Journal
CHEMPHYSCHEM
Volume 19, Issue 19, Pages 2472-2479Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201800513
Keywords
ab initio calculations; Adsorption; NMR relaxation; Porous media; Surface analysis
Funding
- Catalysis@Cambridge initiative, University of Cambridge
- BP plc
- Wolfson College, Cambridge
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The ratio of NMR relaxation time constants T-1/T-2 provides a non-destructive indication of the relative surface affinities exhibited by adsorbates within liquid-saturated mesoporous catalysts. In the present work we provide supporting evidence for the existence of a quantitative relationship between such measurements and adsorption energetics. As a prototypical example with relevance to green chemical processes we examine and contrast the relaxation characteristics of primary alcohols and cyclohexane within an industrial silica catalyst support. T-1/T-2 values obtained at intermediate magnetic field strength are in good agreement with DFT adsorption energy calculations performed on single molecules interacting with an idealised silica surface. Our results demonstrate the remarkable ability of this metric to quantify surface affinities within systems of relevance to liquid-phase heterogeneous catalysis, and highlight NMR relaxation as a powerful method for the determination of adsorption phenomena within mesoporous solids.
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