Oxidative dehydrogenation of n-octane over a vanadium–magnesium oxide catalyst: Influence of the gas hourly space velocity

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Oxidative dehydrogenation (ODH) of n-octane was carried out over a vanadium–magnesium oxide catalyst in a continuous flow fixed bed reactor. The catalyst was characterized by ICP–OES, powder XRD and SEM. The catalytic tests were carried out at different gas hourly space velocities (GHSVs), viz. 4000, 6000, 8000, and 10,000h−1. The best selectivity for octenes was obtained at the GHSV of 8000h−1, while that for C8 aromatics was attained at the GHSV of 6000h−1 at high temperatures (500 and 550°C). The catalytic testing at the GHSV of 10,000h−1 showed the lowest activity, while that at the GHSV of 4000h−1 consistently showed the lowest ODH selectivity. Generally, the best ODH performance was obtained by the catalytic testing at the GHSVs of 6000 and 8000h−1. No phasic changes were observed after the catalytic testing.