Synthesis of ITQ-7 with a new template molecule and its crystal structure analysis in the as synthesized form

Abstract

Using a new template, 1,3,3-trimethylspiro[6-azoniabicyclo[3.2.1]]octane-6,1′-piperidinium fluoride, an efficient synthesis of the 12 membered ring zeolite ITQ-7 has been discovered. The zeolite has been characterized using DTA, TG, and solid-state NMR spectroscopy. In order to elucidate the host–guest interaction, the crystal structure analysis of the as synthesized form has been carried out using a Rietveld refinement of X-ray powder diffraction data. The influence of the cotemplate F – on the silicate condensation was studied with 19F MAS NMR, observing the sample during the synthesis procedure. The analyses show clearly the unspecified templating role of the organic structure directing agent for the ITQ-7 pore system and the interaction of the F –-ion with double-4-ring silicate species in the early process of the formation of the silica framework. To cite this article: J.Q. Song et al., C. R. Chimie 8 (2005).