文献类型：期刊文献

英文题名：Desulfurization mechanism of iron-manganese compound oxide desulfurizer for removal of COS from coal gas

作者：Wang, Fang-Fang[1]; Zhao, Hai[1]; Zhang, De-Xiang[1]; Gao, Jin-Sheng[1]

机构：[1] School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2008

卷号：33

期号：2

起止页码：197

外文期刊名：Meitan Xuebao/Journal of the China Coal Society

收录：EI(收录号：20081911244448)

语种：英文

外文关键词：Atmospheric pressure - Coal gas - Energy dispersive spectroscopy - Hydrogenation - Manganese compounds - Removal - Scanning electron microscopy - Sorbents

摘要：The sorbent, atmosphere and components of outlet gas were analyzed by mass spectra, XRD, SEM, EDS etc. Desulfurization performance of sorbents is commendable at 240-400°C, atmospheric pressure and space speed of 500-2000 h-1. The possible mechanism of desulfurization reactions was obtained by analyzing the reduction-adsorption-sulfidation process. COS was converted to H2S by hydrogen in strongly reducing atmosphere firstly. Then H2S was adsorbed on the surface of desulfurizers, reacted with active components, and transformed metal sulfides and water. At the atmosphere without carbonaceous oxide, efficiency of removal of carbonyl sulfur is better than that of the atmosphere with carbonaceous oxide in test conditions. The existence of carbonaceous oxide restrains hydrogenation and hydrolytic process of COS, which leads to a higher concentration of COS in outlet. It shows that chemical conversion is the main partway in reaction system of COS. It indicates that hydrogenation conversion is the main reaction of COS removal from syngas. COS is preferentially catalyzed with active components in desulfurization sorbents, and generates H2S which is absorbed whereafter.