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Preparation method of Ru/C catalyst for preparing hydrogen by sodium borohydride hydrolysis

A technology for producing hydrogen by sodium borohydride and hydrolysis, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve the problem that the catalyst has short active life and cannot meet practical applications , active metal falling off and other problems, to achieve the effect of low cost, high yield and long active life

Inactive Publication Date: 2012-05-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is mainly limited by the strength of the carrier and the defects in the preparation method of the catalyst, so that the catalyst will fall off the active metal, sinter and crush the carrier during the long-term reaction, so the active life of the catalyst is very short, which cannot meet the practical application.

Method used

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  • Preparation method of Ru/C catalyst for preparing hydrogen by sodium borohydride hydrolysis
  • Preparation method of Ru/C catalyst for preparing hydrogen by sodium borohydride hydrolysis
  • Preparation method of Ru/C catalyst for preparing hydrogen by sodium borohydride hydrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Prepare 20ml of a mixed solution with ruthenium chloride concentration of 0.06mol / L and acetic acid concentration of 0.10mol / L, add 5.0g of spherical porous carbon carrier to the above solution, mix well at room temperature, and impregnate for 24h. Discard the impregnation solution, adjust the pH value of the remaining samples to 10 with 5% NaOH solution, raise the temperature to 70°C, slowly add a 10-fold excess sodium borohydride aqueous solution with a concentration of 0.05mol / L, and react at a constant temperature of 70°C for 3h, while hot The reactant was filtered, washed with deionized water several times, and dried under vacuum at 60° C. for 3 h to obtain the desired catalyst.

[0042] The BET curve and pore size distribution curve of the catalyst carrier used in the experiment are as follows: figure 1 and figure 2 . The product obtained in the experiment is a uniform spherical particle with a black surface, and its macroscopic photo is taken by a digital came...

Embodiment 2

[0045] Operate as in Example 1, but use 0.2 mol / L formaldehyde solution as the reducing agent, and the excess is 10 times. The deactivation curve of the catalyst prepared under this condition and the catalyst prepared in Example 1 in 10wt.% sodium borohydride solution is as follows Figure 9 . The deactivation curve of the catalyst prepared under this condition in 10wt.% and 15wt.% sodium borohydride solution is as follows Figure 10 .

Embodiment 3

[0047]Operate as in Example 1, change the reduction pH value to 11, and use 0.2 mol / L formaldehyde solution as the reducing agent, and the excess is 10 times. The deactivation curve of the catalyst prepared under this condition and the catalyst prepared in Example 2 in 10wt.% sodium borohydride solution is as follows Figure 11 .

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Abstract

The invention discloses a preparation method of an Ru / C catalyst for preparing hydrogen by sodium borohydride hydrolysis, belonging to the technical field of portable hydrogen preparation. The preparation method comprises the following step of preparing the Ru / C catalyst by mainly using porous carbon materials as a carrier and using impregnation reduction. The supported Ru / C catalyst with small metal particle sizes and even dispersion is prepared by adding an addition agent in steeping fluid, selecting a proper reducing agent and reducing a pH value. The Ru / C catalyst has large specific area and higher mechanical strength, does not have a breaking phenomenon in a reaction process basically, and displays relatively high reaction activity in the catalytic hydrolysis reaction of a sodium borohydride alkaline solution, meanwhile, the service life (in particular refer to the time of the conversion rate which is larger than 40 percent for catalyzing sodium borohydride to prepare hydrogen) of the catalyst exceeds 150 hours, and the Ru / C catalyst has a better application prospect in the field of portable hydrogen preparation. The preparation method has mild condition, low cost and high productive rate, is beneficial to industrial production, and can not cause environment pollution.

Description

technical field [0001] The invention belongs to the technical field of portable hydrogen production, and in particular relates to a preparation method of an efficient and long-lived sodium borohydride hydrolysis Ru / C catalyst for hydrogen production. Background technique [0002] As an energy source, hydrogen has attracted attention due to its high efficiency and environmental protection, and finding a suitable hydrogen storage method is the key to the effective use of hydrogen energy. At present, there are two main hydrogen storage methods that people study: physical method and chemical method. [0003] The physical methods mainly include: high-pressure steel cylinder storage and supply method, low-temperature liquefied hydrogen method, glass microsphere storage, activated carbon adsorption storage and transition metal hydride adsorption storage, etc. Compared with physical hydrogen storage, chemical method is an irreversible hydrogen storage method. At present, the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J21/18C01B3/06
CPCY02E60/36
Inventor 黄永民邹阅超刘洪来
Owner EAST CHINA UNIV OF SCI & TECH
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