文献类型：期刊文献

英文题名：Steam gasification of coal char catalyzed by K₂CO₃ for enhanced production of hydrogen without formation of methane

作者：Wang, Jie[1];Jiang, Mingquan[1];Yao, Yihong[1];Zhang, Yanmei[1];Cao, Jianqin[1]

机构：[1]E China Univ Sci & Technol, Dept Chem Engn Energy, Shanghai 200237, Peoples R China

年份：2009

卷号：88

期号：9

起止页码：1572

外文期刊名：FUEL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000267531100006)】；

基金：This study is sponsored by the National "863" Scientific Research Program (Contract No. 2006AA05Z116). The first author expresses thanks to the Program for Changjiang Scholars and Innovative Research Team in University in China (IRT0620).

语种：英文

外文关键词：Coal char; Hydrogen; Steam gasification; Catalysis; Potassium carbonate

摘要：Steam gasification of coal char catalyzed by potassium carbonate was investigated on a laboratory fixed-bed reactor to examine the catalytic effects not only on the reaction rate but also on the reaction selectivity, and non-catalytic gasification of coal char was performed by way of contrast. It was observed that the catalytic gasification of coal char with steam occurred significantly in a temperature range of 700-750 degrees C, producing a hydrogen-rich gas with slight formation of carbon monoxide and virtually no formation of methane. An oxygen transfer and intermediate hybrid mechanism of the catalytic char gasification with steam is proposed for understanding of the experimental data regarding both the kinetic behaviors and reaction selectivity. The study has highlighted the advantages of the catalytic gasification of coal char over the conventional coal gasification with respect to the reaction selectivity. The catalytic steam gasification of coal char makes it possible to eliminate or simplify the methane reforming and water-gas shift processes in the traditional gas-to-hydrogen purification system. (C) 2008 Elsevier Ltd. All rights reserved.