Fabrication of Hierarchical porous structures by using zeolite nanocrystals with Styrene Butadiene Rubber (SBR) and Natural Rubber (NR) latex as Macromolecular Templates

摘要

Zeolites are used in several industrial applications as catalysts, ion-exchangers and molecular sieves. The superior performance is related to the presence of well-defined micropores in the zeolite structure. However, in many cases the presence of micropores causes some limitations on their applicability. Recently, there has been a great deal of interest in the synthesis of hierarchical porous materials with zeolite structures. The introduction of mesopores or macropores into zeolites has been achieved using macrotemplates. Construction of zeolite materials with hierarchical porous structures can improve reaction efficiencies and minimize channel blocking. In this paper, we compare the fabrication of zeolite structures having three generations, micro-, meso-, and macro porosities using silicalite-1 nanocrystals with Styrene Butadiene Rubber (SBR) or Natural Rubber (NR) latex particles as macropore templates. The procedure is very simple, and requires short period. The method is general, which means that the conditions are applicable to the fabrication of hierarchical zeolite materials of all zeolite systems.