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 catalysts and their preparation, can solve the problems of no preparation process and achieve good long-term storage resistance, good catalytic activity, and good water vapor poisoning Effect
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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 co-precipitation method preparation process of catalyst support can be: the salt solution of appropriate M I and M II 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 support (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 ...
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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