The Si-Ge substitutional series in the chiral STW Zeolite Structure Type

TL;DR

This study comprehensively synthesizes and analyzes the entire Ge-Si compositional series in the STW zeolite, combining experimental data with theoretical calculations to understand structural, energetic, and spectroscopic properties.

Contribution

It provides new insights into the Ge-Si substitution in STW zeolite, including a detailed assignment of fluoride NMR resonances and the relationship between composition and structural stability.

Findings

Zeolite yield peaks at intermediate Ge content

Unit cell expands with Ge content, with resistance at high silica end

New assignment of fluoride NMR resonances based on Ge environment

Abstract

The whole compositional range (Ge$_f$ = Ge/(Ge+Si)= 0 to 1) of zeolite STW has been synthesized and studied by a comprehensive combined experimental--theoretical approach. The yield of zeolite goes through a maximum and then drops at the GeO$_2$ side of the series, following the inverse of the calculated free energy curve. The unit cell generally expands, roughly linearly, as the Ge$_f$ increases, but a notable resilience to expansion is observed at the high silica side. This can be attributed to the more rigid character of SiO$_2$ and the ability of Ge units to deform. Density functional theory calculations provide a new assignment of the previously controversial $^{19}$F MAS NMR resonances for occluded fluoride, which is based not only in the number of Ge atoms in the double-4-ring units but also on the way they are associated (namely, no Ge, isolated Ge, Ge pairs or closed Ge clusters). While we found an overall good agreement between the experimental and theoretical trends in preferential occupation by Ge of different crystallographic sites, the theoretical models show more sharp and abrupt tendencies, likely due both to limitations of the approach and to kinetic factors that allow metastable configurations to actually exist.