Characterization of aluminum and boron containing beta zeolites prepared by solid-state recrystallization of magadiite

R. M. Mihályi, Borbély G. Páł, H. K. Beyer, A. Szegedi, T. I. Korányi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A method for the preparation of phase-pure [Al]-BEA and [Al,B]-BEA zeolites based on solid-state recrystallization of synthetic aluminum-containing magadiites is presented. For comparison [B]-BEA was prepared by conventional hydrothermal synthesis. From X-ray diffraction (XRD) measurements conclusions could be drawn in respect to kinetics and mechanism of the recrystallization process. Coordination state and resistance to hydrolysis of framework boron species in as-synthesized and ion-exchanged BEA varieties were investigated by 11B MAS NMR spectroscopy. The acidity of the samples was studied by temperature-programmed ammonia elimination (TPAE) from the NH4-forms and by IR spectroscopy using pyridine as probe molecule. An effect of framework boron on the acid strength of bridged hydroxyls associated with framework aluminum could not be evidenced. Nevertheless, incorporated boron gives rise to weak acid sites which are involved in ion-exchange processes. The number of strong Brønsted sites can be controlled by the aluminum content of the layer silicate.

Original languageEnglish
Pages (from-to)132-142
Number of pages11
JournalMicroporous and Mesoporous Materials
Volume98
Issue number1-3
DOIs
Publication statusPublished - Jan 5 2007

Fingerprint

Zeolites
Boron
Aluminum
zeolites
boron
solid state
aluminum
Silicates
acids
Acids
Hydrothermal synthesis
Ammonia
Acidity
acidity
Hydroxyl Radical
Pyridine
spectroscopy
Nuclear magnetic resonance spectroscopy
hydrolysis
ammonia

Keywords

  • [Al,B]-BEA-type zeolites
  • Acidity
  • Layer silicates
  • Solid-state recrystallization

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

Cite this

Characterization of aluminum and boron containing beta zeolites prepared by solid-state recrystallization of magadiite. / Mihályi, R. M.; Páł, Borbély G.; Beyer, H. K.; Szegedi, A.; Korányi, T. I.

In: Microporous and Mesoporous Materials, Vol. 98, No. 1-3, 05.01.2007, p. 132-142.

Research output: Contribution to journalArticle

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AU - Szegedi, A.

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