Production of olefins via oxidative de-hydrogenation of C3-C4 fraction by O2 over (Cr-Mo)SiO2

Research Paper (postgraduate) from the year 2015 in the subject Chemistry - Organic Chemistry, , language: English, abstract: The present study investigates the oxidative dehydrogenation of propane-butane (C3-C4) fraction over mono (Cr or Mo) and bi-metal (Cr-Mo) loaded SiO2 catalysts. The catalysts were prepared by sequential impregnation method at 500oC calcination temperature. Experiments were performed by feeding C3-C4 fraction, oxygen, nitrogen, and steam into a continuous flow quartz reactor at an atmospheric pressure (P = 1 atm.), reaction temperatures between 500 - 650oC, gas hourly space velocity (GHSV) within 100 - 400 h-1, and at reaction time (tr) = 2h. Appropriate water vapor addition to the feed sinificantly minimizes oxidation into coke deposits on the catalyst surface, and also prevents further olefin conversion into undesirable product. The physicochemical properties were evaluated by BET, XRD, IR, and EPR characterization techniques. The major oxidation products are ethylene, propylene, isobutylene, butylene. This paper reports that the total yield of olefins (? C2-C4) = 66.0 % was achieved at 83.5 % conversion level of C3-C4 at 630oC. The results indicate that the addition of Mo to catalysts of Cr/SiO2 modifies its catalytic activity for the ODH reaction. Mono-metallic catalysts (Cr/SiO2 and Mo/SiO2) were prepared for comparison purposes.

Ayodeji A. Ijagbuji was born on the 1st of September, 1984 in Ondo State, Nigeria. He attended the Staff Secondary School, Federal University of Technology, Akure, between 1994 to 2000. In 2006, he received the B.Sc. degree in Industrial Chemistry with a 2nd Class (Hons.) Upper (C.G.P.A = 4.3/5), and as the best graduating student from the Adekunle Ajasin University. Between 2007 to 2008, he rendered the voluntary National service at the Elf Petroleum Nigeria Limited, River State. In 2008, he became recognized as a Database 10g Administrator by Oracle, California, USA. He received a Russian language Diploma in 2010, the M.Sc. (with Distinction) in 2011, and Ph.D. degrees in 2015 in Chemical Technology of Inorganic Materials from the East Ukrainian National University, Luhansk, Ukraine. Between 2011 to 2015, he worked as a Research Assistant under the supervisions of Prof. Dr. Ivan I. Zakharov and Prof. Alexandre D. Tyulpinov. He is currently a lecturer in the Department of Chemistry and Industrial Chemistry, Adekunle Ajasin University. His research interests include Advanced oxidation process, Industrial-inorganic chemistry, and Quantum chemistry. He is a member of the American Chemical Society. He is the author of 3 thesis/dissertation, 1 book, and has co-authored in 1 book chapter, 2 patents, 5 journal articles, and 5 conference papers.