沉淀剂对Ru-Zn催化剂催化苯选择加氢性能的影响

采用共沉淀法制备Ru-Zn催化剂，考察了沉淀剂种类、沉淀pH值对其催化苯选择性加氢性能的影响，并采用N2物理吸附、XRD、SEM、H2-TPR对催化剂进行了表征。结果表明，以NaOH为沉淀剂，沉淀pH=7时制备的Ru-Zn-f催化剂性能较好，苯转化率为40%时，环己烯选择性为82.70%，且该催化剂重复使用5次后，环己烯选择性仍维持在81%以上，稳定性好，具有较好的工业应用前景。

Influence of precipitants on catalytic performance of Ru-Zn catalysts in selective hydrogenation of benzene to cyclohexene

Ru-Zn catalysts were prepared by the co-precipitation method, and the effect of different precipitants and pH values on the performance of the catalysts for selective hydrogenation of benzene to cyclohexene was investigated. The catalysts were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM) and H2 temperature-programmed reduction (H2-TPR). The results showed that pH could modify the specific surface area and Zn contents, and then affect the catalytic performance. The catalyst prepared using NaOH as the precipitant and at pH value of 7 displayed higher activity in the benzene selective hydrogenation than those obtained by other precipitants and at different pH values, and the selectivity for cyclohexene could reach up to 82.7% while the benzene conversion was 40%. Moreover, the catalyst had excellent reusability. The selectivity of cyclohexene remained above 81% after it was recycled for 5 times, a promising profile for its industrial application.