Titanium silicalite (TS-1)was successfully synthesized by using tetra-propylammonium bromide (TPABr) and n-butylamine as the template and the base, respectively. XRD, IR, SEM, 13C CP/MAS NMR, UV-VIS, and UV-Raman techniques were used to characterize the synthesized products. The results show that TS-1 has MFI structure with high crystallinity and large crystal size, and with two kinds of titanium species. Using epoxidation of propylene as the probe, the catalytic properties of TS-1 in the present work were investigated. The crystal size of TS-1 affects much the initial reaction rate of propylene oxide (PO) formation. The effects of reaction conditions on PO reveal that the PO formation is greatly influenced by the solvent and the solution pH value. Methanol is the most preferable solvent, and a portion of water (<30%) in solution does not have much impact on the reaction. Moreover, the addition of base used to neutralize the residual acidity of the catalyst favor the reaction, the catalyst shows high activity and selectivity upon the adequate amount of base and the catalyst can be used repeatedly without regeneration. In the fixed-bed reactor, using ammonium water as the neutralizer, after 200h of reaction, both the conversion and the utilization of H2O2 is about 95%, the selectivity of PO is about 90%.

The propylene epoxidation using supported titanium silicalite TS-1 catalyst was systematically investigated in a fixed bed reactor. Different supports such as SiO2 and Al2O3 were used and two molding methods were adopted to prepare the catalyst. Strip TS-1 catalyst of 1mm

The direct synthesis of para-diethylbenzene (PDEB) was achieved commercially via ethylation of ethylbenzene over EA catalysts (modified ZSM-5 zeolites). The preparations of EA catalysts by modifying micron-sized ZSM-5 zeolites and the performances of EA catalysts in industrial units are discussed. It is observed, that the PDEB selectivity of HZSM-5 can be enhanced by strengthening the channels' geometric constraints, decreasing the amount of strong acid sites and eliminating the external surface acid sites of H-type zeolites. And that with combined modifications, an all-sided adjustment of said parameters of HZSM-5 zeolites could be reached, which favors the preparation of commercial catalyst by allowing good activity and durability. Combined modifications also works well in elevating the PDEB selectivity ofnano-sized ZSM-5 zeolite, the promising candidate for a new generation ofpara-selective catalyst.

The synthesis of titanium silicalite by two methods (gas-solid isomorphous substitution of Ti4+ for Si4+ and hydrothermal crystallization synthesis), aiming at decreasing its cost, and the characterization of the prepared catalyst are presented. In the hydrothermal crystallization synthesis method of titanium silicalite-1 (TS-1), TPABr can be used to replace TPAOH and the amount of TPABr can be decreased to 0.05 (TPA+/SiO2). Organic amine cannot act as a template in the presence of TPA+. It can only regulate the basicity of the gel. The order of the template effect of different templates is as follows: TPA+>TBA+>TEA+>>organic amine. In the preparation of titanium-containing zeolite by secondary synthesis, the nature of the precursor and the preparation conditions have great influence on the incorporation of titanium into the framework. The mechanism of gas-solid isomorphous substitution is proposed, and under its guidance, we have successfully prepared Ti-ZSM-5, Ti-ZSM-11, Ti-β, and Ti-mordenite. The synthesized titanium-containing zeolites have been evaluated through catalytic hydroxylation of phenol, oxidation of styrene and epoxidation of propylene with aqueous H2O2. Results show that the Ti-containing zeolites possess high activity both in hydroxylation, styrene oxidation and in epoxidation.

taining 65% ethylene to produce diethylbenzene (DEB). Alkylation over the RE-Si-ZSM-5 catalysts yielded 95～98% P-DEB. The high para-setec-tivity is due to the reduction in acid strength within the pores and the reduction in acid sites on the crystal's external surface. These catalysts have good performance in the industrial application.

Nanocrystal (20nm) and microcrystal (10μm) ZSM-5 zeolites were synthesized by using the same gel composition. Results of characterization reveal that nanocrystal ZSM-5 with the morphology of polycrystalline grains has larger pore volume, higher adsorptioncapacity and larger surface area than microcrystal ZSM-5. High 2,2,3-trimethylbutane adsorption ability indicates the existence of secondary pores in nanocrystal grains. In nanocrvstal ZSM-5 zeolite the surface Si/Al ratio was close to the bulk Si/Al value. Catalytic action of nanocrystal HZSM-5 was studied for different reactions. In the alkylation of benzene with ethene, nanocrystal HZSM-5 displays higher activity and longer catalytic life than microcrystal HZSM-5, although higher amount of coke deposit is found on the former after reaction. In the ethylation of benzene (thiophene content 1000ppm) with ethylalcohol (95%) nanocrystal HZSM-5 demonstrats its high ability to resist sulfide poisoning. Catalytic alkylation of toluene with propene over HZSM-5 catalysts shows that nanocrystal zeolite exhibits high selectivity for alkylation.

通过调变晶化条件合成出一系列晶粒大小不同的沸石。对其H型沸石进行了苯-乙烯烷基化快速失活反应考察。应用微反色谱仪、脉冲吸附量测定等方法研究了沸石积炭模型及机理。结果表明，小晶粒团聚体沸石除在晶体内、外表面积炭外，同时在晶粒间空隙处积炭；堵孔作用是大晶粒沸石失活的重要原因。

The side-chain alkylation of toluene with methanol catalyzed by the modified binary zeolite catalysts of KX and Al2O3, KX, KY, KM, or KZSM-5 has been studied. It was found that the selectives of styrene increased with the partial charge on the (A104) tetrahedra in the second zeolite component. The KX/KZSM-5 binary zeolite catalysts had much higher activities than did the separate zeolite catalysts, and the catalytic properties were greatly improved after H3BO3 and KOH modifications. Comparing the alkylation data with the t.p.d, measurements of NH3 and C02, Sanderson's electronegativity, and the partial charge on the(A104) tetrahedra, it is concluded that the side-chain alkylation of toluene with methanol on the binary zeolite catalysts is an acid-base cooperative, selective reaction.