Abstract
Titanium oxide was grafted on the surface of MCM-41 to produce a mesoporous TiO 2/MCM-41 composite to serve as a catalyst support. Vanadia was grafted on this titania support to produce V 2O 5/TiO 2/MCM-41 and catalytic oxidation of ethanol by air was used as a probe reaction to study the influence of the support on the catalytic behavior of this catalyst. Catalyst V 2O 5/TiO 2/MCM-41 has reactivity five times higher than the reactivity of vanadia on MCM-41. EXAFS analysis of vanadium indicates that vanadia on both supports have similar structures and polymeric morphologies. The enhancement of reactivity was due to the direct dispersion of vanadia on TiO 2 in V 2O 5/TiO 2/MCM-41 as indicated by the EXAFS and XANES studies. This TiO 2-grafted MCM-41 mesoporous framework thus has high potential for use as a mesoporous TiO 2 support. Such support is superior to traditional anatase TiO 2, pure mesoporous TiO 2, or TiO 2/SiO 2 supports owing to its much larger surface area and better thermal stability at elevated temperatures.
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