Ethylbenzene Dehydrogenation in the Presence of CO₂ over MCF-Supported Vanadium Oxide Catalysts

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• 作者：Chunguang LI ; Changxi MIAO ; Yingying NIE ; Yinghong YUE ; Songyuan GU ; Weimin YANG ; Weiming HUA ; Zi GAO
• 关键词：vanadia ; mesocellular silica foam ; supported catalyst ; ethylbenzene dehydrogenation ; styrene ; carbon dioxide
• 刊名：Chinese Journal of Catalysis
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：31
• 期：8
• 页码：993-998
• 全文大小：309 K

文摘

A series of vanadia catalysts supported on mesocellular silica foam (MCF) with a V content ranging from 2 % to 10 % were studied with respect to their performance in the dehydrogenation of ethylbenzene (EB) to styrene in the presence of CO₂. The structural and textural characterization of these catalysts was done using N₂ adsorption, X-ray diffraction, and temperature-programmed reduction. These catalysts were found to be effective for the dehydrogenation reaction and the 6 % V/MCF catalyst showed the highest activity. The MCF-supported vanadia catalysts exhibited far higher activity than their conventional V/MCM-41 counterparts, which can be attributed to the higher reducibility and better diffusion of reactants and products in the former catalysts. A higher conversion was obtained during EB dehydrogenation with CO₂ than with N₂. This is due to the oxidative dehydrogenation of EB with the help of oxygen that originates from CO₂ as well as the coupling of EB simple dehydrogenation with the reverse water-gas shift reaction.