Correlation of Methane Activation and Oxide Catalyst Reducibility and Its Implications for Oxidative Coupling

Gaurav Kumar, Sai Lap Jacky Lau, Matthew D. Krcha, Michael J. Janik

Research output: Contribution to journalArticle

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Abstract

We investigate methane activation over a range of metal-oxide surfaces. Density functional theory calculations are used to correlate the C-H bond activation energy to the surface reducibility (oxygen vacancy formation energy, work function). The correlation includes several reducible and nonreducible metal-oxides, doped CeO2, doped TiO2, ZnO, and doped MgO, and also holds for various oxidation states of TbOx, different surface facets of TiO2, and variation of Hubbard U parameter for CeO2. We find a linear correlation between the C-H activation reaction energy,·CH3 adsorption energy, and the oxygen vacancy formation energy of pure/doped metal-oxides, making surface reducibility a descriptor for predicting catalyst activity and selectivity against further oxidation of the·CH3 radical.

Original languageEnglish (US)
Pages (from-to)1812-1821
Number of pages10
JournalACS Catalysis
Volume6
Issue number3
DOIs
StatePublished - Mar 4 2016

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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