Res. Chem. Intermed.
, Vol. 28, No. 5, pp. 461–469 (2002)
Also available online - www.vsppub.com
Oxidative dehydrogenation of ethylbenzene with carbon
dioxide over zeolite-supported iron oxide catalysts
MIN SEOK PARK, JONG-SAN CHANG, DAE SUNG KIM
and SANG-EON PARK
Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology
(KRICT), P. O. Box 107, Yusung, Taejon 305-600, Korea
Received 20 September 2001; accepted 30 November 2001
Abstract—Oxidative dehydrogenation of ethylbenzene with carbon dioxide was carried out over
ZSM-5 zeolite-supported iron oxide catalysts. In the presence of carbon dioxide, ethylbenzene
was predominantly converted into styrene by oxidation. It was found that carbon dioxide in this
reaction plays a role as a soft oxidant to greatly improve catalytic activity. An active phase for the
dehydrogenation with carbon dioxide was suggested as rather reduced and isolated magnetite-like
phase having oxygen de ciency in zeolite matrix.
For the mitigation of global warming due to carbon dioxide, catalytic conversion
has been extensively studied over the last decade . Most studies in this
research have been concentrated on the utilization of carbon dioxide as a carbon
source through catalytic reduction processes with various kinds of reductants .
Particularly, hydrogen has long been used to abstract the oxygen atom of CO
for catalytic conversion into useful chemicals , but commercialization of the
catalytic hydrogenation process is confronted with some limitations because, in
most cases, the cost of hydrogen from conventional sources such as steam reforming
of hydrocarbons is not cheaper than that of chemicals obtained from catalytic
hydrogenation . As an alternative, the utilization of CO
as a soft oxidant and an
oxygen transfer agent is attracting considerable attention . This approach may be
expected to open new technology for CO
utilization. Yoo et al. already showed that
Fe/Mo/borosilicate catalyst could activate CO
which could function as a promoter
To whom correspondence should be addressed.