Abstract

ARMAS, Norka et al. Kinetics and mechanism of the oxidative dehydrogenation of n-butane over a SiO₂-supported VMgO catalyst. Rev. Téc. Ing. Univ. Zulia [online]. 2003, vol.26, n.2, pp.117-126. ISSN 0254-0770.

An experimental study, and the corrresponding simulation, for the oxidative dehydrogenation of n-butane over a SiO₂(30 wt%)-supported VMgO catalyst (with a Mg/V atomic ratio of 4 and a surface area, S_BET, of 73 m²/g) is presented. Experimental data were obtained using a packed bed quartz tubular reactor operating under steady-state conditions, isothermal, and uniform flow conditions, varying the temperature within the range of 475-550°C, the contact time from 10 to 60 g_cat/(mol_n-butane/h), the inlet molar fraction of n-butane from 2 to 8% and that of oxygen from 8 to 20%. The proposed model is based on a sound reaction scheme, with kinetics expression derived using the redox mechanism of Mars-Van Krevelen. The best fitting was obtained with a correlation coefficient of 0.8715 and a variance of 1.33 x10^-3.

Keywords : Dehydrogenation; catalytic; oxidative; n-butane; simulation; V-Mg-O/SiO₂ catalyst.