Difference between the mechanisms of propylene production from methanol and ethanol over ZSM-5 catalysts

Atsushi Takahashi, Wei Xia, Qiang Wu, Teruyuki Furukawa, Isao Nakamura, Hiromichi Shimada, Tadahiro Fujitani

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We investigated the difference between the mechanisms of methanol conversion and ethanol conversion to propylene over ZSM-5 catalysts. The mechanism of methanol conversion depended on the Si/Al2 ratio, whereas the mechanism of ethanol conversion did not. We believe that at a high Si/Al2 ratio, propylene was produced from methanol via dimethyl ether by means of the hydrocarbon pool mechanism. In contrast, at a low Si/Al 2 ratio, dimethyl ether was dehydrated to ethylene, which was then directly converted to propylene. In the case of ethanol conversion, propylene was produced from ethylene, which was formed by intramolecular dehydration. We propose that ethylene was transformed to a carbene species, which was a transient intermediate for direct production of propylene.

Original languageEnglish
Pages (from-to)380-385
Number of pages6
JournalApplied Catalysis A: General
Volume467
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Ethanol
  • Mechanistic difference
  • Methanol
  • Propylene
  • ZSM-5

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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