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含硼分子筛的11B VAS NMR和1H MAS NMR研究
引用本文:陈铁红,孙平川,邓风,王敬中,丁大同. 含硼分子筛的11B VAS NMR和1H MAS NMR研究[J]. 波谱学杂志, 2000, 17(2): 109-113
作者姓名:陈铁红  孙平川  邓风  王敬中  丁大同
作者单位:1.南开大学, 化学系, 高分子所, 物理系, 天津 300071;2.中国科学院武汉物理与数学研究所, 武汉 430071
基金项目:中国科学院资助项目;29803004;
摘    要:以变角旋转(VAS) NMR方法考察了三配位硼的存在状态,得到其四极作用常数Cq为2.4MHz,电场梯度不对称系数η为0.0.硼引入骨架形成的酸性羟基质子的信号位于2.3ppm,1H{11B}双共振实验证实其与硼原子的关联很弱.与6.5ppm分子筛吸水峰同时出现的2.7ppm的信号也被认为是吸水的信号,与非骨架铝羟基质子的信号在同一位置,但可通过1H{27Al}双共振实验加以判别.

关 键 词:变角旋转(VAS) NMR  硼硅羟基  双共振  
收稿时间:1999-12-13

11B VAS NMR AND 1H MAS NMR STUDY ON THE BORON-CONTAINING ZEOLITES
CHEN Tiehong,SUN Pingchuan,DENG Feng,WANG Jingzhong,DING Datong. 11B VAS NMR AND 1H MAS NMR STUDY ON THE BORON-CONTAINING ZEOLITES[J]. Chinese Journal of Magnetic Resonance, 2000, 17(2): 109-113
Authors:CHEN Tiehong  SUN Pingchuan  DENG Feng  WANG Jingzhong  DING Datong
Affiliation:1.Nankai University, Tianjin 300071;2.Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071
Abstract:The VAS (Variable Angle Spinning) NMR method was applied in the study on the Boron containing ZSM 12 and ZSM 5 zeolites. By the {} {11}B VAS NMR experiment and simulations of the powder patterns, the quadrupolar constant of the tri coordinated boron was determined to be 2.4MHz, and the electrical field gradient coefficient 0.0. The resonance of the Boron Silicon hydroxyl proton is at 2.3ppm, and by the {} 1H{ {11}B} spin echo double resonance it is shown that the 2.3ppm protons are very weakly coupled with the boron atoms. Besides the 6.5ppm adsorbed water peak, a 2.7ppm water adsorption peak was also found, whose position is the same with the extra framework Al hydroxyls. This kind of water adsorption signal can be distinguished by the {} 1H{ {27}Al} spin echo double resonance experiment. ;
Keywords:VAS NMR   Boron Silicon Hydroxyl   Double resonance
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