Fig. 1: Morphological and structural changes with varying temperatures and atmospheres.
From: Redox dynamics and surface structures of an active palladium catalyst during methane oxidation
TEM image, SAED patterns and HRTEM image of Pd NPs recorded after in situ calcination at 300 °C in 20% O2 for 10 h (a–c). In situ observation of redox dynamics during increasing temperature from 350 to 800 °C (p(CH4) = 39.5 mbar, p(O2) = 8.8 mbar, and p(He) = 131.7 mbar) (d–g). In situ observations of particle fragmentation during temperature decrease from 800 to 550 °C (p(CH4) = 38.6 mbar, p(O2) = 12.9 mbar, and p(He) = 128.5 mbar) (h–k) and during the addition of CH4 into the O2/He flow (p(CH4) = 39.5 mbar, p(O2) = 8.8 mbar) (l–o). Electron dose rates for (d–g), (h–k), and (l–o) were about 460, 1110, and 710 e·nm−2 s−1, respectively.
