Abstract
How metal-support interaction (MSI) affects three-way catalysts (TWCs) performance has always been a focus. This work regulated the interaction between Rh and CeO2-ZrO2 (CZ) by support pretreatment scheme, meanwhile deeply analyzed the effect on activity and stability. CZ after 1000 ℃ pretreatment weakened the MSI and made more active Rh on CZ surface, which significantly enhanced catalytic efficiency (C3H8 T90 decreased by 40 ℃). However, this weakened MSI prevented CZ from anchoring Rh, leading to the growth of Rh after aging and adversely affecting anti-aging ability (T90 increased by 90 °C). Fortunately, when CZ pretreatment at 900 °C, the catalytic performance did not decrease after aging due to the retained strong MSI. In addition, the change of oxygen vacancy concentration caused by CZ pretreatment was positively correlated with MSI strength. This work provided an in-depth understanding for MSI and a new idea for Rh-based TWCs design by elucidating the correlation between MSI and TWCs performance.
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