SORPTION OF METHANOL ON ZEOLITE HBETA INVESTIGATED BY IN-SITU MAS NMR-SPECTROSCOPY

Citation
M. Hunger et T. Horvath, SORPTION OF METHANOL ON ZEOLITE HBETA INVESTIGATED BY IN-SITU MAS NMR-SPECTROSCOPY, Catalysis letters, 49(1-2), 1997, pp. 95-100
Citations number
25
Journal title
ISSN journal
1011372X
Volume
49
Issue
1-2
Year of publication
1997
Pages
95 - 100
Database
ISI
SICI code
1011-372X(1997)49:1-2<95:SOMOZH>2.0.ZU;2-F
Abstract
Methanol adsorption and desorption experiments were performed on acidi c zeolites applying a new in situ MAS NMR technique. H-1 MAS NMR spect ra of dehydrated zeolites were recorded during injection of nitrogen g as loaded with methanol into the MAS rotor. The spectra indicated that in zeolite HBeta also silanol groups are involved in the adsorption o f methanol which is in contrast to the behaviour of SiOH groups in zeo lites HZSM-5 and HY. The desorption experiments show that about 70% of the methanol molecules contributing to adsorbate complexes in zeolite HBeta are weakly hydrogen-bonded at silanol groups.