本発表では、環状オレフィンの開環メタセシス重合などに高い触媒活性を示す、芳香族イミド配位子を有するニオブ-アルキリデン錯体の合成と活性への配位子効果に関する。特にフッ素化アルコキソ配位子やフッ素化フェノキシ配位錯体が､従来触媒より遙かに優れた触媒性能を示すことを最近見出した。発表ではその詳細を報告する。

Recently, amounts of researches focus on lignin depolymerization and the application of its downstream derivatives. Various acid/base catalytic or noncatalytic methods, combined with oxidants or reducing agents, had been explored to depolymerize lignin. In the present studies, we explored the effects of different ionic liquids (ILs) on various lignin depolymerization in ethylene glycol (EG) using a continuous flow fixed-bed reactor. A high aromatics yield was obtained under low basicity environment. Besides, we also analyzed the factors influencing the condensation process of diverse fragments from lignin degradation and brought forward the possible lignin conversion mechanism.

Nitrogen-doped carbon-supported cobalt was employed as a non-noble metal catalyst to study the reaction kinetics of concentrated aqueous solutions of acetal-protected 5-hydroxymethylfurfural to furan-2,5-dicarboxylic acid in high yield, using pressurized air as oxidant.