Adsorption and diffusion behavior of benzene in NaY zeolite are studied by using the frequency response method. The TG/DTG curves and Py FTIR technique are used to analyze the adsorption and diffusion mechanism of benzene on NaY. The results indicate that NaY zeolite contains two kinds of acidic centers, namely, the weak B acid and weak L acid sites. And L acid sites are in a dominant position. There are two adsorption interactions on NaY zeolite at 333 K and 423 K, the adsorption of low frequency through the π electronic interactions and high frequency of adsorption belong to pore filling. Adsorption is still the controlling stepat 573 K. However, diffusion is the controlling step on NaY at 623 K, indicating that weak adsorption results in easier desorption and easier diffusion of aromatic molecules on NaY, there by improving the performance of the hydro cracking reaction.

The Y/MCM41 composite molecular sieve was prepared by postsynthesis method and its performance was characterized by XRD, BET, N2 adsorptiondesorption and so on. In addition, its hydrothermal stability was studied. The results showed that the optimized synthesis conditions are as follows: pH 11,CTAB and SiO2 molar ratio of 0.15,crystallization time 48 h,and the composite molecular sieve had the properties of both mesoporous MCM41 and microporous Y. The acidity and hydrothermal stability of composite molecular sieve were better than that of pure mesoporous MCM41.

By using P123 as the sole template and under hydrothermal condition, the ZSM5/SBA15 composite molecular sieves were prepared by postsynthesis method. Catalyst was prepared by loading different ratio of ZrSO ₄ on the carrier and characterized by means of XRD、BET and N ₂ adsorptiondesorption. The results show that the composite molecular sieve exhibited the properties of both mesoporous SBA15 and microporous ZSM5, the introduction of appropriate amount of ZrSO ₄ may not change the structure of the composite molecular sieve, but the intensity of diffraction peaks decreased. The oxidative desulfurization of model oil (500 μg/g) was investigated by the proportion of Zr ion, reaction temperature, reaction time and so on. The desulfurization rate is 84.56% under the optimal conditions: 30 mL of oil, 0.08 g of tetrabutyl ammonium bromide as phase transfer catalyst, reaction temperature of 50 ℃, reaction time of 120 min, catalyst to oil ratio (mass ratio of the catalyst and model oil) of 1∶40 and the volumn ratio of hydrogen peroxide and oil of 0.02.