关键词: 氨硼烷, 制氢, 水解, 纳米材料, 催化作用

Abstract:

The Ru/WC-C catalyst was prepared by dispersing Ru on the WC-C support, and its catalytic performance in hydrogen generation from ammonia borane hydrolysis was tested. The phase structure, morphology and surface element state of the catalyst were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The results showed that Ru nanoparticles were evenly scattered on the surface and surroundings of WC, and the electronic synergy effect between the Ru and WC promoted the hydrogenation of ammonia and hydrolysis of ammonia. Under the condition of 298 K and alkaline solution environment, the hydrolysis performance of ammonia borane was related to the Ru content. With the increase of Ru content, the hydrogen production time was shortened. The completed hydrogen production time of 2%Ru/WC-C catalyst with a Ru mass fraction of 2% was 3.5 min, and its hydrogen generation rate value was 573.0 min^-1 with activation energy of 45.3 kJ·mol^-1. Moreover, its hydrogen generation rate value in the neutral aqueous solution was still as high as 136.2 min^-1. The application of WC-C carrier can effectively promote the activation of water molecules during the reaction, and then improve the catalytic performance of Ru catalyst. This study provides a new insight for the development of low-cost and efficient catalyst for hydrogen production from ammonia borane hydrolysis.

Key words: ammonia borane, hydrogen production, hydrolysis, nanomaterials, catalysis