Bifunctional Strategy Coupling Y2O3-Catalyzed Alkanal Decomposition with Methanol-to-Olefins Catalysis for Enhanced Lifetime

Andrew Hwang, Aditya Bhan

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Bifunctional strategies exploiting the selective and catalytic decomposition of formaldehyde by Y2O3 improve the lifetime of CHA zeotypes and zeolites for methanol-to-olefins catalysis 4-fold, as quantified by total turnovers, without disrupting the inherently high selectivity to light olefins. The improvement in catalyst lifetime increases with increasing proximity between H+ sites of the zeotype/zeolite and the surface of the rare earth metal oxide. This proximity effect demonstrates crucial transport of formaldehyde between and within zeotypic/zeolitic domains on catalyst lifetime. These results provide mechanistic insights revealing formaldehyde as an accelerant for the initiation and termination of chain carriers and exemplify a strategy for designing improved methanol-to-olefins catalysts by optimizing (bi)functionality and reaction-transport dynamical phenomena. (Chemical Equation Presented).

Original languageEnglish (US)
Pages (from-to)4417-4422
Number of pages6
JournalACS Catalysis
Volume7
Issue number7
DOIs
StatePublished - Jul 7 2017

Keywords

  • bifunctional catalysis
  • deactivation
  • formaldehyde
  • methanol-to-olefins
  • rare earth metal oxide
  • yttrium oxide

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