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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.51A [2012] >
IJC-A Vol.51A(09-10) [September-October 2012] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.51A(09-10) [September-October 2012]
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