Partial hydrogenation of benzene over the metallic Zn modified Ru-based catalyst
Partial hydrogenation of benzene over the metallic Zn modified Ru-based catalyst
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DOI：
10.1016/j.molcata.2009.05.006
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发表时间：
2009-08
影响因子：
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通讯作者：
Peiqing Yuan;Bing-Qiang Wang;Yue-Ming Ma;Hui He;Zhenmin Cheng;W. Yuan
中科院分区：
文献类型：
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作者：
Peiqing Yuan;Bing-Qiang Wang;Yue-Ming Ma;Hui He;Zhenmin Cheng;W. Yuan
从吸附的角度对金属锌改性钌基催化剂上苯部分加氢制环己烯进行了实验和理论研究。在苯部分加氢反应中，Ru-Zn/ZrO 2催化剂的加氢活性降低，但环己烯的选择性提高。理论计算表明，上述现象主要是由于苯和环己烯在改性催化剂上的化学吸附受到抑制，尤其是后者。因此，有效地阻止了在反应中后期由环己烯到环己烷的不期望的深度加氢，从而保证了提高的环己烯收率。最佳Zn含量为2.72wt.%通过实验和计算，提出了Ru基催化剂中的催化剂活性组分，在Ru-Zn/ZrO 2催化剂上，苯部分加氢的环己烯收率可达44%。
From the adsorption point of view, partial hydrogenation of benzene to cyclohexene over the metallic Zn modified Ru-based catalyst was experimentally and theoretically investigated. A decreased hydrogenation activity but increased selectivity to cyclohexene over the prepared Ru-Zn/ZrO2catalyst was observed in the partial hydrogenation of benzene. Theoretical calculations suggest that the above phenomena are mainly resulted from the depression of the chemisorption of benzene and cyclohexene on the modified catalyst, especially for the latter. Undesired deep hydrogenation from cyclohexene to cyclohexane in the middle and late reaction stage therefore is effectively retarded, by which an improved cyclohexene yield is guaranteed. An optimal Zn content of 2.72wt.% in the Ru-based catalyst was proposed by both the experiment and calculation for the partial hydrogenation of benzene, and a cyclohexene yield up to 44% was obtained over Ru-Zn/ZrO2catalyst.