负载型双氯基桥联双核铜(Ⅱ)配合物催化剂的合成、表征及化学吸附性质

Supported μ-Dichloro Bridged Dicopper (Ⅱ) Complex Catalysts Synthesis, Characterization and Chemisorption Properties

采用金属离子嫁接法 ,合成了以 μ- dichloro为桥基配体的双核铜 ( )配合物 .采用表面改性和金属嫁接相结合的方法 ,制备了 Si O2 负载的双核配合物催化剂 Cu2 Cl2 / Si O2 .络合滴定和红外光谱分析表明 ,在改性后的Si O2 表面上铜 ( )离子以双齿配位形式键合 .用络合滴定、红外及 U V- vis光谱分析法 ,表征了载体表面的双核桥联结构 .运用分子探针红外技术 ,研究了催化剂对 CO2 和环氧乙烷 (EO)的化学吸附特性 .研究结果表明 ,在催化剂表面路易斯酸和碱中心的协同作用下 ,两种分子形成桥式吸附态 .

Dichloro bridged dicopper(Ⅱ) complex was synthesized by the method of grafting metal ions. Silica supported dinuclear complex catalyst was prepared by modification of SiO 2 with anchoring metal ions, namely Cu 2Cl 2/SiO 2. The bidentate coordination mode of copper(Ⅱ) ions on the modified SiO 2 surface was evidenced by complex titration and IR spectra. The existence of dinuclear structure on the SiO 2 surface was characterized by IR and UV vis analysis and titration method. Chemisorption of catalysts to CO 2 and EO (ethylene oxide) was investigated by molecular probing IR technique. Based on the experimental results, CO 2 and EO was proposed to be chemisorbed in the form of bridged structure under the synergy of Lewis acid and Lewis base sites on the surface of catalyst.