Dynamic In Situ NMR of Catalysis

催化的动态原位核磁共振

• 批准号: 0205939
• 负责人: James Haw
• 金额: $ 43.27万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-15 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205939&HistoricalAwards=false
• 关键词: Dynamic; Situ; NMR; Catalysis

The project of Professor James Haw of the University of Southern California, supported by the Analytical and Surface Chemistry Program, seeks to achieve a fundamental understanding of the catalytic reactions that occur on zeolites and solid acid catalysts. A special pulse quench catalytic reactor has been designed that allows the investigation of catalytic reactions by nuclear magnetic resonance spectrometry. Changes in chemical intermediates can be followed with this device with a time resolution of 0.2 s; reactions are quenched by rapid cooling or by the introduction of inhibiting reagents. Theoretical calculations are also used to model the experimental NMR results via calculated NMR chemical shifts and quadrupolar coupling constants. Two specific examples of catalytic systems to be studied in this project include the synthesis of pyridine and butene isomerization, both are processes which are catalyzed by zeolites. Nuclear magnetic resonance spectrometry is used to study the catalytic transformation of simple adsorbed gases into more complex molecules on zeolites and solid acids. Professor James Haw at the University of Southern California has developed a combination of chemical reaction system with quenching that allows complex catalytic systems to be studied. The new analytical method will be used to study the industrially important projects of pyridine synthesis and the isomerization of butene, a precursor to synthetic rubber.

南加州大学 James Haw 教授的项目得到了分析和表面化学项目的支持，旨在对沸石和固体酸催化剂上发生的催化反应有一个基本的了解。 设计了一种特殊的脉冲猝灭催化反应器，可以通过核磁共振波谱法研究催化反应。 该装置可以跟踪化学中间体的变化，时间分辨率为0.2秒；通过快速冷却或引入抑制试剂来猝灭反应。 理论计算还用于通过计算的 NMR 化学位移和四极耦合常数对实验 NMR 结果进行建模。 本项目要研究的催化系统的两​​个具体例子包括吡啶的合成和丁烯异构化，这两个过程都是由沸石催化的。 核磁共振波谱法用于研究简单吸附气体在沸石和固体酸上催化转化为更复杂的分子。 南加州大学的 James Haw 教授开发了一种化学反应系统与淬火的组合，可以研究复杂的催化系统。 新的分析方法将用于研究吡啶合成和合成橡胶前体丁烯异构化等工业重要项目。