Selective Hydrogenolysis of Methylcyclopentane in the Presence of Excess Methylcyclohexane Using Ir/SiO2 Catalyst

INAGAKI Satoshi, MAEKAWA Yuki, ORUI Yuki, WAKATSUKI Rikuto, NISHI Yuko, HIYOSHI Norihito, KUBOTA Yoshihiro

doi:10.1627/jpi.66.57

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Ir/SiO2触媒でのメチルシクロヘキサンの共存下でのメチルシクロペンタンの選択的加水素分解
Selective Hydrogenolysis of Methylcyclopentane in the Presence of Excess Methylcyclohexane Using Ir/SiO₂ Catalyst

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Methylcyclohexane (MCH) is a promising candidate for use as a liquid organic hydrogen carrier, but is isomerized into undesirable five-membered-ring compounds with similar boiling points to MCH, so purification requires selective conversion of the five-membered-ring compounds without reaction of the MCH. We found that an Ir/SiO₂ catalyst efficiently promoted the selective hydrogenolysis of methylcyclopentane (MCP), a model five-membered-ring compound, in the presence of excess MCH in the reaction system. Ir/SiO₂ and Rh/SiO₂ catalysts provided high conversions in the hydrogenolysis of MCP at 200 °C, whereas almost no reaction of MCH occurred. In contrast, Pt/SiO₂ catalyst was almost inactive in the hydrogenolysis of both MCP and MCH at 200 °C. The difference in reactivities for the Ir/SiO₂ and Rh/SiO₂ catalysts can be explained by the relatively high strain energy and formation enthalpy of MCP compared to MCH. The Ir/SiO₂ catalyst also preferentially promoted the hydrogenolysis of ethylcyclopentane, which is a more realistic impurity, in the presence of excess MCH.

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Journal of the Japan Petroleum Institute

Journal of the Japan Petroleum Institute 66 (2), 57-67, 2023-03-01

The Japan Petroleum Institute

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Selective Hydrogenolysis of Methylcyclopentane in the Presence of Excess Methylcyclohexane Using Ir/SiO<sub>2</sub> Catalyst