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 language | English (US) |
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Pages (from-to) | 1812-1821 |
Number of pages | 10 |
Journal | ACS Catalysis |
Volume | 6 |
Issue number | 3 |
DOIs | |
State | Published - Mar 4 2016 |
All Science Journal Classification (ASJC) codes
- Catalysis
- General Chemistry