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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 1
BKCSDE 28(1)
January 20, 2007

Title	Dehydrogenation of Ethylbenzene to Styrene with CO₂ over TiO₂-ZrO₂ Bifunctional Catalyst
Author	David Raju Burri, Kwang-Min Choi, Sang-Cheol Han, Abhishek Burri, Sang-Eon Park*
Keywords	Dehydrogenation, Styrene, CO₂, TiO₂-ZrO₂, Catalysis
Abstract	In the dehydrogenation of ethylbenzene to styrene, CO₂ could play a role as an oxidant to increase conversion of ethylbenzene and stability as well over TiO₂-ZrO₂ mixed oxide catalysts. TiO₂-ZrO₂ catalysts were prepared by co-precipitation method and were characterized by BET surface area, bulk density, X-ray diffraction, temperature programmed desorption of NH₃ and CO₂. These catalysts were found to be X-ray amorphous with enhanced surface areas and acid-base properties both in number and strength when compared to the respective oxides (TiO₂ and CO₂). These catalysts were found to be highly active (> 50% conversion), selective (> 98%) and catalytically stable (10 h of time-on-stream) at 600 ^oC for the dehydrogenation of ethylbenzene to styrene. However, in the nitrogen stream, both activity and stability were rather lower than those in the stream with CO₂. The TiO₂-ZrO₂ catalysts were catalytically superior to the simple oxide catalysts such as TiO₂ and ZrO₂. The synergistic effect of CO₂ has clearly been observed in directing the product selectivity and prolonging catalytic activity.
Page	53 - 58
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