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。

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.

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