超极化 129Xe 核磁共振技术及其在多孔催化材料研究中的应用

 激光抽运和自旋交换的超极化 129Xe 核磁共振是近几年发展起来的一种新方法,它比普通 129Xe 核磁共振的检测灵敏度提高约104 ～105倍,是研究材料孔结构和孔内粒子分布的强有力工具. 本文介绍了超极化 129Xe 核磁共振技术并综述了其在多孔催化材料研究中的应用,特别是对催化反应中广泛使用的无机微孔和介孔材料中的应用进行了详细的讨论. 最后展望了此技术的应用前景.

Hyperpolarized 129Xe NMR and Its Applications in Characterization of Porous Catalytic Materials

Large spin polarization can be produced in 129Xe nuclei by laser optical pumping and spin exchange.Hyperpolarized Xe nuclear magnetic resonance(NMR)can increase the measurement sensitivity by several orders of magnitude compared to the thermally polarized Xe NMR.It is a powerful tool for studying the pore structure of a material and the particle distribution inside the pores.This paper introduced the basic principles of hyperpolarized 129Xe NMR and reviewed its applications in the characterization of porous catalytic materials,especially with respect to the inorganic microporous and mesoporous materials.The prospect of this technique was also discussed.