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Core-shell-structured oxide supported Pt catalyst as well as preparation method and application of Pt catalyst

A technology of core-shell structure and catalyst, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Improvement and other issues, to achieve the effects of low load, improved performance, and excellent low-temperature denitrification performance

Active Publication Date: 2018-01-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently used for hydrogen selective reduction of NO x Most of the catalysts are noble metals, and the problem is that the temperature window is narrow, and the NO x The conversion rate needs to be improved, and precious metals are expensive

Method used

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  • Core-shell-structured oxide supported Pt catalyst as well as preparation method and application of Pt catalyst
  • Core-shell-structured oxide supported Pt catalyst as well as preparation method and application of Pt catalyst
  • Core-shell-structured oxide supported Pt catalyst as well as preparation method and application of Pt catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 0.5% Pt / SiO 2 @TiO 2 Preparation of (Ti:Si=1:5) catalyst

[0023] a) Stir and mix 145mL ethanol, 95mL ammonia water and 20mL deionized water to obtain a mixed solution, then add 50mmol tetraethylorthosilicate to the mixed solution, heat to 50°C, reflux in a water bath for 2h, cool to room temperature, and then dissolve the reaction solution Perform centrifugal filtration and dry at 120°C for 24 hours to obtain spherical SiO 2 ;

[0024] b) 250mL ethanol and 10mmol tetrabutyl titanate were ultrasonically mixed to obtain a mixed solution, and the spherical SiO obtained in step (a) 2 Add it into the mixed solution, stir and sonicate for 30 minutes, and record it as mixed solution A; stir and mix 50mL ethanol and 250mL deionized water, and record it as solution B.

[0025] c) The solution B obtained in the step (b) is added dropwise to the mixed solution A, and the stirring reaction is continued for 12 hours after the dropwise addition is completed. The solu...

Embodiment 2

[0028] Example 2: 0.5% Pt / SiO 2 @TiO 2 Preparation of (Ti:Si=1:7.5) catalyst

[0029] a) Stir and mix 145mL ethanol, 95mL ammonia water and 20mL deionized water to obtain a mixed solution, then add 50mmol tetraethylorthosilicate to the mixed solution, heat to 70°C, reflux in a water bath for 4h, cool to room temperature, and then dissolve the reaction solution Perform centrifugal filtration and dry at 120°C for 12 hours to obtain spherical SiO 2 ;

[0030] b) 200mL of ethanol and 6.67mmol of tetrabutyl titanate were ultrasonically mixed to obtain a mixed solution, and the spherical SiO obtained in step (a) 2 Add it into the mixed solution, stir and sonicate for 30 minutes, and record it as mixed solution A; stir and mix 50mL ethanol and 200mL deionized water, and record it as solution B;

[0031] c) The solution B obtained in step (b) was added dropwise to the mixed solution A, and after the dropwise addition was completed, the stirring reaction was continued for 8 hours. ...

Embodiment 3

[0034] Example 3: 0.5% Pt / SiO 2 @TiO 2 Preparation of (Ti:Si=1:10) catalyst

[0035] a) Stir and mix 145mL ethanol, 95mL ammonia water and 20mL deionized water to obtain a mixed solution, then add 50mmol tetraethyl orthosilicate to the mixed solution, heat to 60°C, reflux in a water bath for 3h, cool to room temperature, and then dissolve the reaction solution Perform centrifugal filtration and dry at 120°C for 12 hours to obtain spherical SiO 2 ;

[0036] b) 180mL ethanol and 5.0mmol tetrabutyl titanate were ultrasonically mixed to obtain a mixed solution, and the spherical SiO obtained in step (a) 2 Add it into the mixed solution, stir and sonicate for 30 minutes, and record it as mixed solution A; stir and mix 50mL ethanol and 250mL deionized water, and record it as solution B;

[0037] c) The solution B obtained in the step (b) is added dropwise to the mixed solution A, and the stirring reaction is continued for 10 h after the dropwise addition is completed. The solut...

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PUM

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Abstract

The invention provides a core-shell-structured oxide supported Pt catalyst as well as a preparation method and an application of the Pt catalyst, and belongs to the technical field of environmental catalysis and air pollution control. The catalyst takes SiO2@TiO2 with a core-shell structure as a supporter and Pt as an active component and is characterized in that spherical SiO2 is taken as the inner core, and the surface of SiO2 as the inner core is coated with TiO2. By means of generation of the core-shell structure of SiO2@TiO2, performance of selective reduction of NOx by hydrogen on the Ptcatalyst is remarkably improved, so that the catalyst has good low-temperature denitration performance. The Pt catalyst adopts a simple preparation process, can realize efficient removal of NOx at low temperature, and has wide application prospect.

Description

technical field [0001] The invention relates to a core-shell structure oxide-supported Pt catalyst, a preparation method and the selective catalytic reduction of NO by using the catalyst under oxygen-enriched conditions x . It is suitable for NO in flue gas from mobile sources such as diesel vehicles and stationary sources such as industrial boilers and smelters x The invention belongs to the technical field of environmental catalysis and air pollution control. Background technique [0002] With the growth of energy consumption and the rapid increase of motor vehicle ownership, the large amount of fossil fuel consumption leads to the emission of NO into the atmosphere x Rapid increase, NO x Not only can it cause ecological and environmental problems such as acid rain and smog, but it also seriously endangers people's health. Therefore, how to effectively eliminate NO x Emissions are currently a hot topic in the field of air pollution control and environmental catalysis....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J37/34B01J37/08B01D53/90B01D53/56
Inventor 刘志明武锦鹏赵媛媛
Owner BEIJING UNIV OF CHEM TECH
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