Proton magic-angle-spinning NMR studies of the adsorption of alcohols on molecular sieve catalysts
Proton magic-angle-spinning NMR studies of the adsorption of alcohols on molecular sieve catalysts
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分子筛催化剂上醇吸附的质子魔角自旋核磁共振研究
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
J. Klinowski
中科院分区：
文献类型：
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作者：
Michael W Anderson;P. Barrie;J. Klinowski
{sup 1}利用hmas NMR研究了甲醇吸附在H- zsm -5分子筛和几种Si、Al、p基分子筛上的化学性质。甲醇形成CH{sub 3}OH{sub 2}{sup +}甲氧基铵离子，在晶内形成氢键。作者认为，与每个brensted酸位点相关的带电荷的甲醇分子簇以高覆盖率存在；在低覆盖率情况下，每个甲醇分子在一个布朗斯特酸位点结合。在Na-ZSM-5分子筛中，甲醇被配位吸附在阳离子上。
{sup 1}H MAS NMR has been used to study the chemistry of methanol adsorbed on zeolite H-ZSM-5 and several Si,Al- and Si,Al,P-based molecular sieves. Methanol forms the CH{sub 3}OH{sub 2}{sup +} methoxonium ion and is hydrogen-bonded in the intracrystalline space. The authors suggest that charged clusters of methanol molecules associated with each Broensted acid site are present at high coverages; at low coverages each methanol molecule is bound at a Broensted acid site. In zeolite Na-ZSM-5 methanol is coordinatively adsorbed on the cation.