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Please use this identifier to cite or link to this item: http://purl.org/purl/2262

Title: Structural and catalytic investigation of vanadia supported on ceria promoted with high surface area rice husk silica
Authors: Radhika, T
Sugunan, S
Keywords: Supported vanadia
Rice husk silica
Benzene oxidation
Issue Date: May-2006
Publisher: Elsevier
Abstract: Rice husk silica was utilized as the promoter of ceria for preparing supported vanadia catalysts. Effect of vanadium content was investigated with 2–10 wt.% V2O5 loading over the support. Structural characterization of the catalysts was done by various techniques like energy dispersive X-ray (EDX), X-ray diffraction (XRD), BET surface area, thermal analysis (TGA/DTA), FT-infrared spectroscopy (FT-IR), UV–vis diffused reflectance spectroscopy (DR UV–vis), electron paramagnetic spectroscopy (EPR) and solid state magnetic resonance spectroscopies (29Si and 51V MASNMR). Catalytic activity was studied towards liquid-phase oxidation of benzene. Surface area of ceria enhanced upon rice husk silica promotion, thus makes dispersion of the active sites of vanadia easier. Highly dispersed vanadia was found for low V2O5 loading and formation of cerium orthovanadate (CeVO4) occurs as the loading increases. Spectroscopic investigation clearly confirms the formation of CeVO4 phase at higher loadings of V2O5. The oxidation activity increases with vanadia loading up to 8 wt.% V2O5, and further increase reduces the conversion rate. Selective formation of phenol can be attributed to the presence of highly dispersed active sites of vanadia over the support.
URI: http://dyuthi.cusat.ac.in/purl/2262
ISSN: 1381-1169
Appears in Collections:Dr. Sugunan S

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