1. Activation of the methane C–H bond by Al- and Ga-doped graphenes: a DFT investigation.
- Author
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Mousavian, Parisasadat, Esrafili, Mehdi D., and Sardroodi, Jaber J.
- Subjects
METHANE ,DENSITY functional theory ,CATALYTIC activity ,OXIDATION ,PARTIAL oxidation - Abstract
The potential of Al- and Ga-doped graphene (Al–Gr/Ga–Gr) to activate the C–H bond of CH
4 by N2 O to generate methanol is explored using density functional theory calculations. Both surfaces have a higher affinity for capturing N2 O than CH4 . The oxidation of CH4 starts with the decomposition of N2 O into N2 and Oads species, followed by a hydrogen transfer from CH4 to Oads , resulting in CH3 and HOads species. Our results demonstrate that CH3 combining with HOads to yield CH3 OH needs only 0.18 eV on Al–Gr, which is 0.11 eV lower than on Ga–Gr. On the other hand, the competing CO oxidation reaction (CO + Oads → CO2 ) is inhibited over the Ga–Gr because of its greater activation barrier than the CH4 oxidation process. These findings may provide valuable information for fine-tuning the catalytic activity of graphene-based materials in low-temperature partial oxidation of CH4 . [ABSTRACT FROM AUTHOR]- Published
- 2021
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