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

✍ Scribed by Chunguang LI; Changxi MIAO; Yingying NIE; Yinghong YUE; Songyuan GU; Weimin YANG; Weiming HUA; Zi GAO

• Publisher: Elsevier Science
• Year: 2010
• Weight: 310 KB
• Volume: 31
• Category: Article
• ISSN: 1872-2067
• DOI: 10.1016/s1872-2067(10)60099-x

✦ Synopsis

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 CO 2 . The structural and textural characterization of these catalysts was done using N 2 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 CO 2 than with N 2 . This is due to the oxidative dehydrogenation of EB with the help of oxygen that originates from CO 2 as well as the coupling of EB simple dehydrogenation with the reverse water-gas shift reaction.