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Silica Nanopowder Supported Frustrated Lewis Pairs for CO~2~ Capture and Conversion to Formic Acid by Kgauhelo Mentoor; Linette Twigge; J. W. Hans Niemantsverdriet; Jannie C. Swarts; Elizabeth Erasmus is a Chemistry article available to read on EtoBox.

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Treatment of hydroxylated silica nanopowders S1 and allyl-functionalized silica nanopowders S2 with 3-(diphenylborano)-or 3bis(pentafluorophenylborano)propyltrimethoxysilane or 2-(diphenylphosphino)-or 2-(dicyclohexylphosphino)ethyltriethoxysilane generates silica nanopowder supported Lewis acids S3 and silica nanopowder supported Lewis bases S4. These surfaces were characterized by 13 C, 11 B, and 31 P cross-polarization magic angle spinning nuclear magnetic resonance (CP MAS NMR), X-ray photoelectron spectroscopy (XPS), and attenuated total reflection Fourier transform infrared (ATR FTIR). When S3 is combined with solution-phase Lewis bases PR 3 (R = C 6 F 5 , C 6 H 5 , mesityl), six associated silica nanopowder supported frustrated Lewis pairs (FLPs) are formed. In another set of six reactions, the interactions between the supported Lewis bases S4 and solutionphase Lewis acids BR 3 with R = C 6 F 5 , C 6 H 5 , mesityl produced six more associated supported FLPs. The capture of CO 2 by these FLPs producing FLP-CO 2 Lewis pair adducts S5 and S6 were highlighted by ATR FTIR, and it was found that FLP S5e with R = C 6 H 5 on both the supported Lewis acid and solution-phase Lewis bas

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Author

Kgauhelo Mentoor; Linette Twigge; J. W. Hans Niemantsverdriet; Jannie C. Swarts; Elizabeth Erasmus

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)