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cotton stalk activated carbon-supported co-ce-b nanoparticles as efficient catalysts for hydrogen generation through hydrolysis of sodium borohydride

引用

Carbon Resources conversion 2019年第3期2卷 225-232页

作者： Xiuli Zhang Chunhu Li Jianlin Qub Qingjie Guo Kelei Huang Key Laboratory of Marine Chemistry Theory and Engineering Technology of Ministry of Education College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100ShandongChina Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina

Porous cotton stalk activated carbons(CSAC)were prepared by phosphoric acid activation of cotton stalks in a fluidized bed.The CSAC-supported co-b and Co-Ce-B catalysts were prepared by the impregnation-chemical reduction method.The samples were characterized by the nitrogen adsorption,XRD,FTIR and TEM measurements.The effects of the sodium borohydride(NabH_(4))and sodium hydroxide(NaOH)concentrations,reaction temperature and recyclability on the rate of NabH_(4)hydrolysis over the CSAC-supported Co-Ce-B catalysts were systematically investigated.The results showed that the agglomeration of the co-ce-b nanoclusters on the CSAC support surface was significantly reduced with the introduction of cerium.The CSAC-supported Co-Ce-B catalyst exhibited superior catalytic activity and the average hydrogen generation rate was 16.42 L min^(−1)g^(−1)co at 25℃,which is higher than the most reported cobalt-based catalysts.The catalytic hydrolysis of NabH_(4)was zero order with respect to the NabH_(4)concentration,and the hydrogen generation rate decreased with the increase in the NaOH concentration.The activation energy of the hydrogen generation reaction on the prepared catalyst was estimated to be 48.22 kJ mol^(−1).A kinetic rate equation was also proposed.

关键词： Sodium borohydride Hydrogen Activated carbon Co-Ce-B catalyst Catalytic activity Kinetics

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