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VOx species supported on Al2O3-SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane
Authors: Vlčková Šárka | Čapek Libor | Setnička Michal | Bulánek Roman | Čičmanec Pavel | Kalužová Alena | Pastva J. | Zukal A.
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Reaction Kinetics Mechanisms and Catalysis
Publisher name: Springer
Place: Heidelberg
Page from-to: 319-333
Titles:
Language Name Abstract Keywords
cze VOx na Al2O3-SBA-15: struktura a aktivita v oxidativní dehydrogenaci etanu Práce se zabývá transplantací aluminy do SBA-15 materiálu a následnou impregnací VOx částic. Distribuce VOx částic a jejich aktivita a selektivita v oxidativní dehydrogenaci etanu byly studovány. ODH; etan; UV-VIS; H2-TPR; VOx; Al2O3-SBA-15
eng VOx species supported on Al2O3-SBA-15 prepared by the grafting of alumina onto SBA-15: structure and activity in the oxidative dehydrogenation of ethane This paper focuses attention on the grafting of alumina onto SBA-15 material and the subsequent impregnation of vanadium oxide species (VO (x) ). The role of alumina loading on the distribution of VOx species 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 (N-2-adsorption/desorption isotherms), the distribution of VO (x) species (H-2-TPR and DR UV-vis) and the acidic properties (NH3-TPD). While V-SBA-15 mainly contains monomeric tetrahedrally coordinated VOx species, grafting of alumina on SBA-15 catalysts result in decreasing population of isolated monomeric VOx units in V-Al2O3-SBA-15 catalysts, increasing population of T (d) oligomeric VOx species and the formation of a low amount of octahedrally coordinated VOx species. 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. ODH; Ethane; UV-Vis; H2-TPR; VOx; Al2O3-SBA-15

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