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Non-alloyed metal complex and its preparation and application

A metal composite, non-alloy technology, applied in the preparation of amino compounds, the preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, etc., can solve the difficulty of adjusting the catalytic performance, changing the surface structure, and surface structure differences and other problems, to achieve the effect of excellent catalytic performance and strong tunability

Active Publication Date: 2017-07-04
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently synthesized metal composite catalysts are mainly alloy or core-shell structures. When adjusting the ratio of metal to metal, due to the different alloy ratios, the geometry of the alloy surface will change, resulting in a great difference in the surface structure, thus affecting Catalytic performance; at the same time, the Fermi energy levels between different metals are different, so charge transfer will occur. When the ratio is different, the degree of charge transfer is also different, and the role of metal-metal electrons will change accordingly, making it difficult to effectively control the catalytic performance.
The core-shell structure also has similar problems. When the ratio of core metal to shell metal is adjusted, the surface structure will be changed, which will lead to difficulties in adjusting the catalytic performance.

Method used

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  • Non-alloyed metal complex and its preparation and application
  • Non-alloyed metal complex and its preparation and application
  • Non-alloyed metal complex and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Preparation of platinum copper / activated carbon composite:

[0081] (1) Dissolve 0.32g of anhydrous cupric chloride in 30ml of water, add 50ml of 0.1M NaOH solution to generate a precipitate, stir until the precipitate is complete, centrifuge and wash with water and add the precipitate to 50ml of 28wt% ammonia solution to obtain a copper ammonia solution ; Disperse 3g of activated carbon into 150ml of ethanol, then add dropwise copper ammonia solution, stir until the reaction is complete, heat to 60°C to completely volatilize ammonia and water, and obtain a solid compound; disperse the solid compound in 100ml of water, under nitrogen protection Add 50ml of 0.27M sodium borohydride solution dropwise, centrifuge and wash with water after the reaction is complete, and vacuum freeze-dry to obtain a copper / activated carbon catalyst;

[0082] (2) Dissolve 1 g of chloroplatinic acid (Pt ≥ 37.0%) in 50 ml of ethylene glycol, mix it with 50 ml of 0.25 M NaOH in ethylene glycol u...

Embodiment 2

[0089] Preparation of platinum-nickel / carbon nanotube composites:

[0090] (1) Get 0.31g Anhydrous Nickel Chloride and be dissolved in 30ml water, the NaOH solution of the 50ml 0.1M that adds, generate precipitation, stir until precipitation is complete, after centrifugal washing, precipitation is added in the aqueous ammonia solution of 100ml 30wt%, obtains nickel ammonia solution; disperse 3g of carbon nanotubes into 150ml of ethanol, then dropwise add nickel ammonia solution, stir until complete reaction, heat to 80°C to completely volatilize ammonia and water to obtain a solid compound; disperse the solid compound in 100ml of water, Under the protection of argon, 50ml of 0.27M sodium borohydride solution was added dropwise, after the reaction was complete, it was centrifuged and washed with water, and vacuum freeze-dried to obtain a nickel / carbon nanotube catalyst;

[0091] (2) Dissolve 1g of chloroplatinic acid (Pt≥37.0%) in 50ml of ethylene glycol, mix with 50ml of 0.25M...

Embodiment 3

[0097] Preparation of rhodium-cobalt / carbon nanotube composites:

[0098] (1) Dissolve 0.285g of anhydrous cobalt chloride in 30ml of water, add 50ml of 0.1M KOH solution to generate a precipitate, stir until the precipitate is complete, and add the precipitate to 100ml of 25wt% ammonia solution after centrifugal washing to obtain cobalt ammonia solution ; Disperse 3g of carbon nanotubes in 150ml of ethanol, then dropwise add cobalt ammonium solution, stir until complete reaction, heat to 80°C to completely volatilize ammonia and water, and obtain a solid compound; disperse the solid compound in 100ml of water, argon Add dropwise 50ml of 0.27M hydrazine hydrate solution under air protection, centrifuge and wash with water after the reaction, and vacuum freeze-dry to obtain the cobalt / carbon nanotube catalyst;

[0099] (2) Dissolve 1g of ammonium chloride rhodium acid (Rh ≥ 27.5%) in 50ml of ethylene glycol, mix with 50ml of 0.25M NaOH in ethylene glycol solution under stirring...

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Abstract

The invention relates to a non-alloyed metal complex and its preparation and application. At least one of platinum, rhodium, ruthenium and iridium and at least one of copper, cobalt, nickel and silver contact with each other and are carried by a carrier which is any one of activated carbon, silica, titania, montmorillonite, a molecular sieve, carbon nanotubes and graphene so that the non-alloyed metal complex is obtained. The non-alloyed metal complex has a novel structure and is supported on the carrier in the form of metal-metal contact with each other. The non-alloyed metal complex has catalytic performances adjusted through change of a metal ratio, is simple and flexible and has strong adjustability. The non-alloyed metal complex has very high catalytic efficiency in catalysis of the selective reduction preparation of halogenated aniline from halogenated nitrobenzene. The non-alloyed metal complex has halogenated aniline selectivity higher than 95% and reaching 99% or more and has a good application prospect.

Description

technical field [0001] The invention relates to the field of preparation and application of nanometer materials, in particular to a non-alloy metal compound and its preparation method and application. Background technique [0002] Platinum group elements have a very broad application prospect in the field of catalysis, including catalytic cracking, catalytic hydrogenation and electrocatalysis. However, the catalytic properties of platinum group elements are too single to meet the needs of all catalytic reactions, especially when it comes to selective catalytic reactions. For example, when platinum catalyzes the selective reduction of halonitrobenzenes to haloanilines, it not only catalyzes hydrogen to reduce nitro functional groups to amine groups, but also catalyzes the dehalogenation side reaction of haloanilines. Other platinum group elements have similar catalytic properties to platinum, and the situation is similar to platinum. It is difficult to obtain good selectivi...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C209/36C07C211/52
CPCC07C209/365B01J23/8913B01J23/892B01J23/8926B01J37/024B01J37/16B01J37/32B01J35/396C07C211/52
Inventor 梁明会李鑫江鹏王悦刘永广魏航
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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