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Metal boride catalyst with high activity to hydrogen and its preparing method

A technology of metal borides and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as expensive

Inactive Publication Date: 2007-05-09
国家高技术绿色材料发展中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since these noble metal catalysts are expensive, it is necessary to look for catalysts with relatively low prices.

Method used

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  • Metal boride catalyst with high activity to hydrogen and its preparing method

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Experimental program
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Effect test

Embodiment 1

[0020] Take 3mol / l CoCl 2 100ml of the solution was placed in a flask, and then 200ml of 5% NaBH 4 The solution was added to the flask; the solution in the flask was mechanically stirred during this process. After the reaction, the mechanical stirring was stopped, and the suspension was separated into layers. Remove the supernatant; take out the lower precipitate, wash with deionized water, and filter until AgNO is added dropwise to the eluate. 3 The solution no longer produces a white precipitate. The above suction-filtered precipitate was vacuum-dried at 50° C. for 72 hours to obtain an amorphous product. The chemical composition of the obtained metal boride is Co 2.49 b.

[0021] In order to detect the dehydrogenation activity of metal borides, a certain amount of NaBH 4 The solution is placed in the reactor, and then a certain amount of the above-mentioned metal borides are added to the reactor, and NaBH 4 The solutions are in full contact; the hydrogen gas produced...

Embodiment 2

[0023] Take 5mol / l CoCl 2 Solution 100ml, placed in a flask, then 500ml concentration of 5% NaBH 4 The solution was added to the flask; the solution in the flask was sonicated during this process. After the reaction, the ultrasonic oscillation was stopped to separate the layers of the suspension. Remove the supernatant; take out the lower precipitate, wash with deionized water, and filter until AgNO is added dropwise to the eluate. 3 The solution no longer produces a white precipitate. The above suction-filtered precipitate was vacuum-dried at 160° C. for 72 hours to obtain an amorphous product. The chemical composition of the obtained metal boride is Co 2.08 b.

[0024] The dehydrogenation activity of the metal boride was detected by the method described in Example 1, and the dehydrogenation efficiency of the above metal boride was measured to be 95%.

Embodiment 3

[0026] Take 8mol / l NiCl 2 Solution 150ml, placed in a flask, then 500ml concentration of 10% NaBH 4 The solution was added to the flask; the solution in the flask was mechanically stirred during this process. After the reaction, the mechanical stirring was stopped, and the suspension was separated into layers. Remove the supernatant; take out the lower precipitate, wash with deionized water, and filter until AgNO is added dropwise to the eluate. 3 The solution no longer produces a white precipitate. The above suction-filtered precipitate was vacuum-dried at 90° C. for 84 hours to obtain an amorphous product, whose X-ray diffraction spectrum is shown in curve (a) in the accompanying drawing.

[0027] The dehydrogenation activity of the metal boride was detected by the method described in Example 1, and the dehydrogenation efficiency of the above metal boride was measured to be 96%.

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Abstract

The present invention belongs to the field of hydrogen preparation and energy source technology, and provides a kind of metal boride catalyst with dehydrogenation and hydrogenation characteristic. The metal boride catalyst has the general expression of MxB, where, M is Al, Zr, V, Cr, Co or other metal elements or their combination, and x is 1-4. Into the metal boride, O and / or H may be combined chemically or physically. The catalyst has low cost, excellent hydrogenation activity, and dehydrogenation efficiency up to 96 %. The preparation process of the metal boride catalyst is also provided, and the preparation process includes chemical reaction inside solution to prepare precursor and subsequent two stages of heat treatment. The preparation process is simple and suitable for large scale production.

Description

technical field [0001] The invention belongs to the technical field of hydrogen preparation and energy, and provides a metal boride catalyst with high activity to hydrogen and a preparation method thereof. Background technique [0002] As a renewable secondary energy source, hydrogen has a high calorific value and a fast reaction speed. It can be obtained through a variety of reaction pathways, can be stored in gaseous or liquid state, and can be stored in solid compounds. Therefore, various economic methods can be adopted. The way to effectively transport, adapt to various industrial needs. The by-product of hydrogen after releasing energy is water, which is an environmentally friendly process. At present, hydrogen energy is being researched and applied more and more, but its research and development is of great significance for solving the energy problems faced by human beings in sustainable development. Through the power generation method of fuel cells, hydrogen can be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/02
Inventor 吴川吴锋陈实单忠强先毅
Owner 国家高技术绿色材料发展中心
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