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Structure of natural and NH4 -exchanged Sasbach faujasite: a single-crystal study

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The interest for the environmental, industrial and technological applications of Si-rich zeolites is very high. Among the large-pore zeolites, faujasite is one of the most exploited. The aim of this paper is to obtain detailed structural information on natural and NH4 -exchanged faujasite before using this zeolite for dealumination tests, targeting the realization of large single crystals of allsilica faujasite. As one of the most Si-rich natural samples, faujasite from Sasbach (Na13.64 K0.87 Mg10.46 Ca8.89 Sr0.34 (Al51.95 Si139.57 ) O384 ·272.29 H2 O; space group Fd-3 m; a = 24.6906(2) Å) was chosen for study. Single-crystal X-ray diffraction structural refinements of both natural and NH4 -exchanged samples are reported and discussed. In the natural faujasite sample, almost all the extraframework species could be located for the first time. In the NH4 -exchanged sample the ammonium and water molecule sites were located. Ammonium cations occupy two of the sites occupied by the extraframework species in the original mineral.
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Keywords: CRYSTAL STRUCTURE; FAU; NATURAL FAUJASITE; NH4 -EXCHANGED FORM; SINGLE-CRYSTAL X-RAY DIFFRACTION; ZEOLITE

Document Type: Research Article

Publication date: June 1, 2018

This article was made available online on May 9, 2018 as a Fast Track article with title: "Structure of natural and NH4-exchanged Sasbach faujasite: a single-crystal study".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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