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Load type gold catalyst with stabilized catalyzing performance and its preparation process

A technology of catalytic performance and gold catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problem of insufficient long-term storage stability of the catalyst, reduced activity, inability to Meet the use requirements and other issues, and achieve the effects of good sulfur poisoning resistance, stable activity, and good long-term storage resistance

Inactive Publication Date: 2008-05-28
SHANXI RUISHI PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Authorized (An Lidun, Qi Shixue, Zou Xuhua, Suo Zhanghuai; Practical low-temperature CO catalytic oxidation catalyst; ZL 00 1 22829.3) and patents under substantive review (An Lidun, Qi Shixue, Zou Xuhua, Suo Zhanghuai; for CO Supported nano-gold catalyst for low-temperature catalytic oxidation; PCT international application number: PCT / CN01 / 01582; ​​international application date: November 23, 2001) The patented catalyst can maintain high catalytic activity within one year of storage. Afterwards, its activity will gradually decrease until it cannot meet the requirements of use, that is, the long-term storage stability of the catalyst is still insufficient.

Method used

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preparation example Construction

[0018] The preparation method of the catalyst carrier used in the present invention can be a co-precipitation method or an impregnation method.

[0019] The preparation process of the catalyst carrier by the co-precipitation method can be: adding an appropriate amount of MI and MII metal salt solution and the carrier metal salt solution to Na while stirring. 2 CO 3 (Or K 2 CO 3 ) In the solution, the required catalyst carrier can be obtained by standing, separating, calcining, and activating.

[0020] The preparation process of the catalyst carrier by impregnation method can be: use a suitable amount of MI and MII metal salt solution with a shaped carrier (such as Al 2 O 3 ) Impregnation, after standing for at least 1 hour, drying and calcination to obtain a composite oxide carrier.

[0021] The loading of nano-gold adopts the deposition-precipitation method or the anion impregnation method.

[0022] The preparation process of the catalyst deposition-precipitation method can be as f...

example 1

[0030] Example 1: Add 0.0325g CuCl 2 ·2H 2 O and 0.0419g FeCl 3 ·6H 2 O is melted in 2.6ml water, and the formed 2.0g Al 2 O 3 The spherical carrier was added to the above solution, shaken and allowed to stand for 1 hour, dried at 80-120°C for 4 hours, calcined at 800°C in air atmosphere for 3 hours, and naturally cooled to room temperature. Measure 0.75ml HAuCl 4 Solution (20gAu / L), add 0.2ml deionized water, add 0.25ml NaOH(1M) solution, adjust the pH of the solution to 9-10, pour the above composite carrier into immersion, mix well, let stand for 1h, use 20ml ammonia water (pH=10-11) Soak for 24h, filter to clear the night, wash with deionized water until no detectable (with AgNO 3 Solution) Cl - Ion, dried at 60°C for 12 hours, and reduced with hydrogen at 300°C for 1 hour to obtain a light brown finished catalyst.

[0031] The raw material gas composition is: CO: 1%; O 2 : 12%; N 2 :87% (volume percentage), gas volumetric space velocity is 1.5×10 4 h -1 In the case of complet...

example 2

[0034] Example 2: The composite carrier used in Example 1 is used. Measure 0.75ml HAuCl 4 Solution (20gAu / L), add 0.75ml deionized water, and directly impregnate the composite carrier with this gold solution. Mix well, let stand for 1h, soak in 20ml ammonia water (pH=10-11) for 24h, filter to clear the night, wash with deionized water until nothing can be detected (use AgNO 3 Solution) Cl - Ion, dried at 60°C for 12 hours, and reduced with hydrogen at 300°C for 1 hour to obtain a light brown finished catalyst. Its lowest full conversion temperature is -24.0℃.

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Abstract

A carried Au catalyst with high catalytic stability is composed proportionally of the active component (Au) and the carrier chosen from MIOx, MILOx modified Al2O3 and TiO2 / Al2O3. It features the strong mutual action between Au nano-particles and transition metal oxide with spinel structure and the alloy structure formed by part of Au particles and transition metal, resulting in high catalytic activity and stability.

Description

Technical field [0001] The invention relates to a gold catalyst, specifically, it catalyzes and oxidizes a trace amount (0.1% to 1.0%) of CO into CO in the air under ambient temperature and humidity. 2 , Supported gold catalyst with stable catalytic performance and pressure drop to meet the requirements of gas masks and air purification, and industrial practicality, and its preparation method. Background technique [0002] At present, most of our gas masks use Hopcalite catalyst, which is a composite oxide catalyst with CuO-MnOx as the main component (Lamb, AB, Bray, WC, Frazer, JCW; INd. Eng. Chem., 1920, 12, 213) , Is a gas mask catalyst material that has been used in the First World War. Its fatal disadvantage is poor water resistance, so a larger and heavier "drying tank" must be added before the "oxidation tank". The supported gold catalyst can eliminate CO under ambient temperature (-10℃~40℃) and ambient humidity (An Lidun, Qi Shixue, Zou Xuhua, Suo Zhanghuai; practical low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J32/00B01J37/02
CPCB01J35/0013B01J23/52B01J37/03B01J37/0207B01J23/89B01J23/8926B01J23/005B01D53/86B01J35/23
Inventor 安立敦齐世学邹旭华
Owner SHANXI RUISHI PROTECTION TECH
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