Thermal stability and SO2 resistance of Pd/Rh-perovskite based three-way catalyst wash-coated on cordierite monoliths

Date

2022-01-01

Author

Bayram, Bilal
Önal, Işık
Külah, Görkem

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The effect of hydrothermal aging and SO2 poisoning on the three-way catalytic performance of dispersed Pd/Rh-based and Pd/Rh perovskite-based catalysts were studied by using a dynamic activity test system that simulates redox fluctuations of gasoline engine exhaust conditions. Both catalysts were supported on ceria-zirconia-alumina and wash-coated on cordierite monoliths and were characterized by ICP-OES, BET, XRD, TEM-EDX, DRIFTS, and CO chemisorption. Their performance was very close when the catalysts were fresh but, after 3 h of hydrothermal aging at 1000 degrees C, the dispersed Pd/Rh-based catalyst lost its performance especially with respect to C3H8 and NO conversions; however, the Pd/Rh perovskite-based catalyst kept its activity. Parallel to that, CO uptake capacity losses after hydrothermal aging were 85% and 30% for the dispersed metallic catalyst and the perovskite-based catalyst, respectively. Moreover, 20 ppm SO2 exposure decreased CO uptake capacities by 61% and 48% for the two catalysts, respectively.

Subject Keywords

Rh-Pd-Perovskite, SO2 poisoning, three-way catalysts, thermal stability, SELF-REGENERATION, OXIDATION CATALYST, PHASE-COMPOSITION, CARBON-MONOXIDE, CO OXIDATION, PD, TEMPERATURE, EXHAUST, OXIDE, DEACTIVATION

URI

https://hdl.handle.net/11511/95986

Journal

CHEMICAL ENGINEERING COMMUNICATIONS

DOI

https://doi.org/10.1080/00986445.2022.2030727

Collections

Department of Chemical Engineering, Article

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Citation Formats

B. Bayram, I. Önal, and G. Külah, “Thermal stability and SO2 resistance of Pd/Rh-perovskite based three-way catalyst wash-coated on cordierite monoliths,” CHEMICAL ENGINEERING COMMUNICATIONS, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/95986.