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Preparation of supported gold-nickel alloy nanocatalyst

A gold-nickel alloy, supported technology is applied in the field of preparation of gold-nickel alloy nano-catalysts, and achieves the effects of narrow particle size distribution, metal consumption saving, and high catalytic activity.

Active Publication Date: 2013-02-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, there is no report on the preparation method of supported AuNi alloy nanoparticles

Method used

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  • Preparation of supported gold-nickel alloy nanocatalyst
  • Preparation of supported gold-nickel alloy nanocatalyst
  • Preparation of supported gold-nickel alloy nanocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] According to the synthetic method in the literature (Zhao, D.Y.; Huo, Q.S.; Feng, J.L.; Chmelka, B.F.; Stucky, G.D. Journal of the American Chemical Society 1998, 120, 6024-6036), SBA-15 with abundant hydroxyl groups on the surface was prepared. Under the condition of 40℃, dissolve 2g P123 in 15g water and 60g hydrochloric acid (2M) aqueous solution. After it is completely dissolved, under constant stirring, add 4.25g ethyl orthosilicate, continue stirring for 24h, put it into the reaction Crystallized in a kettle at 100°C for 48 hours, filtered, and dried to obtain white powder SBA-15.

[0039] Put 8g of SBA-15 into a dry three-necked flask, dry in an oven at 100°C for 2 hours, add 400mL of absolute ethanol after cooling down to room temperature, stir well, add 21.2mL of 3-aminopropyltriethoxysilane (99 %, Acros Organics) was refluxed at 80°C for 24 hours, and then the solid precipitate was filtered and washed with absolute ethanol until no blue flocculent precipitate was...

Embodiment 2

[0041] 8g SiO 2 Put it into a dry three-necked flask, dry in an oven at 100°C for 2 hours, add 400mL of absolute ethanol after cooling down to room temperature, stir well and add 21.2mL of 3-aminopropyltriethoxysilane (99%, Acros Organics) Reflux at 80°C for 24 hours, then filter the solid precipitate and wash with absolute ethanol until no blue flocculent precipitate is detected with copper nitrate. Then put the solid into an oven at 60°C for 6 hours to get the amino functionalized carrier SiO 2 -APTES.

Embodiment 3

[0043] Add 16 mL of deionized water and 6 mL of chloroauric acid aqueous solution containing 9.56 mg / mL gold to a 100 mL beaker, stir well at room temperature, and then add 1.1118 g SiO 2 -After APTES continues to stir for 30 minutes, it is filtered and washed with 1000 mL of deionized water. The obtained solid was re-dispersed in a 100 mL beaker containing 11 mL of deionized water, and 11 mL of a 0.2M sodium borohydride aqueous solution was added dropwise while stirring at room temperature. After stirring for 15 minutes, it was filtered and washed with 1000 mL of deionized water. The obtained solid was dispersed into 11mL deionized water and 0.2540g Ni(NO 3 ) 2 ·6H 2 In the beaker of O, add 30mL of 0.2M tert-butylammonium borane aqueous solution dropwise while stirring at room temperature, continue stirring for 15 minutes, filter and wash with 1000mL deionized water, dry at room temperature and put it in an oven at 80°C for 12 hours. The catalyst obtained at this time is denote...

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Abstract

The invention relates to preparation of supported gold-nickel alloy nanoparticles. The preparation comprises the following steps of: grafting a radical capable of complexing metal ions on a carrier which is rich in hydroxyl functional groups on the surface; complexing alloy and reducing to prepare gold nanoparticles; adsorbing nickel ions by using the gold nanoparticles as cores and catalyzing reduction of nickel together with a weak reducing agent; performing air roasting and hydrogen high-temperature treatment to obtain gold-nickel alloy nanoparticles, wherein the total metal weight supporting capacity of the catalyst is 0.1-10 percent, and the molar ratio of nickel to the gold is 0.001-5. According to the preparation, a nucleation center is provided for the nickel by the gold nanoparticles prepared by the first step and the reduction in the case of a weak reducing agent is catalyzed, the gold-nickel alloy nanoparticles with high thermal stability and high dispersion capacity are prepared on the carrier, and the average particle size is 3.5 nm. The catalyst shows higher activity than that of a single-metal gold catalyst in carbon monoxide reaction.

Description

Technical field [0001] The invention relates to the preparation of a gold-nickel alloy nano catalyst, in particular to the preparation of a supported gold-nickel alloy nano particle. Background technique [0002] Alloy catalysts have attracted more and more attention because of their superior activity and selectivity to single metal catalysts in many reactions. Since Haruta and others in Japan invented the preparation method of supported nano Au catalysts (JP60238148 and JP0194945), nano Au catalysts have been found to be low-temperature oxidation of carbon monoxide, selective oxidation of alcohols, propylene epoxidation and nitroaromatic olefins. It shows peculiar catalytic performance in reactions such as selective hydrogenation. Nickel catalysts show high activity in many hydrogenation reactions, such as aromatic hydrogenation and solvent naphtha hydrogenation (CN1415413). Recently, bulk AuNi alloys with pore-like structures prepared by electrochemical methods exhibited 3 ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J29/03B01J37/16B01J37/18C01B31/20C01B32/50
Inventor 卫星王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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