کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
58792 | 47173 | 2006 | 5 صفحه PDF | دانلود رایگان |
Catalytic behaviour in the selective oxidation of toluene of a series of vanadium systems supported on TiOx-coated sepiolite (6, 12 and 25 wt.% TiO2) with a vanadia loading around the theoretical monolayer (10 wt.%) has been investigated. The surface acid–base/redox properties of the solids were also evaluated by using 2-propanol conversion and pyridine chemisorption. The reducibility of surface vanadia species was studied by H2-TPR. Surface properties of vanadia species and, consequently, their catalytic behaviour were influenced by titania loading on sepiolite. Thus, the vanadium systems with the highest titania loading were the most active and selective in toluene oxidation. Furthermore, this behaviour seems to be mainly related to the density of the active sites capable of being reduced and producing propanone in the vanadium systems.
Journal: Catalysis Today - Volume 112, Issues 1–4, 15 March 2006, Pages 28–32