Ru-Zn catalysts for selective hydrogenation of benzene using coprecipitation in low alkalinity

doi:10.1016/S1872-2067(14)60231-X

Abstract

Abstract:

Several unsupported Ru-Zn catalysts were successfully prepared using the coprecipitation method under low alkaline conditions, and their catalytic performance was evaluated for the selective liquid-phase hydrogenation of benzene. The effect of the amount of ZnCl₂ added to the coprecipitation solution on the physical and catalytic properties of the Ru-Zn catalysts was studied whilst keeping the amount of the NaOH precipitant constant. The properties of the resulting catalysts were characterized by N₂ adsorption, X-ray diffraction, and temperature-programmed reduction. The effects of the stirring rate and the amount of ZnSO₄ additive on the catalytic properties of the Ru-Zn catalysts were investigated using the optimal Zn content. The recyclability of the optimal Ru-Zn catalyst was also explored. The results revealed that the optimal Zn content for the Ru-Zn catalysts was 16.7 wt%, and the selectivity for cyclohexene could reach up to 80% (yield > 45%) when the benzene conversion was 57% in an aqueous solution of ZnSO₄ (0.45 mol/L) under the optimal reaction conditions (i.e., hastelloy reactor, 1200 r/min, 150 ℃ and 5 MPa of H₂ pressure). The presence of ZnO crystals in the Ru catalysts was found to be critical to obtaining high selectivity for cyclohexene (>80%). The Ru-Zn catalysts prepared under the low alkaline conditions also showed good stability, which indicates that they could potentially be used for industrial application.

Key words: Coprecipitation, Low alkalinity, Benzene, Selective hydrogenation, Ru-Zn catalyst

Zhengbao Wang, Qi Zhang, Xiaofei Lu, Shuangjia Chen, Chunjie Liu. Ru-Zn catalysts for selective hydrogenation of benzene using coprecipitation in low alkalinity[J]. Chinese Journal of Catalysis, 2015, 36(3): 400-407.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60231-X

https://www.cjcatal.com/EN/Y2015/V36/I3/400

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