摘要
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。
The supported molybdenum catalysts were prepared by anchoring Mo(NMe2)4 and Mo2(NMe2)6 on SiO2,The temperature-programmed decomposition (TPDE) experiments and FT-IR study suggested that the dinuclear molybdenum complex was grafted on SiO2 at 110℃, which was converted into that of monomeric molybdenum species at 280℃. The supported diatomic molybdenum species derived from Mo2(NMe2)6 exhibited the specific catalytic activity for ethylene dimerization. On the other hand, Mo(NMe2)4-derived catalyst was active for ethylene metathesis and homologation reaction, but inactive for eth.ylene dimeri-zation.
关键词
钼催化剂
乙烯
二聚
同系化
歧化
Molybdenum catalyst,silicon dioxide,supported catalyst,ethylene,dimerization,homologation,metathesis
