2005•Journal of Molecular Catalysis(China)Requires access
Study on Ru-M_1-M_2 Catalyst Prepared by Precipitation Method for Selective Hydrogenation of Benzene to Cyclohexene
Ke Wang
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Abstract
A new biassistant Ru-M_1-M_2/ZrO_2 catalyst for high selective partial hydrogenation of benzene to cyclohexene was prepared by precipitation method which involves ruthenium (Ⅲ) chloride and zinc sulphate and lanthanum (Ⅲ) chloride co-precipitation with sodium hydroxide and zirconium dioxide as supports. The influence of Ru/ZrO_2 ratio, assistants and loading, alkali metal ions, incorporation of zinc sulphate on the catalytic activity and selectivity of the Ru-based catalysts have been investigated. The best results obtained were that Ru/ZrO_2 = 10%, (Zn+La)/Ru = 8%, La/Zn = 1∶3. Increased cyclohexene yields and selectivities have also been observed in the presence of alkali metal ions. And the incorporation of zinc sulphate enhanced the sedimentation performance and favored the selectivity of Ru-M_1-M_2/ZrO_2 catalysts. Temperature programmed reduction, X-ray diffraction analyses and surface area measurements were used as tools for characterizing the catalysts. And the catalyst of Ru-La-Zn/ZrO_2 was explained on the molecular level.