Effects of Ca-Based Catalysts on Biomass Gasification with Steam in a Circulating Spout-Fluid Bed Reactor

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• 作者：Yurong Xie ; Jun Xiao ; Laihong Shen ; Jun Wang ; Jing Zhu ; Jiangang Hao
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：May 20, 2010
• 年：2010
• 卷：24
• 期：5
• 页码：3256-3261
• 全文大小：879K
• 年卷期：v.24,no.5(May 20, 2010)
• ISSN：1520-5029

文摘

The catalytic performances of natural Ca-based catalysts (dolomite and limestone) and synthetic Ca-based catalysts, used for improving biomass steam gasification, were fully investigated in a circulating spout-fluid bed reactor. In comparison to the catalytic role in biomass gasification, the synthetic Ca-based catalyst, 20% CaO/Al₂O₃ (20CaAl), displayed a better catalytic effect on the biomass carbon conversion reaction and tar reforming reaction than natural Ca-based catalysts, but the latter played a better role in the reforming reaction of light hydrocarbon because it contained small quantities of iron oxides. For the two types of Ca-based catalysts, the optimal operating temperature was about 860 °C to upgrade the quality of gas product and increase H₂ yield. The catalytic activity of synthetic Ca-based catalysts was visibly improved with the increment of CaO loading, and the preferential range of CaO loading was 12.5−20%. In comparison to the lifetime, 20CaAl (the synthetic catalyst) displayed better stability in the catalytic role than natural Ca-based catalysts.