Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/41959
標題: Influence of secondary metal oxide additives on molecular structure and reactivity of V2O5/SnO2/SiO2 catalysts during methanol oxidation
作者: Jehng, J.M.
鄭紀民
Chen, S.C.
Liu, Y.C.
關鍵字: supported vanadium oxide
mixed oxide support
in situ Raman
reducibility
surface acidity
methanol oxidation
vanadia-titania catalysts
v2o5/tio2/sio2 catalysts
raman-spectroscopy
nitric-oxide
reduction
tio2
nh3
no
performance
ammonia
期刊/報告no:: Journal of the Chinese Institute of Chemical Engineers, Volume 30, Issue 4, Page(s) 319-327.
摘要: In situ Raman studies of the CrO3, Nb2O5, and WO3-V2O5/SnO2/SiO2 catalysts have revealed that chromium oxide forms a surface CrO3 overlayer and niobium oxide and tungsten oxide form bulk Nb2O5 and WO3 particles, respectively, on the surface. The interaction of the surface CrO3 species with the V-O-Sn bridging bond in the V2O5/SnO2/SiO2 catalyst induces the total reduction of the surface vanadium oxide species during methanol oxidation. The absence of V+5 atom in the catalyst during reaction conditions results in a lower reactivity of the methanol oxidation reaction. The formation of bulk Nb2O5 and WO3 particles on the V2O5/SnO2/SiO2 surface also decrease methanol oxidation reactivity. The formation of new surface acid sites on the promoted-V2O5/SnO2/SiO2 catalysts does not alter the reaction mechanisms toward the acid site's product (CH3OCH3), and only one site (redox) is needed to perform the methanol oxidation reaction. TPR studies indicate that the reducibility of the surface vanadium oxide species is affected by the reducibility of the secondary metal oxide.
URI: http://hdl.handle.net/11455/41959
ISSN: 0368-1653
Appears in Collections:化學工程學系所

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