固体核磁共振结合密度泛函理论计算研究SSZ-39分子筛的钠离子落位与铝分布
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Exploring the Na+ Locations and Al Distributions in SSZ-39 Zeolite by Solid-State NMR Spectroscopy and DFT Calculations
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图4. 不同硅铝比Na-SSZ-39分子筛的(a~c)一维23Na MAS NMR谱与(d~f)二维23Na MQ MAS NMR谱 |
Fig.4. (a~c) 1D 23Na MAS NMR and (d~f) 2D 23Na MQ MAS NMR spectra of Na-SSZ-39 zeolites with various Si/Al ratios |
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