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• W1520323193 abstract "Highly dispersed Al 2 O 3 /SiO 2 and V 2 O 5 /Al 2 O 3 /SiO 2 catalysts under various conditions (e.g., hydration, dehydration, and methanol chemisorption) were investigated by in situ Raman and UV–vis-NIR diffuse reflectance spectroscopies. Temperature-programmed reduction and methanol oxidation were employed as chemical probe reactions to examine the reducibility and reactivity properties of these catalysts. The spectroscopic results revealed that the surface vanadium oxide species on the Al 2 O 3 /SiO 2 supports are predominantly isolated VO 4 units [O=V(O–Support) 3 ] in the dehydrated state. The surface vanadium oxide species preferentially interact with the aluminum oxide species on the silica surface. Consequently, the reduction behavior of the surface vanadium oxide species is closer to that of V 2 O 5 /Al 2 O 3 at higher alumina loading. Furthermore, the turnover frequency of the surface VO 4 species on Al 2 O 3 /SiO 2 for methanol oxidation to redox products (formaldehyde, methyl formate, and dimethoxy methane) increases by an order of magnitude relative to the V 2 O 5 /SiO 2 catalysts and is comparable to that of the V 2 O 5 /Al 2 O 3 catalysts. It is concluded that the substitution of the Si(IV)–O − by the less electronegative Al(III)–O − ligands for the isolated VO 4 units is responsible for the enhanced reactivity of the surface V cations." @default.
• W1520323193 created "2016-06-24" @default.
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• W1520323193 date "2000-05-01" @default.
• W1520323193 modified "2023-10-01" @default.
• W1520323193 title "Structural Characteristics and Reactivity Properties of Highly Dispersed Al2O3/SiO2 and V2O5/Al2O3/SiO2 Catalysts" @default.
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• W1520323193 doi "https://doi.org/10.1006/jcat.2000.2822" @default.
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