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.