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从单核及双核二甲胺钼络合物出发,制备了SiO_2负载的钼催化剂。程序升温分解实验(TPDE)及红外测试表明,双核钼络合物与SiO_2作用生成双钼中心物种,此物种可催化乙烯的二聚反应。280℃活化后此双钼中心物种变成单钼中心物种,单钼物种只催化乙烯的同系化及歧化反应。
Starting from mononuclear and dinuclear dimethylamine molybdenum complexes, a molybdenum-based catalyst supported on SiO 2 was prepared. The results of programmed pyrolysis (TPDE) and infrared measurements show that the dual-core molybdenum complex interacts with SiO 2 to form double molybdenum central species, which can catalyze the dimerization of ethylene. After activation at 280 ℃, the double-molybdenum center species becomes a monomolybdenum central species, while the single-molybdenum species catalyzes the homologation and disproportionation reactions of ethylene.