以有机镍配合物为前体制备担载镍催化剂的研究

PREPARATION OF SILICA-SUPPORTED NICKEL CATALYSTS DERIVED FROM ORGANO-NICKEL COMPLEXES

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.