The different impacts of SO2 and SO3 on Cu/zeolite SCR catalysts
The different impacts of SO2 and SO3 on Cu/zeolite SCR catalysts
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DOI：
10.1016/j.cattod.2010.01.013
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发表时间：
2010-06-19
期刊：
影响因子：
5.3
通讯作者：
Peden, Charles H. F.
中科院分区：
文献类型：
--
作者：
Cheng, Yisun;Lambert, Christine;Peden, Charles H. F.
采用程序升温脱附（TPD）、X射线光电子能谱（XPS）和X射线吸收精细结构（XAFS）等表征技术，研究了SO2和SO 3对Cu/沸石SCR催化剂的不同影响。结果表明，大量的高度分散的CuSO 4形成的沸石催化剂（Z-CuSO 4）后SO 3中毒，解释了更显着的失活的Cu/沸石催化剂暴露于SO 3相比，由SO2中毒。本文首次证明了Cu/沸石SCR催化剂的活性位点参与硫的储存和去除，可以以非常不同的方式与SO2和SO 3反应。特别地，硫吸收程度的显著差异说明了SO2和SO 3中毒对Cu/沸石SCR催化剂性能的显著不同的影响。(C)2010 Elsevier B. V.保留所有权利。
The different impacts of SO2 and SO3 on Cu/zeolite SCR catalysts were investigated by SCR performance tests and multiple characterization techniques including temperature programmed desorption (TPD), Xray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS). The results indicate that a larger amount of highly dispersed CuSO4 formed in the zeolite catalysts (Z-CuSO4) upon SO3 poisoning, explaining the much more significant deactivation of the Cu/zeolite catalysts that were exposed to SO3 compared to poisoning by SO2. This paper provides the first demonstration that active sites of Cu/zeolite SCR catalysts involved in the storage and removal of sulfur can react with SO2 and SO3 in very different ways. In particular, the significant differences in the extent of sulfur uptake account for the considerably different impacts of SO2 and SO3 poisoning on the performance of Cu/zeolite SCR catalysts. (C) 2010 Elsevier B.V. All rights reserved.