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Title: Utilization of carbon dioxide in oxidative dehydrogenation reactions
Authors: Raju, G
Reddy, Benjaram M
Park, Sang-Eon
Keywords: Ethylbenzene;n-Butane;Styrene;C4 olefins;Oxidative dehydrogenation;Carbon dioxide abatement;Dehydrogenation;Mixed oxide catalysts;Supported catalysts;Titania;Zirconia;Ceria;Vanadia
Issue Date: Sep-2012
Publisher: NISCAIR-CSIR, India
Abstract: Utilization of CO2 as a feedstock for synthesis of chemicals is an alternate and most promising option for CO2 abatement. In the present study, CO2 has been utilized as a soft oxidant for oxidative dehydrogenation of ethylbenzene and n-butane to the corresponding olefins. For this, TiO2−ZrO2 (TZ) mixed oxide-supported V2O5, CeO2 and V2O5–CeO2 catalysts has been synthesized, characterized and evaluated for the oxidative dehydrogenation reactions. The physicochemical characterization has been achieved by various techniques such as, powder X-ray diffraction, CO2 and NH3 temperature-preprogrammed desorption, temperature-preprogrammed reduction, X-ray photoelectron spectroscopy and BET surface area methods. XRD analysis of the samples calcined at 550 °C indicates that the impregnated active components are in a highly dispersed state on the support. XP spectra shows the existence of vanadium and cerium in V4+ and Ce4+/Ce3+ oxidation states, respectively. Among the various catalysts investigated, V2O5−CeO2/TiO2−ZrO2 exhibits a high conversion and product selectivity for the oxidative dehydrogenation of ethyl benzene. On the other hand, a high conversion and selectivity in the oxidative dehydrogenation of n-butane is noted over V2O5/SnO2−ZrO2 mixed oxide catalyst. The combined acid–base and redox properties of the catalysts play a major role in these reactions. In particular, the characterization studies reveal that mixed oxides show a high specific surface area, superior acid-base properties and better redox characteristics. All these properties enhance the catalytic performance of mixed oxide catalysts.
Page(s): 1315-1324
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(09-10) [September-October 2012]

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