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High stability nano gold catalyst for CO normal temperature oxidation and preparation method thereof

A high stability, catalyst technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, organic chemical methods, etc., can solve problems such as poor stability of gold catalysts

Inactive Publication Date: 2009-03-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The purpose of the present invention is to disclose a highly stable normal temperature CO oxidation-loaded nano-gold catalyst and a preparation method to solve the problem of poor stability of the gold catalyst and improve its stability while maintaining a good catalytic activity of the gold catalyst. for its commercial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 5%Ce-TiO 2 Preparation: Mix tetrabutyl titanate and absolute ethanol at a weight ratio of 1:20, then add an appropriate amount of Ce(NO 3 ) 3 Make mixed solution A, control the content of Ce to Ce-TiO 2 5% of the total weight. Mix Tween-60 and Span-60 at a weight ratio of 1:1, dissolve in an appropriate amount of absolute ethanol to make solution B. Under vigorous stirring, slowly drop solution A into solution B, and the weight of the two liquids is calculated as Tween-60: tetrabutyl titanate = 1:10. After the dropwise addition, adjust the mixed solution to pH=4 with nitric acid, continue to stir for 0.5 h until the solution is clear and transparent, slowly add the mixed solution of absolute ethanol and distilled water (volume ratio 1:1) to the mixed reaction solution, until the solution was completely transformed into a sol state. After static gelation, hang and dry at 45°C, and roast in air atmosphere to get 5% Ce-TiO 2 particles.

[0027] The roasting process ...

Embodiment 2

[0032] Ce(NO in Example 1 3 ) 3 Replaced by La(NO 3 ) 3 , to control the content of La as La-TiO 2 5% of the total weight, can produce 5% La-TiO 2 carrier.

[0033] The 5% Ce-TiO in Example 1 2 Change to 5% La-TiO 2 , 2.2% Au / 5% La-TiO can be prepared by the same method 2 catalyst. Catalyst evaluation method is the same as embodiment 1. The activity test shows that the 2.2%Au / 5%La-TiO prepared by this method 2 The catalyst can completely oxidize CO at room temperature, and the activity of the catalyst remains basically unchanged after 500 hours of use.

Embodiment 3

[0035] Ce(NO in Example 1 3 ) 3 Change to Ho(NO 3 ) 3 , control the content of Ho as Ho-TiO 2 5% of the total weight, can produce 5% Ho-TiO 2 carrier.

[0036] The 5% Ce-TiO in Example 1 2 Change to 5%Ho-TiO 2 , 2.2%Au / 5%Ho-TiO can be prepared by the same method 2 catalyst. Catalyst evaluation method is the same as embodiment 1. The activity test shows that the 2.2%Au / 5%Ho-TiO prepared by this method 2 The catalyst can completely oxidize CO at room temperature, and the activity of the catalyst remains basically unchanged after 500 hours of use.

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Abstract

The invention discloses a high stability catalyst used for oxidizing nano-Au by CO at room temperature and a preparation method thereof. The catalytic active component of the catalyst is Au or alloy formed by Au and noble metal Rh (or Pt). The carrier is TiO2 or TiO2 modified by rare earth, wherein, the rare earth is one or more than one of Ce, La, Ho, Dy and Tm. The preparation of the catalyst is divided into two steps: the sol-gel method is adopted to prepare TiO2 and carrier material of TiO2(Re-TiO2) modified by rare earth; then Re-TiO2 is taken as the carrier, the deposition-precipitation method is adopted to prepare a Au-Rh(or Pt) / Re-TiO2 catalyst. The catalyst of the invention has very high stability and can catalyze CO to lead to the complete conversion at room temperature. The activity of the catalyst remains the same after the catalyst is used for 1,000 hours.

Description

technical field [0001] The invention relates to a high-stability supported nano-gold catalyst capable of oxidizing CO at room temperature and a preparation method thereof, in particular to an alloy formed of gold or gold and noble metals as the main active component, modified by rare earth TiO 2 As a supported catalyst, the catalyst can catalyze the CO oxidation reaction at room temperature and has high stability. Background technique [0002] With the rapid development of modern industry, energy shortage and environmental pollution are becoming more and more serious. The development of new energy and the prevention of environmental pollution have become a major issue related to the national economy and people's livelihood. [0003] In the development of new energy sources, proton exchange membrane fuel cells have been widely studied due to their high energy conversion efficiency. Typically, hydrogen used in PEMFCs is produced by reforming or partial oxidation of hydrocarb...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/52C01B31/20A62D3/38C07B33/00B01J21/06C01B32/50
Inventor 卢冠忠王晓红郭耘张志刚郭杨龙王艳芹王筠松龚学庆
Owner EAST CHINA UNIV OF SCI & TECH
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