Preparation of Zeogrids through interposed stapling and fusion of MFI zeolite type nanoslabs

摘要

Ordered porous materials, called Zeogrids, are obtained by aggregation of Silicalite-1 nanoslabs upon addition of a secondary template (cetyltrimethylamnionium bromide), followed by calcination. The synthesis leads to a lamellar arrangement and fusion of the slabs and a high pore volume, distributed over ultra-micropores (0.14 mL/g) and super-micropores (0.55 mL/g). The use of a secondary template with shorter alkyl chain (dodecyltrimethylammonium bromide) leads to a similar structure, but results in a lower super-microporosity (0.33 mL/g). The interaction of the secondary template with the nanoslabs and their subsequent aggregation were monitored by DLS. The materials were characterized using SEM, XRD, TGA, N_2 adsorption and tracer gas chromatography.