Multicomponent MoVSbNbGdOx/SiO2 catalyst in oxidative dehydrogenation of ethane: Effect of Gd on catalytic properties.

The results obtained in this study show that Sb-containing catalysts MoVSbNbGdO x /SiO 2 are highly active in ethane oxidative dehydrogenation to produce ethylene. The ethylene yield of 72% (79.3% ethylene selectivity and 91.1% ethane conversion) was obtained at 400 °C on one of the best catalyst. The effect of Gd additives on the catalytic properties of MoVSbNbGdO x /SiO 2 catalysts was investigated. The catalysts with Gd/Mo = 0.010 – 0.015 demonstrated relatively high catalytic activity coupled with high selectivity to ethylene and excellent stability in ODE reaction, but further growth of the gadolinium content (Gd/Mo = 0.02) was accompanied by the decrease in the activity and ethylene selectivity. XRD, HRTEM, SEM, XPS and adsorption methods were used to reveal the phase composition, morphology and the structure of the obtained catalysts. [Display omitted] • The catalysts MoVSbNbGdO x /SiO 2 with different gadolinium content were synthesized. • The effect of Gd on the catalytic and physicochemical properties were investigated. • The ethylene yield of 72% was obtained at 4000 C on one of the best catalyst. • The active mass of catalyst contains two main phases, M1 (80%) and M2 (20%). • Phase M1is stabilized as needle-like morphology particles inside the SiO 2 particles. [ABSTRACT FROM AUTHOR]