文献类型：期刊文献

英文题名：Study of coke behaviour of catalyst during methanol-to-olefins process based on a special TGA reactor

作者：Hu, Hao[1];Cao, Fahai[1];Ying, Weiyong[1];Sun, Qiwen[2];Fang, Dingye[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2010

卷号：160

期号：2

起止页码：770

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20103013094303);WOS:【SCI-EXPANDED(收录号:WOS:000279137900047)】；

基金：The authors are grateful to the financial support of the National Key Technology Program of China (No. 2006BAE02 B02) and Yankuang Energy R&D Co., Ltd., Shanghai.

语种：英文

外文关键词：TGA reactor; Coke deposition; Methanol-to-olefins; SAPO-34; Coking model

摘要：Thermax 700 thermo-gravimetric analysis (TGA) instrument with large weight capacity is introduced for the investigation of the coke formation of SAPO-34 catalyst during methanol-to-olefin (MTO) process in this study. By the use of a special sample basket and relatively higher methanol concentration, the TGA instrument can be viewed as fixed-bed reactor, while both coking rate and reaction results for MTO reaction can be recorded in situ. The influences of reaction conditions over coking rate are discussed, while the effect of temperature is emphasized. Both weight change and color interchanging phenomenon at different reaction temperatures indicate that the severity of hydrothermal atmosphere is partly responsible for the different species of coke formation as temperature varies. A simplified coking model with exponential mathematical expression is established and verified. Coking has a very close relationship with MTO results. The different trend of product distribution as coking occurs proves the selective deactivation phenomenon. DME can be viewed as an indicator of the deactivation level in this process. The coking model is valuable to express the catalyst activity change during reaction as well as kinetic modeling for further investigations, while the catalyst coke content during MTO process can be predicted simultaneously. (c) 2010 Elsevier B.V. All rights reserved.