Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study

M. Rep; A. E. Palomares; G. Eder-Mirth; J. G. Van Ommen; N. Rösch; J. A. Lercher

doi:10.1021/jp0001945

Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study

M. Rep, A. E. Palomares, G. Eder-Mirth, J. G. Van Ommen, N. Rösch, J. A. Lercher

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Abstract

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.

Original language	English
Pages (from-to)	8624-8630
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	104
Issue number	35
DOIs	https://doi.org/10.1021/jp0001945
State	Published - 7 Sep 2000

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title = "Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study",

abstract = "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.",

author = "M. Rep and Palomares, {A. E.} and G. Eder-Mirth and {Van Ommen}, {J. G.} and N. R{\"o}sch and Lercher, {J. A.}",

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doi = "10.1021/jp0001945",

language = "English",

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T1 - Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study

AU - Rep, M.

AU - Palomares, A. E.

AU - Eder-Mirth, G.

AU - Van Ommen, J. G.

AU - Rösch, N.

AU - Lercher, J. A.

PY - 2000/9/7

Y1 - 2000/9/7

N2 - 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.

AB - 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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DO - 10.1021/jp0001945

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JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

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ER -

Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study

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