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Preparation of supported gold-nickel alloy nanocatalyst

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

Active Publication Date: 2014-07-02
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] SBA-15 with abundant hydroxyl groups on the surface was prepared 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). At 40°C, dissolve 2g of P123 in an aqueous solution of 15g of water and 60g of hydrochloric acid (2M). After complete dissolution, add 4.25g of tetraethyl orthosilicate under constant stirring, continue stirring for 24h, and put into the reaction Crystallize in a kettle at 100°C for 48h, filter and dry to obtain white powder SBA-15.

[0039] Put 8g of SBA-15 into a dry three-necked flask, and dry it in an oven at 100°C for 2 hours. %, 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 detected with copper nitrate. Afterwards, the solid was dried in an oven at 60° C. for 6 hours to obtain the amino-functionalized ...

Embodiment 2

[0041]8g SiO 2 Put it into a dry three-necked flask, dry it 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 aminotriethoxysilane (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. Afterwards, the solid was dried in an oven at 60°C for 6 hours to obtain the amino-functionalized carrier SiO 2 -APTES.

Embodiment 3

[0043] Add 16mL of deionized water and 6mL of chloroauric acid aqueous solution containing 9.56mg / mL of gold into a 100mL beaker, stir well at room temperature and then add 1.1118g of SiO 2 - After APTES continued to stir for 30 minutes, it was filtered and washed with 1000 mL of deionized water. The obtained solid was redispersed into a 100 mL beaker filled with 11 mL of deionized water, 11 mL of 0.2M aqueous sodium borohydride solution was added dropwise while stirring at room temperature, stirring was continued for 15 minutes, then filtered and washed with 1000 mL of deionized water. The obtained solid was dispersed into a solution containing 11 mL of deionized water and 0.2540 g of Ni(NO 3 ) 2 ·6H 2 In a beaker of O, add dropwise 0.2M tert-butylaminoborane aqueous solution 30mL while stirring at room temperature, continue to stir 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 catalyzer...

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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 loaded gold-nickel alloy nano particle. Background technique [0002] Alloy catalysts have attracted more and more attention because of their superior activity and selectivity over single metal catalysts in many reactions. Since Japan's Haruta et al. invented the preparation method of supported nano-Au catalysts (JP60238148 and JP0194945), nano-Au catalysts have been found to be effective in low-temperature oxidation of carbon monoxide, selective oxidation of alcohols, propylene epoxidation and nitroaromatic olefins. It exhibits unique catalytic performance in reactions such as selective hydrogenation. Nickel catalysts show high activity in many hydrogenation reactions, such as aromatic hydrocarbon hydrogenation and solvent oil hydrogenation (CN1415413). Recently, bulk AuNi alloys with porous structures prepared by electrochemical meth...

Claims

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Application Information

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Patent Type & Authority Patents(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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