Portal de Periódicos da CAPES

The theory and practice of hyperpolarization in magnetic resonance using parahydrogen

2012; Elsevier BV; Volume: 67; Linguagem: Inglês

10.1016/j.pnmrs.2012.03.001

1873-3301

Richard A. Green, Ralph W. Adams, Simon B. Duckett, Ryan E. Mewis, David C. Williamson, Gary Green,

Atomic and Subatomic Physics Research

Heterogeneous catalysis, one of the most important technologies in modern industry, primarily relies on inorganic solid catalysts and is typically complex in both the catalyst itself and the catalytic mechanism, unlike its homogeneous analog. The catalytic sites on solid catalysts often reside on surfaces and interfaces and lack long-range orders, posing challenges to detailed structure-reactivity elucidations. Solid-state NMR (ssNMR) is a well-known technique for characterizing catalytic sites in heterogeneous catalysis, as it provides a variety of approaches to probe the nature of catalytic sites including their atomic-level local structures, intrinsic reactivity, and site-site proximities, owing to its sensitivity to local electronic environments and internuclear interactions. Specifically, such features have been widely exploited to characterize bonding types, lengths, strengths, and geometry of catalytic site structures, etc., which are of general interest for the catalysis community. Further, NMR is also capable of providing valuable in-situ information with appropriate modifications to the instrument. In this chapter, we will discuss NMR fundamentals focusing on practical aspects (to avoid spin physics) and demonstrate how modern ssNMR techniques help in solving real catalytic problems with selected but intuitive examples, hoping to inspire more applications to unleash the power of NMR.