Promotional role of Ceria in CeO2/MgAl2O4 spinel catalysts in CO2 assisted selective oxidative dehydrogenation of ethylbenzene to styrene

With the aim of understanding the influence of CeO2 on MgO, Al2O3 and MgAl2O4 in CO2 assisted oxidative dehydrogenation of ethylbenzene to styrene was attempted and the results conveyed that the MgAl2O4 spinel supported CeO2 (CeO2/MgAl2O4) catalyst exhibited superior activity with 80% yield of styrene and in apart activity consistency up to 50 h of time-on-stream, revealing the establishment of synergism in CeO2/MgAl2O4, ascertained from XRD, BET Surface area, FT-IR, H-2-TPR, UV-vis DRS, XPS, TPD and HRTEM techniques, acid-base characteristics of MgAl2O4, smaller particle size of CeO2 and its high dispersion are responsible for elevated activity, stability and regenarable capability. (C) 2019 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.