Typical characterization strategies similar to transmission electron microscopy (TEM) can not visualize the refined structural adjustments in Rh nanoparticles in the course of the discount of NO to N2 on their floor. Therefore, on this research, we used an environmental response science high-voltage electron microscope outfitted with a quadrupole mass spectrometer (QMS) system to conduct operando atomic-scale evaluation of the NO discount course of on Rh nanoparticles supported on ZrO2. This modern setup enabled us to look at dynamic floor structural adjustments whereas concurrently monitoring the manufacturing of N2 and consumption of NO underneath related response situations. Excessive-resolution TEM observations and kinetic calculations primarily based on QMS information confirmed the presence of a pseudocyclic transitional state between Rh metallic and RhO2 inside an unstable oxide monolayer on the floor of the Rh nanoparticles, which is a hitherto undocumented phenomenon. A comparability of experimental information with the corresponding simulated pictures revealed believable catalytic mechanisms for the discount of NO to N2 at three completely different temperature ranges (200–500, 500–600, and 600–700 °C). At low temperatures, the response primarily happens on a skinny RhO2 movie fashioned on the nanoparticle floor, which defies the longstanding consensus that the discount of NO happens on Rh metallic websites. Our methodology enabled the direct statement of transient floor states and revealed their capacity to dictate the general response dynamics. The findings of this research present insights into floor catalytic reactions on nanoparticles underneath sensible situations in addition to can information future research on catalytic mechanisms.
