An NMR Scale for Measuring the Base Strength of Solid Catalysts with Pyrrole Probe: A Combined Solid-State NMR Experiment and Theoretical Calculation Study

An NMR Scale for Measuring the Base Strength of Solid Catalysts with Pyrrole Probe: A Combined Solid-State NMR Experiment and Theoretical Calculation Study
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用吡咯探针测量固体催化剂基础强度的核磁共振标度:固态核磁共振实验和理论计算相结合的研究

DOI:
10.1021/acs.jpcc.6b11518
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发表时间:
2017-02
影响因子:
3.7
通讯作者:
Deng Feng
Deng Feng
中科院分区:
化学3区
文献类型:
--
作者:
Yi Xianfeng;Li Guangchao;Huang Ling;Chu Yueying;Liu Zhiqiang;Xia Hongqiang;Zheng Anmin;Deng Feng

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吡咯已被用作测定固体催化材料碱强度的核磁共振探针分子,但在以往的工作中,还缺乏吸附的吡咯的1H化学位移与固体催化剂的本征碱强度之间的定量关联。本文通过固体核磁共振实验和密度泛函理论(DFT)计算,研究了不同碱强度的分子筛上吡咯分子的吸附结构和1H化学位移。以一种通用的8T沸石((SiH3)3-Si-X-Si-O-(SiH3)3,X=O或NH)为基础,建立了不同的Si-H键长的计算模型来表示不同强度的碱性中心,并用于预测吡咯的吸附结构和1H化学位移。固体核磁共振实验结果表明,吸附的吡咯的1H化学位移越大,固体催化剂上的碱性中心越强。~1H化学成分S……之间的线性相关。
Pyrrole has been employed as an NMR probe molecule to determine the base strength of solid catalytic materials; however, the quantitative correlation between the 1H chemical shift of adsorbed pyrrole and the intrinsic base strength of solid catalysts is still lacking in the previous work. Here, solid-state NMR experiments and density functional theory (DFT) calculations were employed to explore the adsorption structures and 1H chemical shifts of adsorbed pyrrole molecules over the zeolites with varied base strengths. Based on a generic 8T zeolite ((SiH3)3-Si-X-Si-O-(SiH3)3, X = O or NH), various calculated models with different Si–H bond lengths were constructed to represent the basic sites with varied strengths and used to predict the pyrrole adsorption structures as well as the 1H chemical shifts. The solid-state NMR experimental results demonstrated that a larger 1H chemical shift of adsorbed pyrrole corresponds to a stronger basic site on solid catalysts. A linear correlation between the 1H chemical s...
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