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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
Metadata
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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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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.