The effects of carbonaceous species in HZSM-5 on methanol-to-olefin process

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• 作者：Hong Liu ; Luming Peng ; Nianhua Xue ; Xuefeng Guo ; Weiping Ding ; ^{dingwp@nju.edu.cn} ; Weimin Yang¹ ; Zaiku Xie¹
• 关键词：Carbonaceous species ; Acid density ; HZSM-5 ; MTO ; P/E ratio
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：16 April, 2012
• 年：2012
• 卷：421-422
• 期：Complete
• 页码：108-113
• 全文大小：645 K

文摘

An improved transient ¹²CH₃OH/¹³CH₃OH switching method is used at steady-state conditions with a computer-controlled multi-position valve to distinguish the formation paths of propene and ethene over HZSM-5 zeolites in the methanol-to-olefin process for understanding the effects of Si/Al ratios and the carbonaceous deposited in the zeolites. By carefully analyzing the isotope distribution in products in short time intervals at transient state, it is demonstrated that a fraction of the carbonaceous species is active and participates in the methanol reactions. On high silica zeolite, the active carbonaceous species are responsible for the production of ethene, while propene is formed mainly through rapid alkene methylation in zeolite channels. High Si/Al ratio of zeolite leads to high ratio of propene to ethene in products of methanol-to-olefin process.