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Supported gold-platinum duplex metal alloy catalyst and preparation method and application thereof

A technology of bimetallic catalysts and alloy catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult to synthesize azobenzene and harsh reaction conditions and other problems, to achieve the effect of controllable alloy composition ratio, good repeatability and improved stability

Inactive Publication Date: 2014-01-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing supported noble metal catalysts often require harsh reaction conditions in the process of reducing nitrobenzene, and it is difficult to directly synthesize azobenzene with high selectivity. Most of the products are aniline, azobenzene, and hydrogenated azobenzene. mixture of compounds

Method used

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  • Supported gold-platinum duplex metal alloy catalyst and preparation method and application thereof
  • Supported gold-platinum duplex metal alloy catalyst and preparation method and application thereof
  • Supported gold-platinum duplex metal alloy catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Au(0.5)-Pt(0.1) / SiO 2 Catalyst preparation

[0025] Step 1. Preparation of silica carrier: Mix 10g APTES (3-aminopropyltriethoxysilane) and 100ml deionized water evenly, then add 2ml HCHO solution under stirring, continue to stir and hydrolyze for 12h, and then dissolve the obtained The white suspension was filtered and washed, and dried at 200° C. for 4 hours to obtain a silica carrier with reducing functional groups.

[0026] Step 2, preparation of the gold-platinum bimetallic alloy catalyst supported by silica: 5.23mg HAuCl 4 4H 2 O and 1.33 mg H 2 PtCl 6 ·6H 2 O was dissolved in 75ml of deionized water, and after stirring evenly, 0.5g of the silica carrier prepared in step 1 was added, and then refluxed at 110°C for 2h. )-Pt(0.1) / SiO 2 Bimetallic alloy catalyst.

Embodiment 2

[0027] Example 2: Au(0.5)-Pt(0.3) / SiO 2 Catalyst preparation

[0028] Step 1. Preparation of silica carrier: Mix 10g APTES (3-aminopropyltriethoxysilane) and 100ml deionized water evenly, then add 2ml HCHO solution under stirring, continue to stir and hydrolyze for 12h, and then dissolve the obtained The white suspension was filtered and washed, and dried at 200° C. for 4 hours to obtain a silica carrier with reducing functional groups.

[0029] Step 2, preparation of the gold-platinum bimetallic alloy catalyst supported by silica: 5.23mg HAuCl 4 4H 2 O and 3.98 mg H 2 PtCl 6 ·6H 2 O was dissolved in 75ml of deionized water, after stirring evenly, 0.5g of the silica carrier prepared in step 1 was added, then refluxed at 110°C for 2h, after cooling to room temperature, it was filtered and washed with water, and dried at 120°C overnight to obtain Au (0.5 )-Pt(0.3) / SiO 2 Bimetallic alloy catalyst.

Embodiment 3

[0030] Embodiment 3: Au(0.5)-Pt(0.5) / SiO 2 Catalyst preparation

[0031] Step 1. Preparation of silica carrier: Mix 10g APTES (3-aminopropyltriethoxysilane) and 100ml deionized water evenly, then add 2ml HCHO solution under stirring, continue to stir and hydrolyze for 12h, and then dissolve the obtained The white suspension was filtered and washed, and dried at 200° C. for 4 hours to obtain a silica carrier with reducing functional groups.

[0032] Step 2, preparation of the gold-platinum bimetallic alloy catalyst supported by silica: 5.23mg HAuCl 4 4H 2 O and 6.64 mg H 2 PtCl 6 ·6H 2O was dissolved in 75ml of deionized water, and after stirring evenly, 0.5g of the silica carrier prepared in step 1 was added, and then refluxed at 110°C for 2h. )-Pt(0.5) / SiO 2 Bimetallic alloy catalyst.

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Abstract

The invention discloses a supported gold-platinum duplex metal alloy catalyst and a preparation method and application thereof. The carrier of the catalyst is silicon dioxide with the surface functionalized, the alloy of metal Au and metal Pt is loaded on the surface of the carrier, the load rate of the alloy is 0.6-2.5wt%, and the mass ratio of Au to Pt is 5:1-20:1. The gold-platinum duplex metal alloy catalyst is successfully prepared through an in-site reduction method, the catalyst is simple to prepare, and the proportion of the components is controllable. When the reaction is carried out for 40 minutes at 50 DEG C in 0.8MPa hydrogen, the productive rate of azobenzene is over 90%. The reaction process is environment-friendly and does not need such reagents seriously contaminating the environment as nitrite. Compared with the reported supported catalysts, the supported gold-platinum duplex metal alloy catalyst has higher activity; compared with precious metal catalysts such as pure platinum or palladium catalyst, the supported gold-platinum duplex metal alloy catalyst greatly improves the use ratio of precious metals, is easy to separate and recycle after reaction, is small in loss, and is more suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a silicon dioxide-loaded gold-platinum bimetallic alloy catalyst prepared by an in-situ reduction method. The invention also relates to the above-mentioned catalyst being used in the reaction of preparing azobenzene and its derivatives through hydrogenation of nitrobenzene compounds. Background technique [0002] Aromatic azo compounds are an important class of raw materials widely used in industrial organic dyes, food additives, initiators of free radical reactions and therapeutic drugs. At present, the methods for synthesizing azobenzene compounds mainly include: (1) oxidation of aromatic amines, (2) reduction of nitro-containing aromatic compounds, and (3) coupling of diazotized aniline with electron-rich aromatic compounds The diazotization method of the reaction (J.Org.Chem., 1998, 63, 4503) and so on. At present, the industry mainly uses the third method to produce azobenzene. Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C07C245/08
Inventor 王新葵刘清港王利陈成梁长海
Owner DALIAN UNIV OF TECH
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