A study of the acidity of SAPO-34 by solid-state NMR spectroscopy
A study of the acidity of SAPO-34 by solid-state NMR spectroscopy
复制标题
固态核磁共振波谱研究 SAPO-34 的酸性
DOI：
10.1016/j.micromeso.2012.03.013
复制
发表时间：
2012-08-01
影响因子：
5.2
通讯作者：
Bao, Xinhe
中科院分区：
文献类型：
--
作者：
Shen, Wanling;Li, Xin;Bao, Xinhe
利用多核固体核磁共振结合探针分子技术，研究了不同硅含量的SAPO-34的酸性。结果表明，SAPO-34中存在两种B酸中心，其中一种B酸中心的酸强度高于ZSM-5。Si物种及其在骨架中的分布取决于Si含量。当Si含量较高时，形成大量的Si岛，当Si含量较低时，只存在孤立的Si（OAl）（4）物种。硅含量对SAPO-34的酸强度影响不大，但对酸浓度有影响。(C)2012 Elsevier Inc. All rights reserved.
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 Bronsted 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 Bronsted acid strength of SAPO-34, but does affect the acid concentration. (C) 2012 Elsevier Inc. All rights reserved.