Template extraction from surface-functionalised zeolite β nanoparticles

Abstract

Colloidal suspensions of functionalised zeolite nanoparticles have been prepared by a two-step procedure. Organic ligands were grafted to the surface of the zeolite nanoparticles, playing the role of functionalising groups as well as protective groups against framework alteration during subsequent solvent extraction of the structure directing agent (SDA). The effect of each step of the preparation procedure on particle size, morphology, crystallinity and the microporous properties of the material was studied by XRD, DLS, SEM and N₂ adsorption measurements. Nanoparticle surface bonding has been investigated by ²⁹Si and ³¹P MAS NMR. The accessibility and stability of the anchored functional groups on the final materials has been proved by fluorescence spectroscopy. This preparation procedure allows the size, morphology and crystallinity of the initial zeolite nanoparticles to be preserved, while opening the microporosity and modifying their surface reactivity.