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
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.