铌基催化剂精准活化木质素C(aromatic)-C键的催化本质研究

木质素催化氢解制备芳香类化学品具有广泛的工业应用前景，而氢解过程中C-C键的精准活化是提高木质素碳利用率的关键。我们在前期研究中发现，Ru/Nb基催化剂具有选择氢解C(aromatic)-C键，同时抑制其它类型C-C键断裂的特性。本项目拟从NbOx对C(aromatic)-C键的精准活化，及NbOx与Ru的相互作用对C(aromatic)-C键的选择性氢解出发，考察不同氧化物负载的Ru催化剂在苯基环己烷氢解反应中的催化性能，探究铌基材料在C(aromatic)-C键氢解中独特作用；研究模型分子在铌基材料表面的吸附、活化和氢解过程,充分认识铌基材料在C(aromatic)-C键活化中的作用本质；对比不同金属/氧化物的物化性质和催化性能，深入理解加氢中心Ru与C-C键活化中心NbOx在苯基环己烷氢解反应中的协同机制，为靶向合成具有C(aromatic)-C键活化性能的高效催化剂提供新思路。

The preparation of aromatic chemicals by catalytic hydrogenolysis of lignin has broad industrial application prospect, and the precise activation of C-C linkages in the hydrogenolysis of lignin is the key to enhance the utilization ratio of carbon in lignin. In our previous studies, we found that the Ru/NbOx catalyst has excellent activity for selective hydrogenolysis of C(aromatic)-C bonds, meanwhile it avoids the cleavage of other C-C bonds. This project intends to start with the precise activation of C(aromatic)-C bonds by NbOx and the selective hydrogenolysis by a synergistic effect between NbOx and Ru, by compared with catalyst performance of various oxides loaded Ru-based catalysts in the hydrogenolysis of phenylcyclohexane, in order to explore the unique role of NbOx in hidrogenolysis of C(aromatic)-C bonds. The adsorption, binding and reaction of phenylcyclohexane on niobium-based catalyst will be studied, in order to explore the nature of the role of niobium-based materials in the activation of C(aromatic)-C bonds. Reveal the synergetic mechanism of hydrogenation centers Ru and C-C activation centers NbOx in the hydrogenolysis of phenylcyclohexane, through studying physicochemical property and catalyst performance of various oxides loaded Ru-based catalysts. Meanwhile, the relationship between catalyst composition structure and performance will be established. It would be believed to provide a novel idea for the controlled synthesis of excellent catalyst with precise C(aromatic)-C activation and hydrogenolysis.