Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru鈥揃/ZrO2 Catalysts

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• 作者：Gongbing Zhou ; Jianliang Liu ; Xiaohe Tan ; Yan Pei ; Minghua Qiao ; Kangnian Fan ; Baoning Zong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：September 26, 2012
• 年：2012
• 卷：51
• 期：38
• 页码：12205-12213
• 全文大小：440K
• 年卷期：v.51,no.38(September 26, 2012)
• ISSN：1520-5045

文摘

Ru鈥揃/ZrO₂ catalysts using monoclinic, amorphous, and tetragonal ZrO₂ as supports were prepared and used for liquid-phase hydrogenation of benzene to cyclohexene. It is identified that both the Lewis acid sites and the Br酶nsted acid sites existed on monoclinic ZrO₂ (ZrO₂-M), while there were only Lewis acid sites on amorphous (ZrO₂-A) and tetragonal ZrO₂ (ZrO₂-T). The amount of acid sites on ZrO₂-T was the lowest. In liquid-phase hydrogenation of benzene to cyclohexene, the Ru鈥揃/ZrO₂-T catalyst exhibited the highest selectivity and yield of cyclohexene, with the maximum yield of cyclohexene being 47%. These results suggest that for ZrO₂-supported Ru鈥揃 catalysts, the lower was the amount of acid sites on ZrO₂, the higher was the selectivity to cyclohexene. Also, the presence of the Br酶nsted acid sites on ZrO₂ is probably adverse to the selectivity toward cyclohexene.