01995nas a2200193   4500008004100000022001400041245009800055210006900153260011000222300001400332490000600346520120600352100002201558700002101580700002001601700001901621700002901640856013201669       2011                        eng d  a2044-475300aOxidative dehydrogenation of ethylbenzene using nitrous oxide over vanadia-magnesia catalysts0 aOxidative dehydrogenation of ethylbenzene using nitrous oxide ov  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG  a1262-12700 v13 a<p>A series of V-Mg-O catalysts with different loadings of vanadia were prepared by the wet impregnation method and the effect of the local structure of these catalysts on the oxidative dehydrogenation of ethylbenzene with N(2)O was investigated. High styrene selectivity (similar to 97%) was obtained at 773 K. The characterization of catalysts with methods such as XRD, FTIR, UV-visible, TPR, NMR and Laser Raman spectroscopy suggested that magnesium orthovanadate is the predominant vanadium containing phase and the size of the orthovanadate domains increases with increasing vanadia loading. The rate of ODH of ethylbenzene per V atom increases with vanadia loading and reaches a maximum at 10 wt%. The specific activity, i.e. the conversion of ethylbenzene per unit surface area of the catalysts, also exhibited a maximum at a vanadia loading of 10 wt% leading to the conclusion that activity of these catalysts is due to the presence of very small domains of Mg(3)(VO(4))(2) on the surface of MgO rather than crystallites of bulk Mg(3)(VO(4))(2). The higher styrene yield in the presence of N(2)O can be ascribed to the ability of N(2)O to keep vanadium species at a higher oxidation state.</p>1 aShiju, Raveendran1 aAnilkumar, Mettu1 aGokhale, S., P.1 aRao, Seshagiri1 aSatyanarayana, C., V. V.  uhttps://library.ncl.res.in/content/oxidative-dehydrogenation-ethylbenzene-using-nitrous-oxide-over-vanadia-magnesia-catalysts-0