Two different types of catalytic C-H bond activations in partial oxidations are discussed: (i) activation by transition metal oxides which exchange redox equivalents with the feed molecule (Mars-van Krevelen), and (ii) activation on metal oxides where redox equivalents are exchanged directly between a hydrocarbon molecule and a surface oxygen species. For the former, we are particularly interested in support effects for vanadium oxide catalysts, in particular in the difference between reducible (VOx/CeO2)1 and non-reducible (VOx/SiO2) supports.2,3
For the latter, we discuss oxidative coupling of CH4 on (Li-)doped and undoped MgO surfaces.4
1 T. Kropp, J. Paier and J. Sauer, J. Am. Chem. Soc., 2014, 136, 14616.
2 J. Döbler, M. Pritzsche and J. Sauer, J. Am. Chem. Soc., 2005, 127, 10861.
3 X. Rozanska, R. Fortrie and J. Sauer, J. Am. Chem. Soc., 2014, 136, 7751.
4 K. Kwapien, J. Paier, J. Sauer, M. Geske, U. Zavyalova, R. Horn, P. Schwach, A. Trunschke and R. Schlögl,
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