Fig. 4 | Nature Communications

Fig. 4

From: Stable complete methane oxidation over palladium based zeolite catalysts

Fig. 4

Transient operando EXAFS experiment with oxygen cut-off. a, b Fraction of oxidized palladium in Pd/Na-MOR and Pd/H-MOR and corresponding catalytic activity in 1 vol% CH4, 4 vol% O2, 5 vol% H2O, bal. N2, GHSV = 350,000 h−1 at 350 °C. Oxygen was removed from the feed to perform reduction of palladium by methane and then added for subsequent reoxidation in reaction conditions. c, d Fourier transforms of in situ Pd K-edge EXAFS spectra (non-phase shift corrected) of Pd/Na-MOR and Pd/H-MOR upon averaging 15 spectra at 1, 90, 210, 280, and 550 s of the experiment. Corresponding coordination numbers are given in Table 2. Initial rates were obtained from fitting the linear function over the first 10 points during reoxidation. e, f, g STEM images of the quenched Pd/H-MOR at 1, 210, and 280 s. Scale bar: 20 nm

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