A systematic study on Pt based, subnanometer-sized alloy cluster catalysts for alkane dehydrogenation: Effects of intermetallic interaction

Andreas Hauser, Paul R. Horn, Martin Head-Gordon, Alexis T. Bell

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Platinum-based bimetallic nanoparticles are analyzed by the application of density functional theory to a series of tetrahedral Pt3X cluster models, with element X taken from the P-block, preferably group 14, or from the D-block around group 10. Almost identical cluster geometries allow a systematic investigation of electronic effects induced by different elements X. Choosing the propane-to-propene conversion as the desired dehydrogenation reaction, we provide estimates for the activity and selectivity of the various catalysts based on transition state theory. No significant Brønsted-Evans-Polanyi-relation could be found for the given reaction. A new descriptor, derived from an energy decomposition analysis, captures the effect of element X on the rate-determining step of the first hydrogen abstraction. Higher activities than obtained for pure Pt4 clusters are predicted for Pt alloys containing Ir, Sn, Ge and Si, with Pt3Ir showing particularly high selectivity.

Original languageEnglish
Pages (from-to)10906-10917
Number of pages12
JournalPhysical chemistry, chemical physics
Volume18
Issue number16
DOIs
Publication statusPublished - 28 Apr 2016

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Fields of Expertise

  • Advanced Materials Science

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