Synthesis, Surface Modification And Catalytic Activity Of(Ti-Mn)and(Cr-Cco)-β Zeolite

Zeolite β is a high-silica zeolite with a three-dimensional large-pore system. This makes zeolite a candidate catalyst material because of its acid resistance and hydrothermal stability, was widely used in the petrochemical industry as catalyst or catalyst support. Much effort has been devoted to the synthesis of high efficiency catalytic zeolite β, in which there is a requirement for catalytic efficiency in various reaction systems; another, the research on the innovation of zeolite β preparation to pursue the reduced cost has received much attention from the sight of environment protection and energy conservation.Studies showed that the catalyst exhibited even better catalytic properties when transition metal ions were intronduced in zeolite β framework in alkylation 、 phenol hydroxylation and toluene disproportionation catalytic reaction, provide new techniques for industrial development; The maternal zeolite β with transition metal ions was modified in surface, which had lipophilic capability and hydrophilic, showed a good catalyst performance in the olefin phase interface reaction.Ti-Mn-β and Cr-Co-β were synthesized by using hydrothermal,and investigated their catalytic properties on phenol hydroxylation and styrene oxidation respectively. Besides CTAB was selected as reagent of surface modification, and study their catalytic properties in cycloexene hydration. The main contents discussed were as follows:(1)Synthesis, Characterization of Heteroatomic Ti-Mn-β Zeolite and Catalytic Performance on Phenol HydroxylationThe Ti-Mn-β zeolite was hydrothermally synthesized in a SiO2-TiO2-MnO2-(TEA)2O-H2O-NH4 F system. The structural characteristics of the products were determined by X-ray diffraction, infrared spectroscopy,UV-Vis diffuse reflectance spectroscopy, thermogravimetry-differential thermal analysis, scanning electron microscopy,X-Ray photoelectron spectroscopy, and the factors affecting the synthesis and catalytic performance of Ti-Mn-β zeolite were investigated. The results show that Ti-Mn-β zeolites have good catalytic activity in the hydroxylation of phenol.(2) Synthesis and Catalytic Performance for Styrene Oxidation of Heteroatomic Cr-Co-β ZeoliteThe Cr-Co-β zeolite was hydrothermally synthesized in a Si O2-Cr2O3-CoO-(TEA)2O-H2O-NH4 F system and the obtained products were characterized. Using 30% H2O2 as oxidant for reaction of styrene oxide to investigate the catalytic activily of Cr-Co-β zeolite And effects of solvents, molar ratio of metal and hydrogen peroxide to styrene, catalyst dosage, reaction time and temperature werealso explored.(3)Studies about the catalytic activity of amphiphilic zeolite β in phaseboundaryAmphiphilic zeolites(CTAB-Ti-Mn-β、CTAB-Cr-Co-β) were prepared by using CTAB to modified. XRD、IR and N2 adsorption-desorption istotherms were emplayed to characterize the samples, indicate that they still have a high degree of crystallinity. The zeolites show a good catalytic in cycloexene hydration because their distribution in water and reservoir.In conclusion, zeolite β has great developmental potential industrial application prospect as a new environmentally-friendly catalyst material.