催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (12): 1133-1138.

• 研究论文 • 上一篇    下一篇

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

张进飞,林碧洲,孙东亚,许百环,丁聪   

  1. 华侨大学材料物理化学研究所, 福建泉州 362021
  • 收稿日期:2006-12-25 出版日期:2006-12-25 发布日期:2006-12-25

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

ZHANG Jinfei, LIN Bizhou*, SUN Dongya, XU Baihuan, DING Cong   

  1. Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou 362021, Fujian, China
  • Received:2006-12-25 Online:2006-12-25 Published:2006-12-25

PDF

778

被引次数

8

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1.319～1.341 nm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4 d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Cr3+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.

关键词: 羟基铬, 二硫化钼, 单分子层, 苯, 催化加氢

Abstract: 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 Cr3+ 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 pillared 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.

Key words: hydroxy-chromium, molybdenum disulfide, single molecular layer, benzene, catalytic hydrogenation