Adsorption complexes of methanol on zeolite ZSM-5

Adsorption complexes of methanol on zeolite ZSM-5
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ZSM-5沸石上甲醇的吸附配合物

DOI:
10.1039/ft9908603039
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发表时间:
1990
期刊:
Journal of the Chemical Society, Faraday Transactions
影响因子:
--
通讯作者:
J. Klinowski
J. Klinowski
中科院分区:
--
文献类型:
--
作者:
G. Mirth;J. Lercher;Michael W Anderson;J. Klinowski

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本文用红外光谱、核磁共振氢谱和热重分析研究了甲醇在H-ZSM-5、Na-ZSM-5和K-ZSM-5分子筛上的吸附化学。在H-ZSM-5上,甲醇在低覆盖度下形成CH 3OH +2甲氧基鎓离子。在较高的覆盖率,大质子化集群的强氢键分子与布朗斯台德酸网站。在Na-ZSM-5和K-ZSM-5分子筛中,甲醇配位吸附在阳离子上,在较高的平衡压力下形成弱氢键簇。
Infrared spectroscopy, 1H MAS NMR and thermogravimetric analysis have been used to study the chemistry of methanol adsorbed on zeolites H-ZSM-5, Na-ZSM-5 and K-ZSM-5. On H-ZSM-5, methanol forms the CH3OH+2 methoxonium ion at low coverages. At higher coverages, large protonated clusters of strongly hydrogen-bonded molecules associated with the Bronsted-acid sites are present. In zeolites Na-ZSM-5 and K-ZSM-5 methanol is coordinatively adsorbed on the cation and forms weakly hydrogen-bonded clusters at higher equilibrium pressures.