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On reaction pathways in the conversion of methanol to hydrocarbons on HZSM-5
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Sun, Xianyong, Mueller, Sebastian, Liu, Yue, Shi, Hui, Haller, Gary L., Sanchez-Sanchez, Maricruz, van Veen, André C. and Lercher, Johannes A. (2014) On reaction pathways in the conversion of methanol to hydrocarbons on HZSM-5. Journal of Catalysis, Volume 317 . pp. 185-197. doi:10.1016/j.jcat.2014.06.017 ISSN 0021-9517.
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Official URL: http://dx.doi.org/10.1016/j.jcat.2014.06.017
Abstract
The underlying mechanisms of the two distinct catalytic cycles operating during conversion of methanol to olefins (MTO) on HZSM-5 have been elucidated under industrially relevant conditions. The co-existence of olefins and aromatic molecules in the zeolite pores leads to competition between the two cycles. Therefore, their importance depends on the local chemical potential of specific carbon species and the methanol conversion. Due to a faster, “autocatalytic” reaction pathway in the olefin based cycle, olefin homologation/cracking is dominant under MTO conditions, irrespective of whether aromatic molecules or olefins are co-fed with methanol. Another hydrogen transfer pathway, faster than the usual route, has been identified, which is directly linked to methanol. In agreement with that, the co-feeding of olefins resulted in a remarkable longer lifetime of the catalyst under MTO conditions, because the high rate methylation competes with the formation of more deactivating coke – presumably oxygenates- through methanol derivatives.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Journal or Publication Title: | Journal of Catalysis | ||||||||||
Publisher: | Academic Press | ||||||||||
ISSN: | 0021-9517 | ||||||||||
Official Date: | August 2014 | ||||||||||
Dates: |
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Volume: | Volume 317 | ||||||||||
Page Range: | pp. 185-197 | ||||||||||
DOI: | 10.1016/j.jcat.2014.06.017 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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