III International Conference

PP-II-113SELECTIVE OXIDATION OF FORMALDEHYDE OVER SUPPOTED VANADIACATALYSTSSemionova Ye.V., Popova G.Ya., Andrushkevich T.V., Chesalov Yu.A., Dovlitova L.S.,Malakhov V.V., Plyasova L.M., Rogov V.A., Parmon V.N.Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russiagyap@catalysis.nsk.suThe effect of nature of the oxide support on catalytic properties of 20%V 2 O 5 /TiO 2 (VTi),30%V 2 O 5 /Al 2 O 3 (VAl), 20%V 2 O 5 /SiO 2 (VSi) was studied for formaldehyde selectiveoxidation. Formic acid is the main product of formaldehyde oxidation over bulk V 2 O 5 andsupported vanadia catalysts. The following row of catalytic activity was determined: VTi >>VAl > VSi > V 2 O 5 . The highest activity of the VTi catalysts was obtained due to chemicalinteraction of vanadium with TiO 2 contrary to SiO 2 and γ-Al 2 O 3 . The effect of the support onthe structure and bond strength of formaldehyde surface species was investigated.1. IntroductionSupported vanadium oxide catalysts represent an important class of heterogeneouscatalysts that are widely used in the chemical industry in various selective oxidation reaction.Catalytic properties of these catalysts are essentially depend on the nature of support.In the present work we investigated the influence of the support nature on the selectivity /activity of the supported vanadia catalysts in the reaction of formaldehyde oxidation. Theeffect of the support on the structure and bond strength of formaldehyde surface species withvanadium sites was investigated.2. ExperimentalThe catalysts 20% V 2 O 5 /TiO 2 (VTi), 30% V 2 O 5 /Al 2 O 3 (VAl), 20% V 2 O 5 /SiO 2 (VSi) wereprepared by the incipient wetness impregnation. The samples were dried at 110 o C andcalcined at 400 o C for 4 h in a stream of air.A Siemens D-500 diffractometer (Germany) with K α radiation was used for in situ X-raydiffraction (XRD) studies.IR spectra were recorded with a Fourier spectrometer BOMEM МВ-102 at roomtemperature. The sample (2 mg) was mixed with KBr (500 mg) and extruded to form a disk.A flow-through quartz high-temperature IR cell-reactor with the CaF 2 windows wasemployed for the in situ IR experiments.Catalyst performance was studied in a flow circuit setup with differential reactor underatmospheric pressure at 120 o C and with constant composition of the reaction mixture(% vol): 5% СН 2 О, 10 % Н 2 О, and 85 % air.371