水热法合成超大孔径（ULP）沸石分子筛

Hydrothermally Synthesis of OrderedUltra-large Pore Molecular Sieves

采用沸石分子筛来组装半导体纳米粒子为获得量子限域体系提供了一新的途径。

Abstract Semiconductor nanoparticle assembled within a zeolite is an example to create quantum confined systems. The present studies are focused on the hydrothermally synthesis of utra-large pore (ULP) molecular sieves. Molecular sieves can be prepared under hydrothermal condition from Catapal alumina aluminosilicate, silicate and ethylsilicate gels respectively, under carefully chosen conditions of pH, temperature and crystallization time. It is very important to note that co-added alkali metal cations, quaternary alkylammonium cation and surfactant species function as charge balancing agent, spacing-filling and structure-directing to obtain a ULP molecular sieve. TEM and electron diffraction pattern conform the periodicity of the structure. X-ray diffraction pattern of the powder sample shows that there are two peaks in the low-angle 2θ, a larger d value is 47. 4A. The formation of these materials take place by means of a liquid-crystal templating mechanism is also discussed.