Morphology control of zeolite crystals by organic ligands

沸石是一种晶态多孔材料。多孔结构已经被用于它们的各种应用。沸石晶体的形貌控制对于这种孔结构的利用是非常重要的。本研究考察了有机配体与反应物形成络合物对L沸石和Silicalite-1晶体形态的影响。尽管L沸石容易形成棒状，但有机配体的加入为盘状晶体的形成提供了条件。由于盘状晶体在表面上有许多通道入口，因此它们可用作催化剂，并用作形成取向膜和膜的种子晶体。类似地，也合成了大尺寸的Silicalite-1晶体。这种大晶体对基础研究很有用，例如在分子水平上分析孔内吸附分子的状态和表面结构。

Zeolites are crystalline porous materials. The porous structures have been utilized for their various applications. Morphology control of zeolite crystals is important for such utilization of the porous structures. In this study, the influence of complex formations between organic ligands and reactants on crystal morphology was examined for L-type zeolite and silicalite-1. Despite the fact that L-type zeolite is prone to have a rod-like shape, the addition of organic ligands provided the formation of disc-like crystals. Since the disc-like crystals have many channel entrances on the surface, they are useful for catalysts and as the seed crystals for the formation of oriented films and membranes. Similarly, large silicalite-1 crystals were also synthesized. The large crystals are useful for fundamental studies, such as analyses of the state of adsorbed molecules in the pores and of the surface structure on the molecular level.