Oxidative Dehydrogenation of The C4-C5 Paraffins Over Vanadium-Containing Oxide Catalysts

Catalytic oxidative dehydrogenation ofn-butane

“…Another patented catalytic system was Ni}P}O, where C 4 selectivity reached 63.9% for x ¼ 48:5% (50). Promising values were also obtained with the Ni}V}Sb}O/ Al 2 O 3 system (56), with x close to 40% and with a product distribution where selectivities to butadiene and butenes were 42.0 and 30.5%, respectively. In the US patent no.…”

“…for total oxidation to carbon oxides (56). Thus, oxygen concentration in the gas phase is a parameter affecting selectivity because intrinsic reaction rates present different dependencies on this factor.…”

Recent Advances in Transition Metal Catalyzed Oxidation of Organic Substrates with Molecular Oxygen

“…The large majority of the catalysts studied for the ODH of lighter alkanes are based on the chemistry of vanadium oxides. − Their catalytic behavior is usually modified when deposited on SiO 2 , Al 2 O 3 , TiO 2 , and MgO with new surface structure. − The most profound changes are frequently observed at low vanadium loading, not exceeding a monolayer, and species in the monolayer display higher catalytic activity and/or selectivity than the bulk V 2 O 5 . The ODH of C 2 −C 5 alkanes and vinylcyclohexene are reported with 10−60% conversion and 52−100% selectivity (Table ). ,,− …”

Isoprene and C5 Olefins Production by Oxidative Dehydrogenation of Isopentane

“…Concerning specifically the ODH of isopentane, Rizayev et al found that the most effective system was an alumina-supported Ni−V−Sb oxide. Note that the best results were obtained at temperatures of >600 °C, with a reacting mixture of isopentane, oxygen, and water vapor (in a molecular ratio of 1:1:20, which is not much different than that used in anaerobic dehydrogenation).…”

“…It is noticeable that practically all papers on the ODH of C 5 -alkanes are devoted to the linear n-pentane and its conversion to maleic and phthalic anhydrides [18][19][20][21] or to complex mixtures of olefins and oxygenates, working at high temperatures and very short contact times. 22,23 Concerning specifically the ODH of isopentane, Rizayev et al 24 found that the most effective system was an aluminasupported Ni-V-Sb oxide. Note that the best results were obtained at temperatures of >600 °C, with a reacting mixture of isopentane, oxygen, and water vapor (in a molecular ratio of 1:1:20, which is not much different than that used in anaerobic dehydrogenation).…”