VOxspecies supported on Al2O3–SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane

Autor: Botková, Š., Čapek, L., Setnička, M., Bulánek, R., Čičmanec, P., Kalužová, A., Pastva, J., Zukal, A.
Zdroj: Reaction Kinetics, Mechanisms and Catalysis; October 2016, Vol. 119 Issue: 1 p319-333, 15p
Abstrakt: This paper focuses attention on the grafting of alumina onto SBA-15 material and the subsequent impregnation of vanadium oxide species (VOx). The role of alumina loading on the distribution of VOxspecies was studied in V–Al2O3–SBA-15 catalysts and its activity/selectivity in oxidative dehydrogenation of ethane. The activity of V–Al2O3–SBA-15 materials are correlated with the textural properties (N2-adsorption/desorption isotherms), the distribution of VOxspecies (H2-TPR and DR UV–vis) and the acidic properties (NH3-TPD). While V–SBA-15 mainly contains monomeric tetrahedrally coordinated VOxspecies, grafting of alumina on SBA-15 catalysts result in decreasing population of isolated monomeric VOxunits in V–Al2O3–SBA-15 catalysts, increasing population of Tdoligomeric VOxspecies and the formation of a low amount of octahedrally coordinated VOxspecies. V–Al2O3–SBA-15 catalysts are more selective to ethane (at the same conversion of ethane) compared to V–SBA-15 and V-alumina catalysts.
Databáze: Supplemental Index
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