Effects of the addition of small quantities of ceria on the catalytic behavior of Pd-only close-coupled catalysts during automobile exhaust elimination

doi:10.1016/S1872-2067(14)60157-1

Abstract

Abstract:

A series of La-Al₂O₃ supported Pd-Ce close-coupled catalysts were synthesized by a co-adsorption impregnation method and subsequently investigated. In the case of fresh catalysts, the presence of an optimal concentration of ceria obviously promoted the catalytic activity during HC and NO_x eliminations, owing to the interaction between the palladium oxide species (PdO_x) and CeO₂ that improves the oxidation of Pd⁰ to PdO and enhances the adsorption of nitrite/nitrates and isocyanate intermediate species on the support under reaction conditions. Pd-Ce(2.0)/La-Al₂O₃ catalyst (where 2.0 is the wt% of CeO₂) exhibited the highest catalytic activity for HC and NO eliminations. Following aging at 1100 ℃, the operational window for HC and NO_x conversions was broadened and the thermal stability of the catalysts was also improved as a result of the presence of an appropriate quantity of ceria (2.0-4.0 wt%). The enhanced interactions between PdO_x and CeO₂ evidently led to the formation of a Pd-O-Ce system, stabilizing PdO_x species with smaller particle sizes at high temperatures. This result is significant since it suggests a means of improving the catalytic performance of Pd-only close-coupled catalysts during automobile exhaust elimination.

Key words: Palladium-only close-coupled catalyst, Catalytic behavior, Appropriate ceria, Thermal stability, In situ diffuse reflectance infrared Fourier transform spectroscopy

Xue Yang, Linyan Yang, Siyu Lin, Renxian Zhou. Effects of the addition of small quantities of ceria on the catalytic behavior of Pd-only close-coupled catalysts during automobile exhaust elimination[J]. Chinese Journal of Catalysis, 2014, 35(8): 1267-1280.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60157-1

https://www.cjcatal.com/EN/Y2014/V35/I8/1267

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