A mechanistic basis for the effect of aluminum content on ethene selectivity in methanol-to-hydrocarbons conversion on HZSM-5

Rachit Khare, Zhaohui Liu, Yu Han, Aditya Bhan

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Increasing crystallize size or aluminum content in MFI-type zeolites independently enhances the propagation of the aromatics-based methylation/dealkylation cycle relative to that of the olefins-based methylation/cracking cycle in methanol-to-hydrocarbons (MTH) conversion and consequentially results in higher ethene selectivity. Ethene selectivity increases monotonically with increasing aluminum content for HZSM-5 samples with nearly identical crystallite size consequent to an increase in the intracrystalline contact time analogous to our recent report detailing the effects of crystallite size (Khare et al., 2015) on MTH selectivity. The confected effects of crystallite size and site density on MTH selectivity can therefore, be correlated using a descriptor that represents the average number of acid sites that an olefin-precursor will interact with before elution.

Original languageEnglish (US)
Pages (from-to)300-305
Number of pages6
JournalJournal of Catalysis
Volume348
DOIs
StatePublished - Jan 1 2017

Keywords

  • Ethene selectivity
  • MFI
  • Methanol-to-hydrocarbons
  • Methanol-to-olefins
  • Silicon to aluminum ratio
  • ZSM-5
  • Zeolites

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