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| ¡¡ Experimental Research on Catalysts and Their
Catalytic Mechanism for Hydrogen Production by Gasification of Peanut Shell in
Supercritical Water Abstract:Peanut shell, mixed with sodium carboxymethylcellulose, was gasified at
temperature of 450 ¡æ and at the pressure ranges from 24 MPa to 27 MPa with the presence
of different catalysts, including K2CO3, ZnCl2 and Raneyª²Ni.The
experimental results manifest that different catalysts have greatly different effects on
the reaction.From the view of hydrogen selectivity, ZnCl2 ranks first, K2CO3
second and Raneyª²Ni third.However, Raneyª²Ni is most favorable to gasify biomass,its
gasification efficiency reaches 126.84%, and it can earn 34.37 g hydrogen by gasifying 1
kg biomass. H2 selectivity increases and CH4 decreases rapidly when mixture of ZnCl2
and Raneyª²Ni is used at the same condition. The optimization mixture contains 0.2 g ZnCl2
in 1 g Raneyª²Ni,and its hydrogen production is 43.56 g·kg-1.In
addition, the catalytic mechanism of different catalysts was analysed, and the possible
reaction pathway was proposed to explain experimental phenomena and results correctly. |
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