The dynamic behavior of Rh species in 1 wt% Rh/Al 2 O 3 catalyst during the three-way catalytic reaction was examined using a micro gas chromatograph, a NO x meter, a quadrupole mass spectrometer, and time-resolved quick X-ray absorption spectroscopy (XAS) measurements at a public beamline for XAS, BL01B1 at SPring-8, operando . The combined data suggest different surface rearrangement behavior, random reduction processes, and autocatalytic oxidation processes of Rh species when the gas is switched from a reductive to an oxidative atmosphere and vice versa. This study demonstrates an implementation of a powerful operando XAS system for heterogeneous catalytic reactions and its importance for understanding the dynamic behavior of active metal species of catalysts.
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Asakura et al. (2017) studied this question.
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