Catalysis and kinetics of the oxidative methane coupling

Reduction of N2O on MgO/Ag(100) via UV-Photoinduced Trapped Electrons

“…MgO as an ionic oxide of high stability with a simple rock salt structure serves as a prototype oxide resulting in numerous publications on the surface chemistry of MgO in its various modifications. − Furthermore, the interest in MgO arises from its broad relevance and its applications in surface science, electronics, and catalysis. − In particular, Li-doped MgO acts as a catalyst in the oxidative coupling of methane (OCM) where the activation of the carbon–hydrogen bond is of crucial importance. , The reactive site responsible for hydrogen abstraction is supposed to be a localized hole (i.e., an O – site on the MgO surface). − Such a localized hole can also be generated by the reduction of N 2 O at anion vacancies (F + centers, which are singly charged color centers). Consequently, the reduction of N 2 O respresents a good model system for the generation of O – from F + centers because the dissociation energy of N 2 O is lower than that of molecular oxygen (167 vs 247 kJ/mol).…”

“…21À24 In particular, Li-doped MgO acts as a catalyst in the oxidative coupling of methane (OCM) where the activation of the carbonÀhydrogen bond is of crucial importance. 21,25 The reactive site responsible for hydrogen abstraction is supposed to be a localized hole (i.e., an O À site on the MgO surface). 26À28 Such a localized hole can also be generated by the reduction of N 2 O at anion vacancies (F þ centers, which are singly charged color centers).…”