Recent development in in situ NMR study on heterogeneous catalysis: mechanisms of light alkane functionalisation

Abstract

In situ NMR studies of C(1)-C(5) light alkane activation and functionalisation in heterogeneous catalytic systems are overviewed. The results obtained from the NMR technique, particularly those quantitative ones, provide unique information on the activation of alkane molecules and the nature of relevant intermediates, leading to better understanding reaction mechanisms and designing catalysts.

Facet-dependent acidic and catalytic properties of sulfated titania solid superacids

“…Solid state NMR spectroscopy is a powerful tool for the measurement of solid acidity. 21,22 Compared with other commonly used solid acidity characterization techniques, such as temperature programmed desorption of ammonia and FT-IR spectroscopy of pyridine, solid state NMR has been shown to be sensitive and reliable in terms of providing abundant information on the acid type, acid strength, and strength distribution in various solid acids. TMP is a widely used probe molecule for detecting acid properties of solid acid catalysts.…”

“…21,22 Compared with other commonly used solid acidity characterization techniques, such as temperature programmed desorption of ammonia and FT-IR spectroscopy of pyridine, solid state NMR has been shown to be sensitive and reliable in terms of providing abundant information on the acid type, acid strength, and strength distribution in various solid acids. 21,22 Compared with other commonly used solid acidity characterization techniques, such as temperature programmed desorption of ammonia and FT-IR spectroscopy of pyridine, solid state NMR has been shown to be sensitive and reliable in terms of providing abundant information on the acid type, acid strength, and strength distribution in various solid acids.…”

Nuclear Magnetic Resonance Spectroscopy for In Situ Monitoring of Porous Materials Formation under Hydrothermal Conditions

“…NMR spectroscopy is ideally suited to the study of microporous materials since they contain numerous active NMR nuclei like 29 Si, 27 Al, 31 P, 19 F, 1 H, and 13 C in both framework and extra-framework parts. Multinuclear approach is capable of providing distinct information on local structures of organic/inorganic species, and their interaction, simultaneously [45,46,47]. In situ NMR has been progressively developed to investigate the real synthesis conditions of microporous solids, under hydrothermal conditions.…”

The primary stages of polyoxomolybdate catalyzed cyclohexanone oxidation by hydrogen peroxide as investigated by in situ NMR. Substrate activation and evolution of the working catalyst

“…In this respect, diverse experimental approaches for the investigation of the catalytic behavior of material under working conditions were developed, in particular, spectroscopic methods [35][36][37]. Among these techniques, NMR spectroscopy is considered to be one of the most informative, since it allows following the fate of both reactant and catalyst during the time course of the reaction [38][39][40]. Furthermore, it offers the possibility to obtain quantitative results on the transformations of the substrates and thus permits to study reaction kinetics in situ [41].…”