二氧化硅负载钌催化剂催化氨硼烷水解产氢研究

doi:10.11962/1006-4990.2019-0398

Abstract

Abstract:

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

CLC Number:

TQ127.2

Sun Haijie,Liu Xingai,Chen Zhihao,Chen Lingxia,Li Congcong,Mei Yangyang. Research on Ru/SiO₂ catalysts for hydrogen generation from catalytic hydrolysis of ammonia borane[J]. Inorganic Chemicals Industry, 2020, 52(5): 81-85.

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References 18

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催化剂	活化能/ （kJ·mol^-1）	催化剂	活化能/ （kJ·mol^-1）
Ru/γ-Al₂O₃^[14]	67	Ru/Mico HAP^[17]	58
Ru/C^[15]	76	Ru/Ce（OH）CO₃^[18]	60
Ru/ Al₂O₃^[16]	48	Ru/SiO₂（本实验）	45

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Inorganic Acid-Base-Salt Committee of CIESC

Research on Ru/SiO₂ catalysts for hydrogen generation from catalytic hydrolysis of ammonia borane

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