The Preparation Of Supported Catalysts And Their Catalytic Performance With Photodeposition And Anchoring Method

Easy to recycle and improved availability of noble metals made the supported catalysts widely used in the field of catalysis. The structure, morphology, size and the interaction between metal and support of particles will lead a obvious regulating effect on the catalytic reaction and these characteristics are related to the different preparation methods. This paper discussed the application of Pd/TiO2 catalysts prepared with photodeposition (PD) and MTO/ZrPP with anchoring method respectively. And examines the preparation conditions on the influence of the structure and morphology of catalyst active species. We conclude the supported mechanism of the active metal species and apply the two systems to the catalysis of phenylacetylene hydrogenation and the epoxidation of cyclohexene. The research contents are as follows:Firstly, Pd/TiO2 were prepared by PD and DP, different structures were obtained and PD sample with more defects exhibit a higher selectivity in the hydrogenation of phenylacetylene. DFT results revealed that the growth mechanism of photodeoposition may be follow an external tile mode and there is a interaction between metal and support. The excellent performance of photodeposition can be due to a more-defect and thinner surface which may inhibit the formation of β-PdH. A good activity and lower selectivity were obtained in the DP sample with a larger and smooth particle.Then MTO/ZrPP were prepared by anchoring method and 100% selectivity with a high activity were obtained in the epoxidation of cyclohexene. DFT results revealed that MTO interact with ZrPP was through H-bond. The high selectivity benefit by the UHP with a helical channel and the high activity profit from the mobility of MTO on the support which make the reaction environment similar with homogeneous.