Colloidal RuB/Al 2O 3 xH 2O catalyst for liquid phase hydrogenation of benzene to cyclohexene
Colloidal RuB/Al 2O 3 xH 2O catalyst for liquid phase hydrogenation of benzene to cyclohexene
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DOI：
10.1016/j.molcata.2004.08.009
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发表时间：
2004-11
影响因子：
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通讯作者：
Jian‐Qiang Wang;Pingjun Guo;Shirun Yan;M. Qiao;Hexing Li;Kangnian Fan
中科院分区：
文献类型：
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作者：
Jian‐Qiang Wang;Pingjun Guo;Shirun Yan;M. Qiao;Hexing Li;Kangnian Fan
采用共沉淀-结晶-还原相结合的方法合成了胶体RuB/Al_2O_3·xH_2O催化剂，并用电感耦合等离子体原子发射光谱、氮气物理吸附、X射线衍射仪、热重/差热分析、X射线衍射仪和透射电子显微镜对催化剂进行了表征。考察了苯液相选择加氢制环己烯催化剂的催化性能，并与浸渍法制备的RuB/γ-Al_2O_3催化剂进行了比较。与RuB/γ-Al_2O_3催化剂相比，RuB/Al_2O_3·xH_2O催化剂具有更高的反应活性，环己烯的最高产率约为后者的4倍。胶体催化剂的活性较好是由于较小的摩擦粒子的分散性较高，而其良好的选择性则归因于较高的结构水含量和表面羟基含量而改善了亲水性。
A colloidal RuB/Al2O3·xH2O catalyst has been synthesized through a combined coprecipitation–crystallization–reduction strategy and characterized in detail with techniques including ICP-AES, N2physisorption, XRD, TG/DTA, PSD and TEM. The catalytic behavior in liquid phase selective hydrogenation of benzene to cyclohexene was studied and compared with that of the RuB/γ-Al2O3catalyst prepared by the incipient-wetness impregnation method. The RuB/Al2O3·xH2O catalyst is found more reactive than the RuB/γ-Al2O3catalyst, and the maximum yield of cyclohexene is about four times as high as that over the latter. The better activity of the colloidal catalyst is assigned to the higher dispersion of the smaller RuB particles, whereas its superior selectivity is attributed to the improved hydrophilicity due to higher content of structural water and surface hydroxyl groups.