Abstract
Palladium nanostructures are interesting heterogeneous catalysts because of their high catalytic activity in a vast range of highly relevant reactions such as cross couplings, dehalogenations, and nitro-to-amine reductions. In the latter case, the catalyst Pd@GW (palladium on glass wool) shows exceptional performance and durability in reducing nitrobenzene to aniline under ambient conditions in aqueous solutions. To enhance our understanding, we use a combination of optical and electron microscopy, in-flow single molecule fluorescence, and bench chemistry combined with a fluorogenic system to develop an intimate understanding of Pd@GW in nitro-to-amine reductions. We fully characterize our catalyst in situ using advanced microscopy techniques, providing deep insights into its catalytic performance. We also explore Pd cluster migration on the surface of the support under flow conditions, providing insights into the mechanism of catalysis. We show that even under flow, Pd migration from anchoring sites seems to be minimal over 4 h, with the catalyst stability assisted by APTES anchoring.
Article note:
A collection of invited papers based on presentations at the 28th IUPAC Symposium on Photochemistry (PhotoIUPAC 2022) held in Amsterdam, 17–22 July 2022.
Based in part on JCS presentation at the 28th IUPAC Symposium on Photochemistry (PhotoIUPAC 2022).
Funding source: Canada Research Chairs
Award Identifier / Grant number: CRC1
Funding source: Canada Foundation for Innovation
Award Identifier / Grant number: EF
Funding source: Natural Sciences and Engineering Research Council of Canada
Award Identifier / Grant number: Discovery
Acknowledgements
This work was supported by the Natural Sciences and Engineering Research Council, the Canada Foundation for Innovation and the Canada Research Chairs program.
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Research funding: This work was supported by Canada Research Chairs (CRC1) and Canada Foundation for Innovation (EF).
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