Improving HSAPO-34 Methanol-to-Olefin Turnover Capacity by Seeding the Hydrocarbon Pool

Praveen Bollini, Aditya Bhan

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Seeding the hydrocarbon pool before exposure to methanol ensures the presence of active olefinic and aromatic chain carriers in the HSAPO-34 cavity before the first methanol-to-olefin turnover. The primordial hydrocarbon pool enables the introduction, at low turnover numbers, of chain propagation steps that compete with methanol transfer dehydrogenation-mediated chain termination steps, thereby increasing the fraction of converted methanol used for productive turnovers during methanol-to-olefin catalysis over HSAPO-34. Seeding the hydrocarbon pool results, concurrently, in higher light-olefin yields and lower rates of carbon loss. The increasing relative preponderance of methanol transfer dehydrogenation steps with increasing methanol pressure renders seeding more effective at higher methanol pressures. Under the conditions used in this study, seeding appears to accelerate the buildup of the hydrocarbon pool without significantly altering its composition. The results reported here outline a strategy for mitigating the deleterious effects of methanol transfer dehydrogenation reactions while reemphasizing their primacy in effecting catalyst deactivation during methanol-to-olefins conversion.

Original languageEnglish (US)
Pages (from-to)479-483
Number of pages5
JournalChemPhysChem
Volume19
Issue number4
DOIs
StatePublished - Feb 19 2018

Bibliographical note

Funding Information:
We gratefully acknowledge financial support from The Dow Chemical Company and the National Science Foundation (CBET 1701534). We thank Dr. Dean M. Millar from The Dow Chemical Company for synthesizing the HSAPO-34 sample. We acknowledge Mr. Andrew Hwang and Mr. Sukaran Arora for helpful technical discussions.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

  • catalysis
  • deactivation
  • methanol-to-hydrocarbons
  • seeding
  • zeolites

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