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Oxidative coupling of methane to C2 hydrocarbons over doped titania catalysts

Papageorgiou, Demetris, Vamvouka Despoina, Verykios, Xenophon E

Πλήρης Εγγραφή


URI: http://purl.tuc.gr/dl/dias/F28A244A-BEE7-476D-8536-455470094415
Έτος 1993
Τύπος Δημοσίευση σε Περιοδικό με Κριτές
Άδεια Χρήσης
Λεπτομέρειες
Βιβλιογραφική Αναφορά D. Papageorgiou, D. Vamvouka and X. E. Verykios, "Oxidative coupling of methane to C2 hydrocarbons over doped titania catalysts", Stud. Surf. Sci. Catal., vol. 75, pp. 2269-2272, 1993. doi:10.1016/S0167-2991(08)64277-9 https://doi.org/10.1016/S0167-2991(08)64277-9
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Περίληψη

The performance of altervalent doped TiO2 catalysts under oxidative coupling of methane conditions is investigated. It is shown that higher-valence doping (W6+, Nb5+, Ta5+) of TiO2 enhances significantly methane conversion activity and reduces selectivity to nearly zero levels. On the other hand, doping TiO2 with lower valence cations (Li+, Zn+2) has a small influence on activity but results in a significant enhancement of selectivity. These results are attributed to alterations of the bulk electronic structure of the semiconductivity catalysts as well as to alterations of surface parameters such as acidity/basicity characteristics, oxygen ion mobility and lattice oxygen reactivity.

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