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Adverse effects of potassium on NOx reduction over Di-Air catalyst (Rh/La-Ce-Zr)

Journal Article (2019)
Author(s)

Yixiao Wang (TU Delft - ChemE/Catalysis Engineering)

Michiel Makkee (TU Delft - ChemE/Catalysis Engineering)

Research Group
ChemE/Catalysis Engineering
DOI related publication
https://doi.org/10.1016/j.apcatb.2019.117895
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Publication Year
2019
Language
English
Research Group
ChemE/Catalysis Engineering
Volume number
259
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Abstract

The influence of potassium in Rh on a lanthium promoted zirconia stablised ceria (CZ) catalysts was studied toward NOxreduction reactivity and selectivity. The results are compared with a Rh/CZ catalyst. The samples were characterised by N2 adsorption, XRD, SEM, ICP, and H2-TPR. The study highlighted the importance of stored NOx regeneration over potassium in determining the overall performance of the Rh/K/CZ catalyst. The NOx stored over Rh/K/CZ in the previous NO gas stream cannot be regenerated sufficiently during the C3H6 gas stream, and stored NOxgradually decreased from one cycle to the next, resulting in deteriorating performance of Rh/K/CZ. Besides, problem of NOx slip, the formation of both NH3 and N2O (selectivities up to 30% for each side product) were observed by the addition of potassium into the Rh/CZ catalyst system, depending on the reaction conditions applied and the severity of the catalyst deactivation.