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Study on hydrolysis H2 production from NaBH4 catalyzed by CoB/SiO2 catalyst under self-stirring
Received date: 2019-09-15
Online published: 2020-03-31
CoB/SiO2 catalyst was synthesized via impregnation-chemical reduction method,and the performance of hydrolysis H2 production from NaBH4 catalyzed by CoB/SiO2 catalyst was researched.The effect of factors,such as the particle size of SiO2,the amount-of-substance ratio of cobalt nitrate to SiO2 and the amount-of-substance ratio of cobalt nitrate to NaBH4,on the performance of catalyst was investigated.In addition,the conditions of dosage of catalyst,stirring speed rate and reaction temperature etc.on the performance of hydrolysis H2 production from NaBH4 were further studied.Results showed when the particle size of SiO2 was 15 nm,the amount-of-substance ratio of cobalt nitrate to SiO2 was 0.08∶1,and the amount-of-substance ratio of cobalt nitrate to NaBH4 was 1∶5,the speed rate of hydrolysis H2 production from NaBH4 catalyzed by CoB/SiO2 catalyst was 45.6 mL/(min·g).Because the particle size of the catalyst was very small,the effect of the external diffusion rate could be completely eliminated by the momentum generated in the hydrolysis H2 production from NaBH4.The effect of the stirring speed on the hydrolysis rate of NaBH4 was small.The hydrolysis rate of NaBH4 increased with the increase of the dosage of catalyst.With the increasing of the reaction temperature,the hydrolysis rate increased,the apparent activation energy of the hydrolysis reaction of NaBH4 was 48.54 kJ/mol,and the reaction order of NaBH4 was zero.The catalyst showed the excellent reusability and stability.
Key words: CoB/SiO2 catalyst; NaBH4; H2 generation
Haijie Sun , Zhihao Chen , Lingxia Chen , Cong Liu , Ranran Liu , Wenjuan Cai . Study on hydrolysis H2 production from NaBH4 catalyzed by CoB/SiO2 catalyst under self-stirring[J]. Inorganic Chemicals Industry, 2020 , 52(3) : 101 -106 . DOI: 10.11962/1006-4990.2019-0252
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