Ru(Schiff-base)/Y复合材料对苯加氢反应的催化性能研究

Catalysis of Ru(Schiff-base)/Y composite catalysis for benzene hydrogenation

一种新的低温苯加氢催化剂Ru(Sch iff-base)金属配合物,通过自由配体法封装于Y型沸石的孔腔中。使用XRD、N2吸附、FT-IR、DRS、DTA对催化剂进行表征。结果表明,复合催化剂中希夫碱(Sch iff-base)配体改变了中心离子的电子结构,使其更容易与反应物分子形成配位过渡态,络合活化的反应物分子更容易转化为产物。与离子交换法制备的母体Ru/Y相比,对纯苯的催化加氢性能明显提高。希夫碱配体的几何尺寸对复合材料的催化性能也有很大影响。

Ru（Schiff-base） complex, a novel catalyst for benzene hydrogenation at low temperature, was encapsulated in the supercages of zeolite Y by flexible ligand method. The results of XRD, N2-desorption, FT-IR, DRS, DTA and catalytic reaction show that Schiff-base ligands in the prepared composite catalyst changed the electronic state of central metal atom, thus made the catalyst to form transition coordinative state with reaction substrate more easily and facilitating the product formation. Compared with Ru/Y prepared by ion-exchange method, in pure benzene hydrogenation, the catalytic activity of Ru （Schiff-base）/Y increased significantly. Simultaneously, the geometry size of different Schiff-base ligands has strong influence on the catalytic performance of prepared composite catalysts.