Selective Hydrogenation of Benzene to Cyclohexene over a Ru-Zn Catalyst with Diethanolamine as an Additive

doi:10.1016/S1872-2067(11)60351-3

Abstract

Abstract: A Ru-Zn catalyst was prepared by co-precipitation, and the effect of adding diethanolamine on benzene selective hydrogenation to cyclohexene was investigated. The catalyst was characterized by N₂ physisorption, transmission electron microscopy, X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectra, and temperature-programmed reduction. Diethanolamine reacted with ZnSO₄ in the slurry to form (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃ and diethanolamine sulfate. The amount of (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃adsorbed on the catalyst surface increased with the increase of diethanolamine amount. The synergism of (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃ and diethanolamine sulfate improved the cyclohexene selectivity of the Ru-Zn(4.9%) catalyst. With a diethanolamine dosage of 0.3 g, (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃ was highly dispersed on the catalyst surface and the sample after hydrogenation was characterized, and this catalyst exhibited the best performance with a cyclohexene selectivity and yield of 75.5% and 63.6%, respectively, at the benzene conversion of 84.3% in the third run. Moreover, the benzene conversion and cyclohexene selectivity were stable above 75% and cyclohexene yields were above 58% in fourth run.

Key words: diethanolamine, ruthenium, zinc, benzene, selective hydrogenation, cyclohexene

SUN Hai-Jie, PAN Ya-Jie, WANG Hong-Xia, DONG Ying-Ying, LIU Zhong-Yi, LIU Shou-Chang. Selective Hydrogenation of Benzene to Cyclohexene over a Ru-Zn Catalyst with Diethanolamine as an Additive[J]. Chinese Journal of Catalysis, 2012, 33(4): 610-620.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(11)60351-3

https://www.cjcatal.com/EN/Y2012/V33/I4/610

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