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Selective hydrogenation of benzene to cyclohexene over monometallic ruthenium catalysts in the presence of CeO2 and ZnSO4 as co-modifiers
Author(s): 
Pages: 1023-1028
Year: Issue:  10
Journal: Journal of Rare Earths

Keyword:  hydrogenationbenzenecyclohexeneRuCeO2rare earths;
Abstract: The monometallic Ru catalysts with the CeO2without calcination and ZnSO4as co-modifiers gave a cyclohexene yield of58.5% at the optimum nominal CeO2/Ru molar ratio of 0.15. Moreover, this catalyst had a good stability. The chemisorbed(Zn(OH)2)3(ZnSO4)(H2O)3salt on Ru surface, which was formed by the CeO2reacting with ZnSO4, created the new Ru active sites suitable for the formation of cyclohexene and improved the selectivity to cyclohexene. In addition, the Zn2+in the aqueous phase could form a stable complex with cyclohexene, stabilizing the cyclohexene in the liquid phase and improving the selectivity to cyclohexene. The calcination treatment of CeO2was not beneficial for the enhancement of the selectivity to cyclohexene since it is difficult for the CeO2calcinated to react with ZnSO4to form the(Zn(OH)2)3(ZnSO4)(H2O)3salt.
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