Post-synthesis stabilization of germanosilicate zeolites ITH, IWW, and UTL by substitution of Ge for Al

Mariya V. Shamzhy, Pavla Eliašová, Dana Vitvarová, Maksym V. Opanasenko, Daniel S. Firth, Russell E. Morris

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Abstract

Germanosilicate zeolites often suffer from low hydrothermal stability due to the high content of Ge. Herein, we investigated the post-synthesis introduction of Al accompanied by stabilization of selected germanosilicates by degermanation/alumination treatments. The influence of chemical composition and topology of parent germanosilicate zeolites (ITH, IWW, and UTL) on the post-synthesis incorporation of Al was studied. Alumination of ITH (Si/Ge=2–13) and IWW (Si/Ge=3–7) zeolites resulted in the partial substitution of Ge for Al (up to 80 %), which was enhanced with a decrease of Ge content in the parent zeolite. In contrast, in extra-large pore zeolite UTL (Si/Ge=4–6) the hydrolysis of the interlayer Ge−O bonds dominated over substitution. The stabilization of zeolite UTL was achieved using a novel two-step degermanation/alumination procedure by the partial post-synthesis substitution of Ge for Si followed by alumination. This new method of stabilization and incorporation of strong acid sites may extend the utilization of germanosilicate zeolites, which has been until now been limited.
Original languageEnglish
Pages (from-to)17377-17386
Number of pages10
JournalChemistry - A European Journal
Volume22
Issue number48
Early online date18 Oct 2016
DOIs
Publication statusPublished - 21 Nov 2016

Keywords

  • Alumination
  • ITH
  • IWW
  • UTL
  • Zeolites

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