Preparation and Characterization of Mo-Hy Zeolites

A. Meszaros-Kis, J. Valyon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Mo-HY zeolites were prepared by reacting HY zeolites with tetrakis-pi-allylmolybdenum. The maximum molybdenum loading achieved was 1.3% by weight, i.e., 1.6 Mo atom per unit cell. IR spectroscopy was applied to study the surface reaction and the decomposition of the surface complex upon heating in H2 or O2. Upon contacting the zeolite and the pentane solution of the organometallic molybdenum compound, the intensity of the high-frequency OH-band at 3640 cm-1 decreases and band shifts to higher wavenumbers. The low-frequency OH-band remains practically unchanged. The entire organic surface complex is decomposed on treatment at 200°C. About 90% of the hydroxyl groups originally present in HY are recovered when the sample is heated to 400°C in H2. If the sample is heated in O2, about 50% of the protons in HY is replaced by Mo. At 400°C Mo-HY preparations preserve their crystallinity both in oxidized and reduced state.

Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume46
Issue numberC
DOIs
Publication statusPublished - 1989

Fingerprint

Zeolites
zeolites
Frequency bands
Molybdenum compounds
preparation
Surface reactions
Organometallics
molybdenum compounds
Molybdenum
Infrared spectroscopy
Protons
pentanes
Decomposition
Heating
Hydroxyl Radical
Atoms
surface reactions
molybdenum
crystallinity
low frequencies

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Catalysis
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

Preparation and Characterization of Mo-Hy Zeolites. / Meszaros-Kis, A.; Valyon, J.

In: Studies in Surface Science and Catalysis, Vol. 46, No. C, 1989, p. 251-258.

Research output: Contribution to journalArticle

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