Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

doi:10.1016/S1872-2067(11)60412-9

催化学报 ›› 2012, Vol. 33 ›› Issue (9): 1474-1479.DOI: 10.1016/S1872-2067(11)60412-9

Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

Ahmed AOUISSI*, Daif ALDHAYAN, Saad ALKAHTANI

Chemistry Department, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia

收稿日期:2012-03-20 修回日期:2012-05-12 出版日期:2012-09-11 发布日期:2012-09-11

Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

Ahmed AOUISSI*, Daif ALDHAYAN, Saad ALKAHTANI

Chemistry Department, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia

Received:2012-03-20 Revised:2012-05-12 Online:2012-09-11 Published:2012-09-11

摘要/Abstract

摘要： Molybdenum based oxide catalysts Mo-H, Mo-Fe, Mo-Ce, and Mo-Sn were prepared by calcining H₃PMo₁₂O₄₀, Fe_1.5PMo₁₂O₄₀, Ce_1.5PMo₁₂O₄₀, and Sn_1.5PMo₁₂O₄₀ heteropolyanion precursors at 700 °C, respectively. The prepared oxides have been characterized and tested for the dehydrogenation of isobutane (IB) to isobutene in the presence of CO₂. The effects of temperature, time on stream, and CO₂/IB ratio were investigated. It was found that α- and b-MoO₃phases were present in all catalysts. Catalytic tests showed that increasing the reaction temperature increased both the conversion and isobutene selectivity, whereas increasing the CO₂/IB molar ratio increased the conversion but decreased the selectivity for isobutene. Iron was found to be an effective additive element for the enhancement of catalytic activity compared with Ce and Sn.

关键词: isobutane, isobutene, heteropoly compound, mixed oxide, carbon dioxide

Abstract: Molybdenum based oxide catalysts Mo-H, Mo-Fe, Mo-Ce, and Mo-Sn were prepared by calcining H₃PMo₁₂O₄₀, Fe_1.5PMo₁₂O₄₀, Ce_1.5PMo₁₂O₄₀, and Sn_1.5PMo₁₂O₄₀ heteropolyanion precursors at 700 °C, respectively. The prepared oxides have been characterized and tested for the dehydrogenation of isobutane (IB) to isobutene in the presence of CO₂. The effects of temperature, time on stream, and CO₂/IB ratio were investigated. It was found that α- and b-MoO₃phases were present in all catalysts. Catalytic tests showed that increasing the reaction temperature increased both the conversion and isobutene selectivity, whereas increasing the CO₂/IB molar ratio increased the conversion but decreased the selectivity for isobutene. Iron was found to be an effective additive element for the enhancement of catalytic activity compared with Ce and Sn.

Key words: isobutane, isobutene, heteropoly compound, mixed oxide, carbon dioxide

Ahmed AOUISSI, Daif ALDHAYAN, Saad ALKAHTANI. Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors[J]. 催化学报, 2012, 33(9): 1474-1479.

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Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

Conversion of Isobutane in Presence of Carbon Dioxide over Molybdenum Oxide Catalysts Obtained from Heteropolymolybdate Precursors

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