Hydrogen production by biomass gasification in supercriticor subcritical water with Raney-Ni and other catalysts

作     者：Aixia PEI Lisheng ZHANG Bizheng JIANG Liejin GUO Ximin ZHANG Youjun LV Hui JIN 

作者机构：Zhongyuan Petroleum Company Puguang Natural Gas Treating PlantSinopec Dazhou 636156 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China 

出 版 物：《中国高等学校学术文摘·能源与动力工程》 (FRONTIERS OF ENERGY AND POWER ENGINEERING IN CHINA)

年 卷 期：2009年第3卷第4期

页      面：456-464页

核心收录：

学科分类：080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：This work was supported by the State Key Develop-ment Program for Basic Research of China(2003CB214500) 国家自然科学基金(50521604) 

主　　题：biomass catalyst gasification Raney-Ni supercritical water hydrogen 

摘      要：Gasification of peanut shell, sawdust and straw in supercritical or subcritical water has been studied in a batch reactor with the presence of a series of Raney-Ni and its mixture with ZnCl2 or Ca(OH)2. The main gas products were hydrogen, methane, carbon dioxide, and a small amount of carbon monoxide. Different types of Raney-Ni, containing different metal components such as Fe, Mo or Cr, have different influences on the gasification yield and hydrogen selectivity. The catalysis effect can be improved obviously by adding ZnCl2 or Ca(OH)2 Increasing the reaction temperature or adding ZnCl2 and Ca(OH)2 could improve the mass of H2 in gas products and reduce the mass of CH4 and CO2 at the same time. The possible mechanism is that ZnCl2 can decompose the biomass particle by accelerating cellulose hydrolyzation in high-temperature water, increasing more specific surface to admit catalysts, while Ca(OH)2 can absorb CO2 to produce CaCO3 deposit, which can drop out from the reactant system, and which will drive the reaction to get more hydrogen. With respect to the biomass conversion to gas product and selectivity of H2 at low temperature, the series of Raney-Ni has shown many advantages over other catalysts; thus, this kind of catalyst has great potential to be utilized in the hydrogen industry for the gasification of biomass.