A study of the acidity of SAPO-34 by solid-state NMR spectroscopy

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• 作者：Wanling Shen^a ; Xin Li^a ; Yingxu Wei^b ; Peng Tian^b ; Feng Deng^c ; Xiuwen Han^a ; Xinhe Bao^a ; ^{xhbao@dicp.ac.cn}
• 关键词：SAPO-34 ; Solid-state NMR ; Acidity ; Probe molecule
• 刊名：Microporous and Mesoporous Materials
• 出版年：2012
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：1 August, 2012
• 卷：158
• 期：Complete
• 页码：19-25
• 文件大小：677 K

摘要

Using multinuclear solid-state NMR in combination with probe molecule techniques, we examined the acidic property of SAPO-34 with different Si content. The results show that there are two kinds of Br酶nsted acid sites in SAPO-34 with the acid strength of one kind higher than that of ZSM-5. The Si species and their distribution in the framework depend on the Si content. A large amount of Si islands are formed when Si content is high, at lower Si content, only isolated Si(OAl)₄ species exists. The Si content has little effects on the Br酶nsted acid strength of SAPO-34, but does affect the acid concentration.