固体核磁共振技术在分子筛催化研究中的应用(下)

Application of solid-state NMR spectroscopy in research of molecular sieve catalysis

分子筛催化剂的活性与其酸性密切相关。固体核磁共振技术是研究分子筛结构和酸性的强有力手段之一。介绍了固体核磁共振的基本原理及魔角旋转、高功率质子去耦、交叉极化、多脉冲同核去耦以及四级核的信号增强等一系列相关操作技术,综述了固体核磁共振在表征分子筛催化剂骨架结构和形态方面的应用实例,以及在研究分子筛催化剂酸性及表面吸附分子方面的应用进展。

Molecular sieve catalysts have widely been used in petrochemical industry. Solid-state NMR techniques are one of the powerful characterization tools for the research of the structure and acidity of the molecule sieve catalysts. In this report, the fundamental theory and principles of the high resolution solid-state NMR techniques including magic angle spinning, high power proton decoupling, cross polarization and multiple-pulse homonuclear decoupling were described. The relevant applications of the solid-state NMR techniques in the characterization of the structure and morphology of the molecular sieve catalysts were introduced. The recent developments were reviewed through some examples for the characterization of the molecular sieve catalyst acidity and surface adsorption.