The usage of zeolite mcm-41(2)
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The usage of zeolite mcm-41(2)
II. Field of material Development-Photoexcited Optical Materials sensitive to oxygen
This material is used for a new type of copper composite [Cu (POP) (PTI)] BF4, which is composed of copper compounds and inorganic porous molecular sieves-dissolving copper compounds in a specific solvent, then adding a certain amount of MCM-41 molecular sieves to form sol, stirring and filtering at room temperature, then washing with solvent three times and drying in air. The maximum wavelength of the composite is 500nm under UV lamp irradiation. Compared with the high price noble metal composites widely used at present, this photosensitive material has the advantages of low cost, simple fabrication, high sensitivity and low toxicity, so it is very suitable for oxygen detector.
III. the modification of their own characters.
Pure silicon MCM-41 and Al-MCM-41 were synthesized by hydrothermal synthesis. Pure silicon MCM-41 was modified by AlCl3 grafting method and boric acid immersion method. The carrier was characterized by XRD, N2 adsorption and NH3-TPD. The results showed that MCM-41 molecular sieves could be synthesized when the synthesis conditions of MCM-41 were very wide, pH 9.5 ≤ 10.5, crystallization time 1 ≤ 7 days, and the ratio of silicon to water was 60 ≤ 200. Pure silicon MCM-41 has typical hexagonal structure and high specific surface area. Al-MCM-41 obtained by grafting new groups to make the original material have new properties can maintain good regularity and high specific surface area, and obtain certain acidity at the same time. The crystallization of Al-MCM-41 synthesized by hydrothermal method is slightly worse, but the acid content is much higher than that of Al-MCM-41 modified by grafting with the same ratio of silicon and aluminum. MCM-41 supported precious metal catalysts were prepared by equal volume impregnation. The activity and sulfur resistance of the catalyst were investigated by using the hydrogenation of naphthalene as the model reaction and thiophene as the sulfur-containing compound. The results of TPR showed that different reduction species were formed on the calcined catalyst. For the modified Al-MCM-41, the interaction between the active components and the support increased with the decrease of the ratio of silicon to aluminum. The results of activity evaluation showed that the activity of Pd-Pt bimetallic components was higher than that of Pd and Pt monometallic under the same loading, and the activity order of catalysts on different supports was B-MCM-41 < pure silicon MCM-41.
