Solvent-free synthesis of zeolite LTA monolith with hierarchically porous structure from metakaolin

摘要

We report a simple and effective process for preparing self-supporting zeolite LTA monoliths with hierarchical structure via the solvent-free crystallization route followed by a calcination process, using polymethyl methacrylate microbeads as sacrificial template. SEM images demonstrate the formation of interconnected macropores. Cube-shaped zeolite particles are intergrown at their interfaces, establishing a stable porous system. XRD results confirm the purity and crystallinity of zeolite LTA. BET and MIP results indicate three levels of pores (micro-, meso- and macrospores) present in the zeolite monolith. In addition, the BET surface area, bulk density, true density of the hierarchical zeolite are 57.67 m(2)/g, 0.684 g/cm(3) and 2.771 g/cm(3), respectively, and the total porosity is up to 75.3 vol%. (C) 2019 Elsevier B.V. All rights reserved.