The Role of Methoxy Groups in Methanol to Olefin Conversion

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• 作者：Zhi-Min Cui ; Qiang Liu ; Shao-Wei Bain ; Zhuo Ma ; Wei-Guo Song
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 21, 2008
• 年：2008
• 卷：112
• 期：7
• 页码：2685 - 2688
• 全文大小：119K
• 年卷期：v.112,no.7(February 21, 2008)
• ISSN：1932-7455

文摘

In a methanol-to-olefin conversion mechanism (MTO) study, by using zeolite ZSM-22's one-dimensionalchannels to exclude the hydrocarbon pool mechanism as well as secondary reactions, we found very lowolefin yield during an extended reaction time under normal MTO conditions. More significantly, no H/Dexchange between the acidic proton and the hydrogen atoms on methoxy groups was observed, even at elevatedtemperatures as high as 500 C, suggesting no C-H activation for methoxy groups under normal MTO reactionconditions. In comparison, substantial H/D exchange was found on ethoxy groups. These results confirmedthat methoxy groups are energetically not favored to form C-C bonds directly.