A mechanistic basis for the effect of aluminum content on ethene selectivity in methanol-to-hydrocarbons conversion on HZSM-5
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Physical Sciences and Engineering (PSE) Division
KAUST Catalysis Center (KCC)
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AbstractIncreasing 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.
CitationKhare R, Liu Z, Han Y, Bhan A (2017) A mechanistic basis for the effect of aluminum content on ethene selectivity in methanol-to-hydrocarbons conversion on HZSM-5. Journal of Catalysis 348: 300–305. Available: http://dx.doi.org/10.1016/j.jcat.2017.02.022.
SponsorsThe authors acknowledge financial support from National Science Foundation (CBET 1055846) and King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors also acknowledge Mr. Brandon Foley, University of Minnesota, and Mr. Sukaran Arora, University of Minnesota, for help with catalyst preparation and the experimental setup.
JournalJournal of Catalysis