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Change and change again: Under catalytic conditions for NO/CO conversion, simultaneous time-resolved extended X-ray absorption fine structure spectroscopy and IR studies show that the rhodium atoms in 5 wt % Rh/Al2O3 rapidly migrate between CO-covered Rh particles and mononuclear Rh–NO sites depending on the changing gas composition. At lower temperatures (473 K), there is interconversion between mononuclear Rh(CO)2 and Rh(NO) centers.
Dent et al. (Mon,) studied this question.