Pd/C catalysts were prepared by various preparation methods such as ion exchange, impregnation and polyol method and also characterized by nitrogen adsorption-desorption isothermal, XRD, FE-TEM and CO-chemisorption. The activities of these catalysts were tested in the hydrogenation of cyclohexene to cyclohexane. Catalytic activities of Pd/C catalysts were found to be effected by the chosen preparation methods. Pd dispersions of each Pd/C catalysts prepared by ion exchange, impregnation and polyol method were 17.55, 13.82% and 1.35%, respectively, confirmed by CO-chemisorption analysis. These were also in good agreement with the FE-TEM results. The Pd/C catalyst prepared by ion exchange method exhibits good performance with the cyclohexene conversion rate of 71% for 15 min. These results indicate that Pd/C catalyst having higher dispersion and lower particle size is in favor of hydrogenation cyclohexene and also Pd dispersion increases with the increment of catalytic activity.

中文翻译：

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Pd / C催化剂的制备方法对Pd表征及其催化活性的影响

Pd / C催化剂是通过离子交换，浸渍和多元醇法等多种制备方法制备的，并以氮气吸附-解吸等温，XRD，FE-TEM和CO-化学吸附为特征。在环己烯加氢成环己烷中测试了这些催化剂的活性。发现Pd / C催化剂的催化活性受所选择的制备方法影响。通过CO-化学吸附分析证实，通过离子交换，浸渍和多元醇法制备的每种Pd / C催化剂的Pd分散体分别为17.55、13.82％和1.35％。这些也与FE-TEM结果非常吻合。通过离子交换法制备的Pd / C催化剂在15分钟内表现出良好的性能，环己烯转化率为71％。