文献类型：期刊文献

英文题名：Application of coal gasification technology as a flue gas pre-conditioning step for the catalytic reduction of acid gases

作者：Fang, Ming[1]; Ma, Jianxin[2]; Lau, Ngai T[1]; Wang, Lei[2]; Qian, Shaosong[2]; To, King L[1]

机构：[1]Hong Kong Univ Sci & Technol, Inst Environm & Sustainable Dev, Hong Kong, Hong Kong, Peoples R China;[2]E China Univ Sci & Technol, Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2002

卷号：87

期号：3

起止页码：395

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：2002397104508);WOS:【SCI-EXPANDED(收录号:WOS:000177584300012)】；

语种：英文

外文关键词：coal gasification; flue gas; lanthanum oxysulfide; sulfur dioxide; nitric oxide

摘要：Typical flue gas contains an excess amount of oxygen, which can deactivate the reduction catalyst for NOx and SO2, such as the lanthanum oxysulfide-based catalyst. The reductant available in a flue gas stream rich in oxygen is usually scarce and not sufficient for the reduction. Coal gasification was applied to pre-condition the flue gas to remove the excessive oxygen and co-generate carbon monoxide for the reduction of NOx and SO2 in this study. Coal was carbonized to porous semi-coke to prevent clogging caused by the condensation of volatiles before being gasified. The reactivity of the semi-coke with simulated flue gas was found to be the same as activated carbon. The semi-coke samples prepared from various coal sources proved to be effective in removing O-2 (over 90%) from the flue gas and a sufficient amount of CO was co-generated for the conversion of NO and SO2 over a supported lanthanum oxysulfide catalyst in a subsequent reduction reactor. NO and SO2 in the flue gas were also reduced in the gasification process, contributing to the overall denitrification and desulfurization efficiency. An overall NO and SO2 removal efficiency of over 96% was achieved for a sequential coal gasification and catalytic reduction process, and the selectivity to elemental sulfur was as high as 98%. (C) 2002 Elsevier Science B.V. All rights reserved.