Abstract
A series of Pt–Pd bimetallic catalysts supported on CeO2–ZrO2–La2O3 mixed oxides were synthesized through the conventional impregnation method. Three-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure–activity correlations. Results show that on the one hand, different Pt/Pd ratios can strongly affect the TWC behaviors of Pt–Pd/CZL catalysts by modulating the synergistic effect between Pt and Pd. On the other hand, higher Pt/Pd ratio also favors better dispersion of precious metals. Such improved precious metals (PM) dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration, thereby raising the dynamic oxygen storage/release capacity, improving the redox ability as well as enhancing the thermal stability of the Pt–Pd/CZL catalyst. Moreover, the strong metal-support interaction can augment surface oxygen vacancy concentration, thereby benefiting low temperature CO and NO reaction via augmented NOx adsorption and nitrate conversion.
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