文献类型：会议论文

英文题名：Biogas reforming for hydrogen production over nickel and cobalt bimetallic catalysts

作者：Xu, Junke[3,4];Zhou, Wei[1,3];Li, Zhaojing[2];Wang, Jihui[2];Ma, Jianxin[1,3]

机构：[1]Tongji Univ, Sch Automot Studies, Shanghai 201804, Peoples R China;[2]E China Univ Sci & Technol, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[3]Tongji Univ, Clean Energy Automot Engn Ctr, Shanghai 201804, Peoples R China;[4]Tongji Univ, Sch Environm Sci & Engn, Shanghai 200092, Peoples R China

会议论文集：4th Dubrovnik Conference on Sustainable Development of Energy, Water and Environment Systems

会议日期：APR, 2007

会议地点：Dubrovnik, CROATIA

语种：英文

外文关键词：Biogas reforming; Hydrogen production; Bimetallic catalyst; Nickel; Cobalt

摘要：Ni/Co bimetallic catalysts supported by commercial gamma-Al2O3 modified with La2O3 for biogas reforming were prepared by conventional incipient wetness impregnation. The catalysts were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), BET surface area and porosity analysis (BET), H-2 temperature-programmed reduction (H-2-TPR), transmission electron microscopy (TEM) and thermogravimetry coupled to differential scanning calorimetry (TG-DSC). XRD and XPS analysis revealed that a Ni/Co alloy was formed in the bimetallic catalysts. The Ni/Co ratio could be adjusted to improve pore textural properties, which enhanced the metal particle dispersion and resulted in smaller metal particle size, and thus increased the catalytic activity and resistance to carbon deposition. The activity and stability of the catalysts for biogas reforming was tested at 800 degrees C, ambient pressure, GHSV of 6000 ml g(cat)(-1) h(-1) and a CH4/CO2 molar ratio of 1 without dilute gas. Experimental results showed that the catalytic activity could be closely related to the Ni/Co ratio. The bimetallic catalyst 7Ni3Co/LaAl exhibited better catalytic and anti-coking performance due to smaller metal particles, higher metal dispersion, uniform pore distribution, surface enrichment of Co, as well as the synergetic effect between Ni and Co. During a 290 h stability test over the catalyst 7Ni3Co/LaAl, the average conversion of CH4 and CO2, selectivity to H-2 and CO, and ratio of H-2/CO were 93.7%, 94.0%, 94.9%, 97.8%, and 0.97, respectively. The average coking rate was 0.0946 mg g(cat)(-1) h(-1). (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.