Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/14667
Title: Utilization of carbon dioxide in oxidative dehydrogenation reactions
Authors: Raju, G
Reddy, Benjaram M
Park, Sang-Eon
Keywords: Ethylbenzene
<i style="mso-bidi-font-style:normal"><span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:"Times New Roman";mso-fareast-font-family: "Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:EN-US; mso-bidi-language:AR-SA" lang="EN-US">n</span></i><span style="font-size:11.0pt; mso-bidi-font-size:10.0pt;font-family:"Times New Roman";mso-fareast-font-family: "Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:EN-US; mso-bidi-language:AR-SA" lang="EN-US">-Butane</span>
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 CO<sub>2</sub> as a feedstock for synthesis of chemicals is an alternate and most promising option for CO<sub>2</sub> abatement. In the present study, CO<sub>2</sub> has been utilized as a soft oxidant for oxidative dehydrogenation of ethylbenzene and <i style="mso-bidi-font-style: normal">n</i>-butane to the corresponding olefins. For this, TiO<sub>2</sub>−ZrO<sub>2</sub> (TZ) mixed oxide-supported V<sub>2</sub>O<sub>5</sub>, CeO<sub>2 </sub>and V<sub>2</sub>O<sub>5</sub>–CeO<sub>2 </sub>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, CO<sub>2</sub> and NH<sub>3</sub> 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 V<sup>4+</sup> and Ce<sup>4+</sup>/Ce<sup>3+</sup> oxidation states, respectively. Among the various catalysts investigated, V<sub>2</sub>O<sub>5</sub>−CeO<sub>2</sub>/TiO<sub>2</sub>−ZrO<sub>2</sub> 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 <i style="mso-bidi-font-style: normal">n</i>-butane is noted over V<sub>2</sub>O<sub>5</sub>/SnO<sub>2</sub>−ZrO<sub>2</sub> 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.
Description: 1315-1324
URI: http://hdl.handle.net/123456789/14667
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(09-10) [September-October 2012]

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