Structural studies of hydrated germanium X-type zeolite via Rietveld analysis of synchrotron powder X-ray diffraction data

Geoffrey M. Johnson, Yongjae Lee, Akhilesh Tripathi, John B. Parise

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17 Citations (Scopus)

Abstract

An aluminogermanate analog of zeolite X has been synthesized by solution reaction, and characterized by Rietveld analysis of synchrotron powder X-ray diffraction data. The hydrated sample has a chemical formula Na96Al96Ge96O384·wH 2O, and the material possesses an ordered arrangement of Al and Ge in the framework. A cell parameter of 25.589(1)Å confirms the expected cell expansion over Low Silica X (LSX), although a smaller average framework T-O-T bond angle indicates greater relative cell collapse than for LSX. The distribution of sodium cations in the non-framework sites in NaGeX is significantly different from that in LSX, and appears to deviate from the proposed relationship between Al content and cation siting for hydrated aluminosilicate faujasite-type zeolites.

Original languageEnglish
Pages (from-to)195-204
Number of pages10
JournalMicroporous and Mesoporous Materials
Volume31
Issue number1-2
DOIs
Publication statusPublished - 1999 Oct

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation grant DMR-9713375. We thank David E. Cox for his help with data collection at X7A, which is supported by a grant from the US-DOE Division of Chemistry and Materials Sciences. We are also grateful to Dr. David R. Corbin and the Dupont Company for the ICP analysis.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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