TY - JOUR
T1 - Difference between the mechanisms of propylene production from methanol and ethanol over ZSM-5 catalysts
AU - Takahashi, Atsushi
AU - Xia, Wei
AU - Wu, Qiang
AU - Furukawa, Teruyuki
AU - Nakamura, Isao
AU - Shimada, Hiromichi
AU - Fujitani, Tadahiro
N1 - Funding Information:
This work was supported by a grant from the New Energy and Industrial Technology Development Organization (NEDO).
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Ethanol
KW - Mechanistic difference
KW - Methanol
KW - Propylene
KW - ZSM-5
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U2 - 10.1016/j.apcata.2013.07.064
DO - 10.1016/j.apcata.2013.07.064
M3 - Article
AN - SCOPUS:84883426522
SN - 0926-860X
VL - 467
SP - 380
EP - 385
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -