cooled to room temperature, and the reduced powder was immersed in 1 mol / L hydrochloric acid, and etched for 12 hours. The acid liquid and the powder are separated by centrifugation, washed with distilled water, centrifuged, and vacuum-dried in a vacuum oven at 50°C to obtain a catalyst powder product with an active component content of 1%.

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Abstract

The invention relates to a method for improving the catalytic oxidization activity of a VOCs catalyst. The alloy catalyst prepared by adopting a flame spray pyrolysis method is subjected to high-temperature reduction, acid etching and the like, so that the catalytic oxidization activity of the catalyst can be remarkably improved. The catalyst carrier is an oxide or simple substance which cannot be dissolved by acid, the active component is Pt or / and Au and at least one alloy that is formed by metal dissolvable by acid. The metal dissolvable by acid can be partially or entirely etched during etching. Due to the porous structure of the etched alloy, the contact area between the active component and a reactant can be increased, and the mass transfer process can be enhanced, so that the catalytic oxidization activity of the catalyst can be improved. The method for improving the load type catalyst is simple in technology, and continuous and controllable in process, and large-scale production is easily realized.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a method for improving the activity of a VOCs catalytic oxidation catalyst. Specifically, the alloy catalyst powder prepared by the flame spray pyrolysis method was passed through high temperature H 2 The treatment methods of reduction and acid etching in the atmosphere can improve the porosity of the active components, enhance the mass transfer and heat transfer process, and reduce the working temperature of catalytic reactions such as VOCs catalytic oxidation, thereby improving the catalytic oxidation activity of the catalyst. Background technique [0002] Benzene series (benzene, toluene, xylene, styrene, etc.) are a class of volatile organic pollutants (VOCs) with a wide range of sources, and are one of the main pollutants in the air (especially in the indoor environment). Long-term or short-term exposure to The environment of benzene series will cause serious har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/50B01J23/62B01J23/44B01J23/52B01J23/96B01D53/86B01D53/72
CPCB01D53/72B01D53/86B01J23/44B01J23/50B01J23/52B01J23/62B01J23/89B01J23/96
Inventor 陈运法岳仁亮刘刚赵峰刘海弟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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