Selective hydrogenation of benzene to cyclohexene on Ru/γ-Al2O3
Selective hydrogenation of benzene to cyclohexene on Ru/γ-Al2O3
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DOI：
10.1006/jcat.1996.0086
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发表时间：
1996-04
影响因子：
7.3
通讯作者：
C. Milone;G. Neri;A. Donato;M. Musolino;L. Mercadante
中科院分区：
文献类型：
--
作者：
C. Milone;G. Neri;A. Donato;M. Musolino;L. Mercadante
摘要研究了水存在下Ru/Al 2 O3催化剂上苯加氢制环己烯的反应。研究了反应条件、钌前体和催化剂预处理对反应的影响。该反应在动力学控制和强传质限制下进行。在水的存在下，环己烯的形成不能简单地归因于物理效应。然而，传质限制对于在高转化率下获得高选择性是重要的。在不存在苯的情况下，在氢气下对催化剂进行预处理，提高了对环己烯的选择性。当在氮气下进行预处理时，没有观察到效果。由RuCl 3制备的催化剂相对于由无氯前体制备的样品更具选择性。
Abstract Hydrogenation of benzene to cyclohexene has been studied over Ru/Al 2 O 3 catalysts in the presence of water. Attention has been paid to the influence of reaction conditions, ruthenium precursors, and catalyst pretreatment. The reaction was carried out under kinetic control and under strong mass transfer limitation. In the presence of water the formation of cyclohexene cannot be simply ascribed to physical effects. Mass transfer limitations are, however, important to obtain high selectivities at high conversion. A pretreatment of the catalyst under hydrogen, in the absence of benzene, increases the selectivity to cyclohexene. No effect has been observed when the pretreatment is carried out under nitrogen. Catalysts prepared from RuCl 3 are more selective with respect to samples prepared from chlorine-free precursors.