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Supported gold-PGM alloy catalyst with stable storage property and preparation method thereof

An alloy catalyst and supported technology, which is applied in the field of supported gold-platinum metal alloy catalyst and its preparation, can solve the problems of no preparation process, achieve good long-term storage performance, improve activity, and reduce the amount of gold.

Inactive Publication Date: 2012-11-07
安立敦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far there is no commercially available supported Au-PGM catalyst with a fixed composition and preparation process for low-temperature oxidation of CO.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the catalyst carrier used in the present invention can be co-precipitation method and impregnation method.

[0020] The coprecipitation method preparation process of catalyst support can be: the salt solution of appropriate MI and MII metal salt solution and carrier metal is added dropwise to Na 2 CO 3 (or K 2 CO 3 ) solution, the desired catalyst carrier can be obtained after standing, separating, roasting and activating treatment.

[0021] The impregnation method preparation process of composite catalyst support can be: the carrier (such as Al 2 o 3 ) impregnated, after standing for at least 1 hour, dried and calcined to obtain a composite oxide carrier.

[0022] The loading of nano gold adopts deposition-precipitation method or anion impregnation method. Among them, the deposition-precipitation method is to dry the preformed oxide carrier with a high specific surface area, put it into the active component Au precursor solution at a tem...

example 1

[0028] Example 1: Measure 0.67mL (NH 4 ) 2 PdCl 4 The solution (1.4972g Pd / L) was poured into a 50mL beaker, 2.2mL deionized water was added, shaken well, and 2.006g Al 2 o 3 Spherical carrier (roasted at 650°C for 4h) impregnated, shaken and left to stand for 1h, dried at 80-120°C for 4h, then reduced in hydrogen flow at 450-470°C for 2h, naturally cooled to room temperature. Measure 1.0mL HAuCl 4 Pour the solution (20gAu / L) into a 50mL beaker, add 1.5mL deionized water, add about 0.5ml NaOH (1M) solution dropwise, adjust the pH of the solution to 9, pour the above impregnated Pd carrier into the impregnation, mix well, Let stand for 2h, soak in 20ml ammonia water (pH=10) for 24h, filter off the clear night, wash with deionized water until no detectable (with AgNO 3 solution) Cl - ions, dried at 60°C for 12h, and reduced with hydrogen at 300°C for 1h to obtain a beige finished catalyst.

[0029] The raw gas composition is: CO: 1%; O 2 : 12%; N 2 : 87% (volume percent...

example 2

[0031] Example 2: Measure 1.34mL (NH 4 ) 2 PdCl 4 The solution (1.4972g Pd / L) was poured into a 50mL beaker, diluted with 2.05mL deionized water, shaken well, and poured into 2.014g Al 2 o 3 The spherical carrier was impregnated, shaken and left to stand for 2 hours, dried at 80°C overnight, then reduced in a hydrogen stream at 450-470°C for 2 hours, and naturally cooled to room temperature. Measure 1.26mL HAuCl 4 Pour the solution (23.90gAu / L) into a 50mL beaker, add 1.35mL deionized water, add about 0.5ml NaOH (1M) solution dropwise, adjust the pH of the solution to 9, and pour the above-mentioned reduced Pd-containing carrier into the impregnated , mix well, let stand for 2h, soak with 20ml of ammonia water (pH=10) for 24h, filter off the clear night, wash with deionized water until no detectable (with AgNO 3 solution) Cl - ions, dried overnight at 60°C, and reduced with hydrogen at 300-400°C for 1 hour to obtain a light brown finished catalyst. Using the catalyst ev...

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PUM

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Abstract

The invention relates to a supported gold-PGM alloy catalyst with stable storage property and a preparation method thereof. An active component is Au, an accessory ingredient is Pd or Pt in PGM, and a carrier is a Al2O3 composite oxide modified by Al2O3 or MIOx and MIIOx, wherein the atomic ratio of Au to PGM is 1.0:1.0-1.0:1.0*10-2; the atomic ratio of Au to MI+MII is 1.0:1.0-1.0:10; the atomic ratio of MI to MII is 2.0:1.0-0.2:1.0; the atomic ratio of Au to Al is 1.0:1.0*103-1:0:10; MI is La; and MII is Fe, Co or Ni. The composite oxide carrier is prepared by an impregnation method or a coprecipitation method. After being supported with MIOx and MIIOx, Al2O3 is roasted at a temperature of between 800 and 1,000 DEG C to generate a spinelle or perovskite structure. The catalyst of the invention catalytically oxidizes micro CO (0.1 percent to 1.5 percent) in the air into CO2 at ambient temperature and in ambient humidity, and has the advantages of stable catalysis property, pressure drop meeting the requirements of a gas mask and a mining self-rescuer and low cost.

Description

(1) Technical field [0001] The present invention relates to a kind of gold-platinum group metal (Platinum Group Metal, PGM) alloy catalyst, specifically, it is to catalyze and oxidize trace amount (0.1%~1.5%) CO in the air into CO under ambient temperature and ambient humidity. 2 A supported gold-platinum metal alloy catalyst with stable catalytic performance and pressure drop meeting the requirements of gas masks and air purification, industrial applicability, and relatively low cost, and a preparation method thereof. (two), background technology [0002] At present, gas masks in my country use Hopcalite catalysts, which are composite oxide catalysts mainly composed of CuO-MnOx (Lamb, A.B., Bray, W.C, Frazer, J.C.W.; Ind.Eng.Chem., 1920, 12, 213) , is a gas mask catalyst material that has been used as early as World War I. Its fatal shortcoming is poor water resistance, so a larger and heavier "drying tank" must be added before the "oxidizing tank". Supported gold catalyst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J23/89B01J32/00B01J37/02B01J37/03B01D53/86B01D53/62
CPCY02A50/20
Inventor 安立敦齐世学林清泉邹旭华
Owner 安立敦
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