Effect of coexistence of magnesium vanadate phases in the selective oxidation of propane to propene

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1185· OSTI ID:7034753

Gao, Xingtao; Xin, Qin; Guo, Xiexian ^[1]; Ruiz, P; Delmon, B ^[2]

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1. Dalian Institute of Chemical Physics (China)
2. Universite Catholique de Louvain, Louvain-la-Neuve (Belgium)

The study of oxidative dehydrogenation of propane was carried out over V-Mg-O catalysts. The citrate method was used to prepare catalysts with the Mg/V atomic ratio varying from 1/4 to 9.1. Three pure Mg vanadates and the corresponding biphasic catalysts were obtained from very homogeneous Mg-V-citrate precursors after calcination at 550[degrees]C. Among the three pure Mg vanadates, [alpha]-Mg[sub 2]V[sub 2]O[sub 7] (pyrovanadate) was found to be the most selective, while MgV[sub 2]O[sub 6] (metavanadate) is the worst one. Interestingly, the catalytic behavior of biphasic catalysts is quite different from the of pure Mg vanadate phases. For example, the selectivity of Mg[sub 3]V[sub 2]O[sub 8] (orthovanadate) can be promoted by a coexisting pyrovanadate phase or excess magnesium oxide in intimate contact. These differences are discussed in terms of the different specific activities of phases and possible synergy effects between the phases. 25 refs., 11 fig., 5 tabs.

• OSTI ID: 7034753
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 148:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METAL COMPOUNDS
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ALKENES
CATALYSIS
CATALYTIC EFFECTS
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