Pt/V2O5-TiO2 catalysts for VOCs abatement: V2O5 loading effects on the deep oxidation of benzene

APESTEGUÍA, CARLOS R.; GARETTO, TERESITA; AVILA, MARÍA SOL; V. VENKAT RAO; KOMANDUR CHARY

San Francisco, California; EEUU

Congreso; XXI Congreso de la Sociedad Norteamericana de Catálisis; 2009

Introduction Platinum and palladium-based catalysts have been efficiently employed in the abatement of hydrocarbons from gaseous streams. Recently, it has been reported [1] that Pd supported on vanadia-promoted carriers efficiently catalyzes the deep oxidation of benzene. In particular, it was observed that when vanadium is added to Pd/Al2O3 or Pd/TiO2 catalysts the activity for benzene combustion increases. The high activity of Pd/V2O3-TiO2 catalysts was related to the simultaneous presence of two active sites: reducible vanadium sites and oxidized palladium species. In contrast, the oxidation of benzene has not been studied on Pt supported on vanadia-promoted carriers in spite that Pt is more active than Pd for oxidizing aromatic hydrocarbons and C2-C4 alkanes [2]. In this work, we study the combustion of benzene over Pt/V2O5-TiO2 catalysts containing different vanadium loadings. The catalysts were thoroughly characterized by several spectroscopic techniques. The aim was to establish the effect of V2O5 loading on Pt dispersion and catalyst activity.