Preparation Of Metal/UIO-66 Supported Catalyst And Catalytic Oxidation Of Toluene

As we all know,with the rapid development of urbanization and industrialization,the emissions of volatile organic compounds(VOCs)increase.At the same time,the many kinds of pollution have caused serious impact on human and the environment.Catalytic oxidation technology is widely used in practical production because of its many advantages in VOCs removal.The commonly used catalysts can be divided into supported noble metal catalysts(SNMCs)and supported transition metal oxides(TMOs)according to active components.Research and development of a carrier with a larger specific surface area,stronger adsorption performance,and greatly improved catalytic activity can greatly enhance the catalytic oxidation ability of VOCs.Because the large specific surface area and strong adsorption performance of catalyst support can greatly enhance the catalytic activity of catalyst,the development of new catalyst support is one of the current research hotspots.Metal organic framework(MOFs)is a new material with large specific surface area,strong adsorption capacity,ordered and adjustable pore structure,rich metal active sites and easy exposure.The properties of MOFs treated at different temperatures change obviously,so MOFs has potential catalytic properties.In this paper,In this paper,MOFs was used as the carrier of SNMCs and TMOs to study their synthesis and characterization.And as the object of study,it was used in toluene catalytic oxidation experiment to research of the catalytic oxidation of toluene.The main contents and results are as follows:(1)The supported noble metal catalyst(Pd@UIO-66)was prepared by double solvent method.The morphology,structure and dispersion of Pd@UIO-66 were characterized by X-ray diffraction and transmission electron microscopy.The valence and content of Pdo were analyzed by X-ray photoelectron spectroscopy.After comparing the catalytic activity of toluene at low temperature,the optimal loading of PD was determined to be 0.2wt%.Its performance test shows that the material has good catalytic performance at T90?210?.The results of X-ray diffraction and Fourier infrared spectroscopy show that the structure of the catalyst did not change before and after the water resistance test,and the catalytic activity could return to normal,which indicated that the material had good resistance and stability.(2)MnOx@UIO-66 was prepared by two solvent method in this paper.The supported transition metal oxides with quasi-MOFs structure was formed by heat treatment.The structure and morphology of the sample were characterized by X-ray diffraction,scanning electron microscopy and Fourier infrared spectroscopy.X-ray diffraction photoelectron spectroscopy and temperature programmed reduction were used to compare the valence state of manganese species,the strength of interaction between carrier and active components,and the redox ability.According to the analysis of performance test results,T90 of material=256?.The stability of quasi MOFs structure and the durability of the material show that the material has good catalytic performance,excellent stability and resistance.