Oxidative dehydrogenation of 4-vinylcyclohexene into styrene over ZrO2 catalyst promoted with Fe2O3 and CaO |
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Authors: | Yong-Suk Choi Yong-Ki Park Jong-San Chang Sang-Eon Park Anthony K. Cheetham |
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Affiliation: | (1) Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology, PO Box 107, Taejon, 305-606, Korea;(2) Material Research Laboratory, University of California, Santa Barbara, CA 93106, USA |
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Abstract: | The oxidative dehydrogenation of 4-vinylcyclohexene (VCH) into styrene was carried out in the presence of oxygen over a ZrO2 catalyst promoted with Fe2O3 and CaO. Intrinsically, ZrO2 showed high dehydrogenation activity, which resulted in 80% styrene selectivity with 45% conversion at 425 °C and LHSV 3 h−1. When the ZrO2 was further promoted with calcium and iron, CaO/Fe2O3/ZrO2, the highest styrene selectivity of 88.9% was obtained as well as the lowest deactivation. The deactivation of catalyst was prohibited properly through the introduction of oxygen in the reactant together with the modification of Fe2O3/ZrO2 with CaO. The CaO/Fe2O3/ZrO2 showed constant catalytic activity and selectivity for more than 50 h without deactivation. The selectivity of styrene was strongly influenced by the mole ratio of O2/VCH and 95% selectivity with 80% conversion was obtained at O2/VCH mole ratio of 6 over Fe2O3/ZrO2. It is thought that the oxidative dehydrogenation proceeds through the dehydrogenation (DH) of ring-hydrocarbon of VCH followed by selective combustion of hydrogen (SHC) and the high selectivity of styrene was achieved by the bi-functional role of ZrO2 for DH and SHC reactions. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | oxidative dehydrogenation deactivation VCH styrene ZrO2 Fe2O3 CaO |
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