羟基铬柱撑二硫化钼的制备及其对苯加氢反应的催化活性  

Preparation of Molybdenum Disulfide Composite Pillared by Hydroxy-Chromium Oligocations and Its Catalytic Activity for Benzene Hydrogenation

作　　者：张进飞[1] 林碧洲[1] 孙东亚[1] 许百环[1] 丁聪[1] 

机构地区：[1]华侨大学材料物理化学研究所,福建泉州362021

出　　处：《催化学报》2006年第12期1133-1138,共6页

基　　金：国家自然科学基金(50172016);福建省科技重大专项(2005HZ01-4;NCETFJ)资助项目.

摘　　要：采用单分子层技术将羟基铬聚合离子[Cr4（OH）6（H2O）10]^6＋嵌入到二硫化钼板层间，得到层间距为1．319～1．341nm的柱撑复合材料．X射线粉末衍射表明，羟基铬聚合物溶液经70℃恒温下陈化4d即可作为稳定的柱撑液使用；在柱撑反应体系中，较小的n（Cr）／n（Mo）比和较低的Cr^3＋浓度有利于获得结晶度较好的柱撑材料．与原料2H—MoS2相比，柱撑材料的层间距增大，晶粒变小，比表面积增加并且热稳定性提高．对催化苯饱和加氢反应表明，柱撑材料Cr—MoS2的催化活性明显优于未柱撑的2H—MoS2和Raney Ni催化剂，且结晶度较好的柱撑材料更具有较高的催化活性和较好的可重复性．The molybdenum disulfide composite material pillared by hydroxy-chromium oligocations [ Cr4 （OH）6- （H2O）10]^6＋ with the basal interlayer space from 1.319 to 1.341 nm was prepared by intercalating the hydroxy oligocations into the interlayers of molybdenum disulfide using the single-molecular-layer technology. X-ray diffraction showed that the hydroxy-chromium oligocations can be used as a stable pillaring agent after aging at 70 ℃ for four days, and a pillared composite with high crystallinity can be obtained at a small Cr/Mo molar ratio and small Cr^3＋ concentration in the reaction system. Compared with the pristine 2H-MoS2, the pillared composite exhibited larger interlayer space, smaller crystallite size, larger specific surface area, and better thermal stability. The results of liquid-phase benzene catalytic hydrogenation showed that the catalytic activity of the pil- lared composite was evidently superior to that of the pristine 2H-MoS2 and the Raney Ni catalysts, and the composite with higher crystallinity displayed even better catalytic activity and repeatability.

关 键 词：羟基铬 二硫化钼 单分子层 苯 催化加氢 

分 类 号：O643.32[理学—物理化学]