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Research on Ru/SiO2 catalysts for hydrogen generation from catalytic hydrolysis of ammonia borane
Received date: 2019-11-24
Online published: 2020-05-21
Ru/SiO2 catalysts were synthesized via an impregnation-reduction method.The effect of Ru loading amount,amount of NaBH4 as the reducing agent,reduction temperature as well as the reaction conditions was investigated on the hydrogen generation from hydrolysis of BH3NH3 over Ru/SiO2 catalyst.Results showed that when Ru/SiO2 was prepared under the condi-tions as follows: Ru loading amount was 0.1%（mass fraction）,n（NaBH4）∶n（Ru）=2.2∶1 and reduction temperature was 303 K,the highest catalytic activity towards hydrogen generation from hydrolysis of BH3NH3 was observed and the turnover frequency （TOF） reached up to 140.8 L/（mol·min）,the volume-to-molar ratio of H2 to Ru .When stirring speed reached 450 r/min,the highest BH3NH3 adsorption rate was observed,leading to the highest reaction rate of hydrogen generation.Further,hydrolysis of BH3NH3 was controlled by the surface reaction of catalyst,and the catalytic activity towards hydrogen production increased with enhancing the amount of used catalyst.With increasing the reaction temperature,the activation energy of BH3NH3 was enhanced over Ru,resulting in the improvement of reaction rate.According to the kinetic study,H2 production from the hydro-lysis of BH3NH3 over Ru/SiO2 was a zero order reaction against the concentration of BH3NH3,and the Eawas 45 kJ/mol.
Key words： Ru; SiO2; BH3NH3; H2 generation
Haijie Sun , Xingai Liu , Zhihao Chen , Lingxia Chen , Congcong Li , Yangyang Mei . Research on Ru/SiO2 catalysts for hydrogen generation from catalytic hydrolysis of ammonia borane[J]. Inorganic Chemicals Industry, 2020 , 52(5) : 81 -85 . DOI: 10.11962/1006-4990.2019-0398
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