Abstract
Enhancing NO reduction efficiency of Pt-based three-way catalysts (TWCs) is very challenging due to poor NO activation ability. In this work, NO reduction performance was improved by introducing alkaline earth metals to adjust the electron environment of Pt, while the promoting effect was systematically studied. Structure-activity relationship indicated that NO reduction activity over the Pt-M/LA catalysts (M = Mg, Ca, Sr or Ba, LA = La-Al2O3) increases as the electronegativity of M decreases, and the TOF of Pt-Ba/LA is about 3 times more active than that of Pt/LA, which is attributed to more Pt0 species resulting from Pt-Ba interaction. Moreover, kinetic studies revealed that alkaline earth metals weaken the poisoning effect of CO and improve promoting effect of HCs, leading to an improved NO adsorption and an increased reaction rate of NO with CO and HCs. This study provides an insightful understanding for the promotional effect of alkaline earth metals on NO reduction over Pt-based TWCs.
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