CuAu bimetallic catalyst, and preparation method and application of CuAu bimetallic catalyst

A bimetallic catalyst, metal ammonia technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of uneven distribution of active component copper, poor catalytic activity, poor catalyst stability, etc. utilization rate and the effect of improving catalytic performance

Inactive Publication Date: 2017-06-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is a two-step impregnation method, and there are problems such as uneven distribution of active component copper, poor catalyst stability, and poor catalytic activity during the preparation process.

Method used

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  • CuAu bimetallic catalyst, and preparation method and application of CuAu bimetallic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Preparation of CuAu bimetallic catalyst by ammonia distillation method:

[0060] (1) At room temperature, 1.1521g of Cu(NO 3 ) 2 ·3H 2 O with 0.0628 g of HAuCl 4 4H 2 O was dissolved in 50 mL of deionized water, and ammonia water was added to adjust the pH to 10 under stirring, and the stirring was continued for 10 min to obtain a metal ammonia complex solution;

[0061] (2) Add 2.67g of SBA-15 carrier to the metal ammonia complex solution obtained in step (1), add ammonia water to adjust the pH to 11.5, and stir for 4 hours to obtain a mixed solution;

[0062] (3) Heat the mixed solution obtained in step (2) to 80°C to remove ammonia by evaporation, stop heating after the pH drops to 6-7, filter the obtained mixed solution, and deionize the obtained precipitate with deionized water and ethanol After washing and filtering, drying at 80°C for 12 hours, a solid complex was obtained;

[0063] (4) Calcining the solid composite obtained in step (3) at 400° C. in air fo...

Embodiment 2

[0066] Preparation of CuAu bimetallic catalyst by ammonia distillation method:

[0067] (1) At room temperature, 1.1521g of Cu(NO 3 ) 2 ·3H 2 O with 0.0941 g of HAuCl 4 4H 2 O was dissolved in 50 mL of deionized water, and ammonia water was added to adjust the pH to 9.5 under stirring, and the stirring was continued for 10 min to obtain a metal ammonia complex solution;

[0068] (2) Add 2.655 g of SBA-15 carrier to the metal ammonia complex solution obtained in step (1), add ammonia water to adjust the pH to 12, and stir for 6 hours to obtain a mixed solution;

[0069] (3) Heat the mixed solution obtained in step (2) to 100°C to remove ammonia by evaporation, stop heating after the pH drops to 6-7, filter the obtained mixed solution, and deionize the obtained precipitate with deionized water and ethanol After washing and filtering, drying at 100°C for 8 hours, a solid complex was obtained;

[0070] (4) Calcining the solid composite obtained in step (3) at 380° C. for 4.5...

Embodiment 3

[0073] Preparation of CuAu bimetallic catalyst by ammonia distillation method:

[0074] (1) At room temperature, 1.1521g of Cu(NO 3 ) 2 ·3H 2 O with 0.1255 g of HAuCl 4 4H 2 O was dissolved in 50 mL of deionized water, and ammonia water was added to adjust the pH to 9 under stirring, and the stirring was continued for 10 min to obtain a metal ammonia complex solution;

[0075] (2) Add 2.64g of SBA-15 carrier to the metal ammonia complex solution obtained in step (1), add ammonia water to adjust the pH to 12.5, and stir for 2.5h to obtain a mixed solution;

[0076] (3) Heat the mixed solution obtained in step (2) to 120°C to remove ammonia by evaporation, stop heating after the pH drops to 6-7, filter the obtained mixed solution, and deionize the obtained precipitate with deionized water and ethanol After washing and filtering, drying at 90°C for 24 hours, a solid complex was obtained;

[0077] (4) Calcining the solid composite obtained in step (3) at 450° C. for 3 h in t...

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Abstract

The invention relates to a CuAu bimetallic catalyst, and a preparation method and application of the CuAu bimetallic catalyst. The preparation method comprises the steps: dissolving a cuprum source and an aurum source in water simultaneously, adding ammonia water to form a metal complex, adding a mesoporous silicon molecular sieve as a carrier, heating to remove ammonia by evaporation after regulating pH (potential of hydrogen), and performing subsequent roasting and reduction activation to form the CuAu bimetallic catalyst. According to the method, Cu and Au ingredients are simultaneously loaded on the carrier by one step by an ammonia evaporation method; the Cu and Au active ingredients are dispersed highly; the CuAu bimetallic catalyst with higher activity is obtained; the catalytic efficiency is improved; and a novel means is provided for preparing the high activity loaded CuAu bimetallic catalyst. The catalyst is applied to a reaction of ethylene carbonate catalytic hydrogenation for cogeneration of methanol and glycol; a conversion rate of ethylene carbonate can reach 100%; the selectivity of glycol can reach 100%; the selectivity of methanol can reach above 70%; and the catalyst shows an excellent catalytic performance.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a CuAu bimetallic catalyst and its preparation method and application. Background technique [0002] At present, the problem of environmental pollution is increasing day by day. Among them, the environmental pollution and greenhouse effect caused by carbon dioxide have attracted extensive attention of many scientific researchers at home and abroad. CO 2 It is the final product of carbon-containing compounds, the cheapest compound in the carbon family, and the most abundant carbon resource in nature. Therefore, research and development of CO 2 The comprehensive utilization of resources has very important economic value and practical significance. [0003] Methanol and ethylene glycol are two important products in the chemical industry. Methanol is known as "methanol economy" and has a wide range of uses. It is not only an important organic chemical raw material, a high-qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035B01J29/04C07C29/136C07C31/04C07C31/20
CPCY02P20/52B01J29/0356B01J29/044B01J2229/18C07C29/136C07C31/04C07C31/202
Inventor 王利国刘佳驹李会泉贺鹏曹妍陈家强
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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