No need to get away: X-ray absorption spectroscopy of catalytically active palladium nanopartlcles during a SuzukiMlyaura cross-coupling reaction revealed that the nanopartlcles were stable under the reaction conditions, and that cross-coupling Involved the direct participation of surface palladium defect sites In the catalytic cycle (see picture). Selective chemical and structural poisons provided further evidence for a heterogeneous active site.
Bibliographical noteWe thank the EPSRC (EP/E046754/1, EP/G007594/1), the ESRF (award CH2432), AstraZeneca, and the Royal Society for supporting this research, and Dr. S. Nikitenko for assistance on beamline BM26. XAS=X-ray absorption spectroscopy.
- C-C coupling
- EXAFS spectroscopy
- heterogeneous catalysis
- surface analysis