文献类型：期刊文献

英文题名：Behaviors of coke deposition on SAPO-34 catalyst during methanol conversion to light olefins

作者：Qi, Guozhen[1]; Xie, Zaiku[2]; Yang, Weimin[2]; Zhong, Siqing[2]; Liu, Hongxing[2]; Zhang, Chengfang[1]; Chen, Qingling[2]

机构：[1]E China Univ Sci & Technol, Inst Chem Technol, Shanghai 200237, Peoples R China;[2]SINOPEC Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

年份：2007

卷号：88

期号：5

起止页码：437

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20071410524602);WOS:【SCI-EXPANDED(收录号:WOS:000246116300002)】；

语种：英文

外文关键词：MTO; SAPO-34; coke; FTIR; DTA

摘要：The deposition of coke on SAPO-34 during methanol conversion to olefins at temperatures of 623-823 K was observed to be fast initially but moderate in the later stage. Micropores are blocked badly at coke contents of above 4 wt.%. The coke deposition influences olefins selectivity significantly and selectivities of ethylene plus propylene reach maximum at a coke content of about 5.7 wt.%. The coke formation can be attenuated by the presence of water, but the effect of water weakens gradually with the progress of the reaction. A model relating the coke content over SAPO-34 to cumulative amount of methanol fed to the catalysts is proposed and proved the validity to estimate the coke content on SAPO-34 at different reaction conditions. The coke deposited at different reaction temperatures has different compositions. (c) 2006 Elsevier B.V. All rights reserved.