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Catalyst for catalytically hydrolyzing sodium borohydride to prepare hydrogen and preparation method thereof

A technology for catalyzing sodium borohydride and sodium borohydride, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Introduce problems such as surfactant residues and catalytic effects, to achieve good surface wettability, reduce catalyst costs, and low prices

Active Publication Date: 2011-04-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to prevent the obtained nanoparticles from agglomerating, it is generally necessary to add surfactants during preparation, but the addition of surfactants has an impact on the catalytic effect, and surfactant residues may be brought into the system after the reaction; in addition, metal nanoparticles and silicon oxide The binding ability of the particles is changed by the properties of the metal nanoparticles, and there is a problem that the adhesion rate of the metal particles on the surface is not high

Method used

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  • Catalyst for catalytically hydrolyzing sodium borohydride to prepare hydrogen and preparation method thereof

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preparation example Construction

[0019] The present invention also designs a catalyst preparation method for catalyzing the hydrolysis of sodium borohydride to produce hydrogen (hereinafter referred to as the preparation method). The preparation method adopts an in-situ reduction method. The specific implementation process steps are as follows:

[0020] (1) Preparation of silica carrier: first make 5-25ml of 28wt% ammonia water and 175-195ml of ethanol into a mixed solution, then add 2-20ml of ethyl orthosilicate to the mixed solution and stir to react After 6-20 hours, a silica carrier particle suspension is prepared; then the silica carrier particles in the suspension are precipitated on the bottom of the container by centrifugal separation, the upper liquid is removed, distilled water is added again, and the silica carrier particles deposited at the bottom are ultrasonically dispersed , The centrifugal separation is repeated 2-4 times, until the pH of the suspension is 7-8;

[0021] (2) Coated nickel or nickel ...

Embodiment 1

[0035] Preparation of metal-silica composite catalyst particles.

[0036] (1) Take 5ml of 28wt% ammonia and 195ml of ethanol, add 5ml of ethyl orthosilicate, stir and react for 10 hours to obtain a silica particle suspension; the obtained silica particles are separated by centrifugal separation to precipitate the silica particles At the bottom of the container, remove the upper liquid, re-add distilled water, ultrasonically disperse the particles at the bottom, repeat 3 times, until the pH of the suspension is 7-8.

[0037] (2) Take 100 ml of the silicon oxide suspension solution, add 10 ml of the precursor of the aqueous solution of the metal salt (including platinum chloric acid, silver nitrate, nickel chloride or cobalt chloride, etc.) of 10 mmol / L, and stir and mix well. After adding excess reducing agent sodium borohydride to react, a composite catalyst suspension solution of each metal (platinum, silver, nickel, cobalt, etc.) nanoparticles coated with silicon oxide particles ...

Embodiment 2

[0040] Preparation of nickel boride-silicon oxide composite catalyst suspension.

[0041] (1) Mix 10 ml of 28wt% ammonia water with 180 ml of ethanol, add 10 ml of ethyl orthosilicate, stir and react for 12 hours to obtain a silica particle suspension; the obtained silica particle suspension is centrifuged to separate the silica particles Precipitate at the bottom of the container, remove the upper layer of liquid, re-add distilled water, ultrasonically disperse the particles precipitated at the bottom, repeat 4 times until the pH of the suspension is 7.

[0042] (2) Add 30 ml of 10 millimoles per liter of nickel chloride solution to 100 ml of silica suspension solution, stir and mix uniformly, add excess reducing agent sodium borohydride, and obtain a composite catalyst coated with NiB nanoparticles after the reaction suspension.

[0043] Take 1 ml of the above composite catalyst suspension and add it to 50 ml of an aqueous solution containing 75 millimoles of sodium borohydride, a...

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Abstract

The invention discloses a catalyst for catalytically hydrolyzing sodium borohydride to prepare hydrogen and a preparation method thereof. The catalyst is characterized in that the catalyst is a composite catalyst formed by taking silicon oxide as the carrier and coating more than one metal nanoparticle layers on the carrier; the diameter of the silicon oxide particle is 100-1000nm; the metal nanoparticle is nickel or nickel boride; the diameter of the metal nanoparticle is 10-200nm; and the mass of the metal nanoparticle is 5-50% that of the carrier. The preparation method comprises the following steps: 1, preparing the silicon oxide carrier: firstly preparing defined amount of ammonia water and ethanol into mixed liquor, then adding tetraethoxysilane to the mixed liquor and stirring the mixture to react to prepare silicon oxide carrier particle suspension; and 2, coating the nickel or nickel boride metal nanoparticle: taking 100ml of silicon oxide suspension, adding defined amount ofmetal salt solution to the suspension, after stirring and uniform mixing, adding excessive reducing agents for reaction, thus obtaining nickel or nickel boride-silicon oxide catalyst suspension.

Description

Technical field [0001] The invention relates to catalyst technology, in particular to a catalyst for catalyzing the hydrolysis of sodium borohydride to prepare hydrogen and a preparation method thereof. Background technique [0002] Hydrogen is a clean and environmentally friendly secondary energy source with a wide range of sources. Hydrogen can be obtained by natural gas reforming, coal gasification, biomass cracking and gasification, electrolysis and photolysis of water, and hydrolysis of chemical hydrides and borohydrides. Natural gas reforming is currently the cheapest and most effective hydrogen production method, but it consumes natural gas, a non-renewable natural resource. Although the method of producing hydrogen by electrolysis of alkaline aqueous solution has been commercialized, it is difficult to generalize due to its low energy utilization effect. Efficient hydrogen production can be prepared by electrolyzing water with photovoltaic polymer electrolyte membranes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C01B3/06
CPCY02E60/36
Inventor 陈英波
Owner TIANJIN POLYTECHNIC UNIV
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