SBA-15中异双核金属配合物的结构和催化性能

Structure and catalytic performance in cyclohexane oxidation of macrocyclic heterodinuclear complexes encapsulated in SBA-15

合成了四个具有混合价态的大环d-f异双核配合物[M1M2L](NO3)(H2O)n(L代表配体)。采用浸渍法将四个d-f异双核配合物分别固载在中孔分子筛SBA-15上制得负载催化材料。SBA-15采用微波加热法合成。IR、UV-vis、XRD、ICP-AES和TG/DTA技术表征表明,异双核配合物被固载后,配合物结构仍保持完整。以环己烷氧化为探针反应,考察了上述负载催化材料的催化性能,并分析了不同金属离子或取代基对催化剂活性及选择性的影响。同时还系统考察了溶剂、反应时间、反应温度、对环己烷氧化反应的影响。结果表明,该催化剂在环己烷氧化反应中具有较好的活性及稳定性。

Four macrocyclic d-f heterodinuclear complexes [M1M2L] (NO3)(H2O)n (L, ligand) were synthesized and characterized. The complexes with different valences were then immobilized on mesoporous SBA-15 synthesized by microwave heating. The samples are characterized by IR, UV-vis, XRD, ICP-AES, TG/DTA and used as catalysts in the oxidation of cyclohexane with H2O2 as an oxidant. The influences of solvent, reaction temperature, and time on the conversion of cyclohexane were examined. The complexes encapsulated in SBA-15 exhibit excellent catalytic activity and stability in cyclohexane oxidation with H2O2.