31P, 27Al, and 129Xe NMR study of phosphorus-impregnated HZSM-5 zeolite catalysts
31P, 27Al, and 129Xe NMR study of phosphorus-impregnated HZSM-5 zeolite catalysts
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DOI：
10.1016/0021-9517(90)90117-3
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发表时间：
1990-07
影响因子：
7.3
通讯作者：
G. Seo;R. Ryoo
中科院分区：
文献类型：
--
作者：
G. Seo;R. Ryoo
用~（31）P和~（27）Al魔角旋转核磁共振（magic angle spinning NMR）和~（129）NMR对磷浸渍的HZSM-5分子筛进行了表征。所有的NMR数据清楚地表明，磷化合物最初与骨架铝反应，改变了内部沸石表面的化学环境。正如129 NMR中的化学位移所表明的那样，磷的过量浸渍并没有进一步改变通道的物理化学环境。磷化合物与骨架铝的这种反应是沸石吸附和催化作用变化的原因。
Phosphorus-impregnated HZSM-5 zeolite has been characterized by31P and27Al magic angle spinning NMR and129Xe NMR spectroscopy. All the NMR data clearly indicate that the phosphorus compound reacts initially with the framework aluminum, modifying the chemical environment of the internal zeolite surface. Excessive impregnation of phosphorus did not change the physicochemical environment of the channel any further, as the chemical shift in129Xe NMR indicated. This reaction of the phosphorus compound with the framework aluminum is responsible for changes in the adsorption and catalysis of the zeolite.