Effect of carbon dioxide in dehydrogenation of ethylbenzene to styrene over zeolite-supported iron oxide catalyst

Citation
Js. Chang et al., Effect of carbon dioxide in dehydrogenation of ethylbenzene to styrene over zeolite-supported iron oxide catalyst, B KOR CHEM, 19(12), 1998, pp. 1342-1346
Citations number
25
Categorie Soggetti
Chemistry
Journal title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
ISSN journal
02532964 → ACNP
Volume
19
Issue
12
Year of publication
1998
Pages
1342 - 1346
Database
ISI
SICI code
0253-2964(199812)19:12<1342:EOCDID>2.0.ZU;2-1
Abstract
The dehydrogenation of ethylbenzene with carbon dioxide has been carried ou t over ZSM-5 zeolite-supported iron oxide catalyst as well as commercial ca talyst (K-Fe2O3) and unsupported iron oxide (Fe3O4) for comparison. In the dehydrogenation over the ZSM-5 zeolite-supported iron oxide catalyst, ethyl benzene is predominantly converted to styrene by an oxidative pathway in th e presence of excess carbon dioxide. Carbon dioxide in this reaction is fou nd to play a role as an oxidant for promoting catalytic activity as well as coke resistance of catalyst. On the other hand, both of commercial catalys t and unsupported Fe3O4 exhibit considerable decrease in catalytic activity under the same condition. It is suggested that an active phase for the deh ydrogenation with carbon dioxide over ZSM-5 zeolite-supported iron oxide ca talyst would be rather a reduced and isolated magnetite (Fe3O4)-like phase having oxygen deficiency in the zeolite matrix.