Encapsulation And Characterization Of Metal-phthalocyanine Complex In Microporous Molecular Sieve

Metal phthalocyanine(MPc) is an important macrocyclic complex of 18-Ï€conjugated system and particular physical and chemical characteristics. MPc is a good catalyst for oxygen and peroxide oxidation. The encapsulation of MPc in molecular sieve has become a hot spot in the field of catalytic materials, due to not only the higher catalytic activity, selectivity and stability, but also the unique site isolation, heterogenized homogeneous and recycle of catalyst. At the same time, MPc has attracted considerable interests in enzyme-like catalyst aspect.At present time, the researches in the field mainly concentrated on their preparation, characterization and catalytic properties, among of which the research of the electrochemical properties of metal complexes encapsulated in zeolite is of significant importance due to many important redox information it offers.The paper focuses on the employment of dicyanobenzene(DCB) mute and in-situ synthesize to encapsulate metal phthalocyanine in the supercages of zeolite Y. The prepared CoPcY was characterized by various physicochemical methods of UV-Vis, FTIR and XRD to confirm the encapsulation, and by cyclic voltammetry to show its redox property after zeolite-modified electrodes were prepared. It would provide a theoretical basis for the encapsulation of metal complexation in zeolite.The paper consists of four parts:In the first part, zeolite CoY prepared with ion-exchange method have been characterized to find the ion-exchange ratio and appropriate experimental conditions. It will be helpful to the in-situ synthesis of MPc in supercages in the next step.In part two, with different raw materials and synthesis methods, cobalt-phthalocyanine macrocyclic complex were encapsulated in the supercages of zeolite Y. The influence of raw materials ratio and reaction conditions to the product yield and property was studied. To confirm the encapsulation several ways were taken such as XREh FTIR,UV-Vis.In part three, CoPcY modified electrodes were prepared, and the optimum preparation of electrodes and experiment conditions were obtained. For the characterization, the cyclic voltammetric method was selected. It showed that MPc's electrochemical activity was not much affected after encapsulation.In the end, the prepared CoPcY complex catalyst was used to catalyze the oxidation of cyclohexane and the reduction of molecular O₂, meanwhile their catalytic activity were studied. The results were that CoPc encapsulated in zeolite Y had the same activity with pure CoPc, and through encapsulation heterogenized homogeneous catalysis was achieved, the problem of separating product and catalyst was solved as well.