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

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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 o

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
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Example Embodiment

[0079] Example 1

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

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

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

Example Embodiment

[0088] Example 2

[0089] Preparation of platinum nickel / carbon nanotube composite:

[0090] (1) Dissolve 0.31g of anhydrous nickel chloride in 30ml of water, add 50ml of 0.1M NaOH solution to form a precipitate, stir until the precipitation is complete, centrifuge and wash the precipitate into 100ml of 30wt% ammonia solution to obtain nickel ammonia Solution; Disperse 3g carbon nanotubes into 150ml ethanol, then add nickel ammonia solution dropwise, stir until complete reaction, heat to 80°C to completely volatilize ammonia and water to obtain a solid composite; disperse the solid composite in 100ml water, Add 50ml of 0.27M sodium borohydride solution dropwise under the protection of argon. After the reaction is complete, wash with centrifugal water and freeze-dry in vacuum to obtain 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 NaOH in ethylene glycol solution under room temperature s...

Example Embodiment

[0096] Example 3

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

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

[0099] (2) Dissolve 1g chlororhodium acid amine (Rh≥27.5%) in 50ml ethylene glycol, mix with 50ml 0.25M NaOH ethylene glycol solution under room temperature stirring, continue stirring for 30mi...

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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
CPCB01J23/8913B01J23/892B01J23/8926B01J35/0073B01J37/024B01J37/16B01J37/32C07C209/365C07C211/52
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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