Redox modification of high-silica zeolites with chromium via multistep cluster synthesis

Redox modification of high-silica zeolites with chromium via multistep cluster synthesis

This paper examines the modification of zeolites with superstoichiometric amounts of metals using multistep cluster synthesis. Ion-exchange sites in zeolite MFI-50 (SiO 2 /Al 2 O 3 molar ratio of 50) have been modified with hydrazonium cations. Subsequent redox reaction with chromate anions has yiel...

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Veröffentlicht in:Inorganic materials 2010-09, Vol.46 (9), p.978-982
Hauptverfasser: Vakhmistrov, V. E., Ponomaryov, A. B., Shostakovsky, M. V., Kalinin, V. N., Solodovnikov, S. P., Mortikov, E. S.
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum
Aluminum oxide
Chemistry
Chemistry and Materials Science
Chromates
Chromium
Chromium oxides
Clusters
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Synthesis
Zeolites
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Beschreibung
Zusammenfassung:This paper examines the modification of zeolites with superstoichiometric amounts of metals using multistep cluster synthesis. Ion-exchange sites in zeolite MFI-50 (SiO 2 /Al 2 O 3 molar ratio of 50) have been modified with hydrazonium cations. Subsequent redox reaction with chromate anions has yielded a chromium-containing zeolite. The sample prepared by three ion-exchange/redox cycles contains 10 wt % chromium (Cr-MFI-50). EPR results show that most of the chromium in Cr-MFI-50 is in the form of fine Cr 2 O 3 particles. In addition, the material contains isolated Cr 5+ ions and, presumably, Cr 3+ stabilized at aluminum vacancies.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168510090104