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The effective elimination of N 2 O from automobile exhaust at low temperatures poses significant challenges. Compared to other materials, supported RhO x catalysts exhibit high N 2 O decomposition activities, even in the presence of O 2, CO 2, and H 2 O. Metal additives can enhance the low-temperature N 2 O decomposition activities over supported RhO x catalysts; however, the enhancement mechanism and active sites require further investigation. In this study, we demonstrate the significant enhancement of the low-temperature N 2 O decomposition activity of a monoclinic ZrO 2 -supported Rh catalyst Rh(1)/ZrO 2 with Ir addition in the presence of N 2 O + O 2 + CO 2 + H 2 O. The promotional effect of Ir and the active sites on N 2 O decomposition in Rh(1)–Ir(1)/ZrO 2 (Rh = 1 wt % and Ir = 1 wt %) were investigated by kinetic studies and in situ spectroscopic methods, including X-ray absorption spectroscopy, ambient-pressure X-ray photoelectron spectroscopy, and ultraviolet–visible spectroscopy. These results indicate that both surface Rh and Ir species in Rh(1)–Ir(1)/ZrO 2 were active sites for N 2 O catalytic decomposition at low temperatures, and Ir augmentation promoted the desorption of gaseous O 2, which are regarded as key steps in N 2 O decomposition.
Zhang et al. (Wed,) studied this question.