摘要
描述了以镍单核配合物NiCp2和簇合物Ni3Cp3N-t-C4H9为前体的SiO2载镍催化剂的制备.通过元素分析、TPR、TPDE、XPS,CO吸附和苯加氢反应对以镍配合物和簇合物为前体制备的催化剂的性能及其制备过程进行了研究和表征.结果表明,镍配合物和簇合物在担载过程中同载体SiO2表面发生了相互作用,其化学组成发生了变化,在苯加氢反应中,此催化剂的活性比以Ni(NO3)2为前体制备的催化剂高得多,这可归结为此催化剂还原较易和分散度较高.
The preparation of silica-supported nickel catalysts derived from organo-nickel complexes, NiCp2 or Ni3Cp3N-t-C4H9, as described.The formation and catalytic properties of catalysts were studied and characterized by elemental analysis, XPS, TPDE, TPR, CO adsorption and benzene hydrogenation. After being supported, the chemical composition and properties of the complexes were changed, the molar ratioof elements decreased, while the binding energy of Ni2p3/2 increased a little. Instead of subliming, the supported complexes decomposed and reduced gradually in the experiments, indicating an interaction occurredbetween the complexes and the surface of silica. Comparing with the supported NiO,the nickel in supported complexes can be reduced at much lower temperature. The catalysts revealed much higher activity in benzene hydrogenation than the catalyst derived from nickel nitrate.This was attributed to their high dispersion and reducibility.
基金
国家自然科学基金
关键词
镍
配合物
二氧化硅
苯
加氢反应
organo-nickel complex, supported nickel catalyst, silica support, benzene hydrogenation