The Si-Ge substitutional series in the chiral STW Zeolite Structure Type
Abstract
The whole compositional range (Ge = 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 side of the series, following the inverse of the calculated free energy curve. The unit cell generally expands, roughly linearly, as the Ge 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 and the ability of Ge units to deform. Density functional theory calculations provide a new assignment of the previously controversial 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.
Cite
@article{arxiv.1807.01922,
title = {The Si-Ge substitutional series in the chiral STW Zeolite Structure Type},
author = {Reus Tiago Rigo and Salvador Rodríguez-Gómez Balestra and Said Hamad and Rocío Bueno-Pérez and Ángel Rabdel Ruíz-Salvador and Sofía Calero and Miguel A. Camblor},
journal= {arXiv preprint arXiv:1807.01922},
year = {2018}
}
Comments
26 pages