The adsorption of methanol over various alkali metal exchanged zeolites (ZSM5, MOR, and FAU) was studied
by in situ IR spectroscopy and gravimetry. Lower Si/Al ratios (increasing the polarity of the zeolite lattice)
increased the interaction between methanol hydrogens, i.e., hydroxy as well as the methyl hydrogens, and the
lattice oxygen. Similarly, this interaction was strengthened as the atomic weight of the alkali metal cation
increased. This stronger hydrogen bonding did not lead to an overall higher heat of adsorption. This suggests
that the most important interaction occurs between the electron lone-pair donor function of methanol (i.e.,
the oxygen) and the electron pair acceptor function of the zeolite (i.e., the alkali metal cation). The methanol
adsorption complexes in the zeolite pores are discussed.
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