Preparation of Ru-[bmim]BF4 and Its Catalytic Performance for Selective Hydrogenation of Benzene

doi:10.3724/SP.J.1088.2011.10643

Abstract

Abstract: Ru-[bmim]BF₄ catalyst was prepared in the mixed solvent of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim]BF₄) and H₂O by chemical reduction and was characterized by ultraviolet visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results showed that Ru nanoparticles of about 2 nm were highly dispersed in the ionic liquid, and a Ru-carbene complex was obtained between imidazolium cations of [bmim]BF₄and some of Ru particles. The catalytic performance of the catalyst for benzene selective hydrogenation was evaluated. The catalyst showed poor activity but high cyclohexene selectivity in the presence of the Ru-carbene complex. Cyclohexene selectivity was up to 40.5% at 12.2% benzene conversion. When the catalyst was reused, its catalytic activity increased but the selectivity declined. This was due to the transformation from Ru-carbene complex to Ru⁰ during the reaction process. In addition, the catalytic performance of Ru-[bmim]BF₄ remained stable when it was reused further.

Key words: ruthenium, 1-butyl-3-methylimidazolium tetrafluoroborate, ruthenium-carbene complex, benzene, selective hydrogenation, cyclohexene

QIN Yan-Fei, XUE Wei, LI Fang, WANG Yan-Ji, WEI Jun-Fang. Preparation of Ru-[bmim]BF4 and Its Catalytic Performance for Selective Hydrogenation of Benzene[J]. Chinese Journal of Catalysis, 2011, 32(11): 1727-1732.

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