Propane Oxidative Dehydrogenation on BiP1-xVxO4 Supported Titania Catalysts

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Ouchabi Mbarka; Loulidi Ilyasse; Agunaou Mahfoud

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Journal Paper

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Journal: IRANIAN JOURNAL OF CATALYSIS Year:2022 | Volume:12 | Issue:4 Page(s): 475-487

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Title

Propane Oxidative Dehydrogenation on BiP1-xVxO4 Supported Titania Catalysts

Author(s)

Ouchabi Mbarka | Loulidi Ilyasse | Agunaou Mahfoud | Issue Writer Certificate

Keywords

BiP1-xVxO4/TiO2 catalyst

methanol oxidation

Propane oxidative dehydrogenation

Abstract

The molecularly dispersed BiP1-xVxO4/TiO2 supported materials, with x varying from 0 to 1, were prepared by impregnation of Bismuth, Phosphorus, and Vanadium on a Titanium Oxide TiO2 support. Their structures were characterized by different techniques including X-ray diffraction, Spectroscopic Raman, temperature-programmed reduction of the catalysts in H2 (H2-TPR), and by the methanol oxidation reaction. This very sensitive technique provided us with relevant information on the nature of the catalytic active sites (acid-base and redox) of the phases dispersed on the support. The characterization results show the structural evolution of BiP1-xVxO4 species, from isolated BiPO4 crystallites for x =0, to BiVO4 crystallites x =1. The oxidation of methanol showed the acidic properties of the BiPO4/TiO2 catalyst, through the formation of dimethyl ether as the major product of the reaction. The substitution of phosphorus by vanadium promotes the formation of formaldehyde, confirming the presence of redox sites. These catalysts were examined in the oxidative dehydrogenation (ODH) of propane to propene. For x > 0. 5, dispersed BiVO4 exhibited higher levels of propane ODH than BiPO4 crystallites, consistent with their greater reducibility probed by temperature-programmed reduction of H2 and the presence of redox sites confirmed by methanol oxidation, with good selectivity to propene. Catalysts with x = 0, were less selective to propene due to favorable propylene combustion during its formation. A thorough understanding of the intrinsic catalytic properties of the BiP1-xVxO4/TiO2 oxides and in particular the BiPO4 and BiVO4 crystallites provides relevant information on the structural requirements of the propane ODH reaction, of interest for the design of more efficient Bi-P-V-O based catalysts for propene production. The results show that all substituted catalysts exhibit significant propene selectivity. In addition, the BiP0. 7V0. 3O4/TiO2 catalyst exhibits high activity with good propene selectivity. This catalytic activity was correlated with high reducibility.

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APA: Copy

Ouchabi, Mbarka, Loulidi, Ilyasse, & Agunaou, Mahfoud. (2022). Propane Oxidative Dehydrogenation on BiP1-xVxO4 Supported Titania Catalysts. IRANIAN JOURNAL OF CATALYSIS, 12(4), 475-487. SID. https://sid.ir/paper/1065559/en

Vancouver: Copy

Ouchabi Mbarka, Loulidi Ilyasse, Agunaou Mahfoud. Propane Oxidative Dehydrogenation on BiP1-xVxO4 Supported Titania Catalysts. IRANIAN JOURNAL OF CATALYSIS[Internet]. 2022;12(4):475-487. Available from: https://sid.ir/paper/1065559/en

IEEE: Copy

Mbarka Ouchabi, Ilyasse Loulidi, and Mahfoud Agunaou, “Propane Oxidative Dehydrogenation on BiP1-xVxO4 Supported Titania Catalysts,” IRANIAN JOURNAL OF CATALYSIS, vol. 12, no. 4, pp. 475–487, 2022, [Online]. Available: https://sid.ir/paper/1065559/en

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