Siliceous extra-framework species in dealuminated Y zeolites generated by steaming

Research output: Contribution to journal › Article › Research › peer review

Authors

  • W. Lutz
  • H. Toufar
  • D. Heidemann
  • N. Salman
  • C. H. Rüscher
  • T. M. Gesing
  • J. Chr Buhl
  • R. Bertram

Research Organisations

External Research Organisations

  • Tricat Zeolites GmbH
  • Humboldt-Universität zu Berlin (HU Berlin)
  • Leibniz Institute for Crystal Growth (IKZ)
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Details

Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume104
Issue number1-3
Early online date26 Jan 2007
Publication statusPublished - 23 Aug 2007

Abstract

The dealumination of NH4Y zeolite by steaming at 873 K and 1 bar water pressure is accompanied by a partial decomposition of the framework. X-ray amorphous aluminosilicate and silica gel are formed as extra-framework siliceous species in addition to the known polymeric aluminium ions. Source of the aluminosilicate and silica gel are Al-rich and Si-rich parts of the non-homogeneously crystallized FAU framework which are unstable during steaming. The Al-rich part consists of a Si/Al gradient as characterized by means of Molybdate experiments. The extra-framework siliceous species are identified by 29Si MAS NMR spectroscopic measurements as extra Si(4Al) and Si(0Al) signals which appear separated from the corresponding signal distribution of the zeolite framework. A certain portion of this silica gel superimposes, however, the Si(0Al) and Si(1Al) signal distribution of the zeolite framework. This "non-visible" part is quantified by the calculation of Si/Al ratio obtained by 29Si MAS NMR spectroscopy with respect to results obtained using the characteristic lattice parameter values.

Keywords

    Dealumination, Siliceous extra-framework species, Steaming, Zeolites

ASJC Scopus subject areas

Cite this

Siliceous extra-framework species in dealuminated Y zeolites generated by steaming. / Lutz, W.; Toufar, H.; Heidemann, D. et al.
In: Microporous and Mesoporous Materials, Vol. 104, No. 1-3, 23.08.2007, p. 171-178.

Research output: Contribution to journal › Article › Research › peer review

Lutz, W, Toufar, H, Heidemann, D, Salman, N, Rüscher, CH, Gesing, TM, Buhl, JC & Bertram, R 2007, 'Siliceous extra-framework species in dealuminated Y zeolites generated by steaming', Microporous and Mesoporous Materials, vol. 104, no. 1-3, pp. 171-178. https://doi.org/10.1016/j.micromeso.2007.01.028
Lutz, W., Toufar, H., Heidemann, D., Salman, N., Rüscher, C. H., Gesing, T. M., Buhl, J. C., & Bertram, R. (2007). Siliceous extra-framework species in dealuminated Y zeolites generated by steaming. Microporous and Mesoporous Materials, 104(1-3), 171-178. https://doi.org/10.1016/j.micromeso.2007.01.028
Lutz W, Toufar H, Heidemann D, Salman N, Rüscher CH, Gesing TM et al. Siliceous extra-framework species in dealuminated Y zeolites generated by steaming. Microporous and Mesoporous Materials. 2007 Aug 23;104(1-3):171-178. Epub 2007 Jan 26. doi: 10.1016/j.micromeso.2007.01.028
Lutz, W. ; Toufar, H. ; Heidemann, D. et al. / Siliceous extra-framework species in dealuminated Y zeolites generated by steaming. In: Microporous and Mesoporous Materials. 2007 ; Vol. 104, No. 1-3. pp. 171-178.
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