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采用表面改性和离子交换法制备了SiO2 负载的Ti2 (OMe) 4双核桥联配合物催化剂 ,用IR、TPD和微反技术考察了催化剂的表面构造及CO2 和CH3OH在催化剂表面上的化学吸附和反应性能。结果表明 :双核桥联配合物Ti2 (OMe) 4以Ti—O—Si键锚定在SiO2 表面上 ;CO2 在催化剂表面存在桥式和甲氧碳酸酯基两种吸附态 ,其中甲氧碳酸酯基吸附态是生成DMC的关键物种 ;CH3OH在催化剂上只有一种分子吸附态。在 15 0℃以下 ,CO2 和CH3OH在Ti2 (OMe) 4 SiO2 催化剂表面上高选择地生成碳酸二甲酯。
The TiO2 supported Ti2 (OMe) 4 binuclear bridged complex catalysts were prepared by surface modification and ion exchange. The surface structures of the catalysts and the chemisorption of CO2 and CH3OH on the surface of the catalysts were investigated by IR, TPD and micro-reverse techniques And reaction performance. The results show that Ti2 (OMe) 4 is anchored on the surface of SiO2 by Ti-O-Si bonds, and there are two kinds of adsorption states of CO2 and CO2 on the surface of catalyst. Among them, Base adsorption state is the key species to generate DMC; CH 3 OH has only one kind of molecular adsorption state on the catalyst. At temperatures below 15 0 C, dimethyl carbonate was selectively formed on the surface of Ti2 (OMe) 4 SiO2 catalyst by CO2 and CH3OH.