Coke deposition on automotive three-way catalysts studied with LEIS

J.M.A. Harmsen; W.P.A. Jansen; J.H.B.J. Hoebink; J.C. Schouten; H.H. Brongersma

doi:10.1023/A:1016633114136

Coke deposition on automotive three-way catalysts studied with LEIS

J.M.A. Harmsen, W.P.A. Jansen, J.H.B.J. Hoebink, J.C. Schouten, H.H. Brongersma

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Abstract

LEIS (low-energy ion scattering spectroscopy) measurements have been performed on fresh and used com. three-way catalysts (Pt/Rh/CeO2/g-Al2O3). The catalysts showed a significant decrease in the platinum surface concn. of approx. 50% after use in hydrocarbon oxidn. at cold-start conditions, and could be completely regenerated. The selectivity of LEIS towards the outermost at. layer allowed a one to one correlation between the surface Pt concn. as detected with LEIS and that obtained by kinetic modeling. This supports recent assumptions on selective deactivation. Conventional surface science techniques such as XPS, SIMS, or AES would have yielded ambiguous results, since their probing depths are not limited to the outermost at. layer.

Original language	English
Pages (from-to)	133-137
Journal	Catalysis Letters
Volume	74
Issue number	3-4
DOIs	https://doi.org/10.1023/A:1016633114136
Publication status	Published - 2001

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title = "Coke deposition on automotive three-way catalysts studied with LEIS",

abstract = "LEIS (low-energy ion scattering spectroscopy) measurements have been performed on fresh and used com. three-way catalysts (Pt/Rh/CeO2/g-Al2O3). The catalysts showed a significant decrease in the platinum surface concn. of approx. 50% after use in hydrocarbon oxidn. at cold-start conditions, and could be completely regenerated. The selectivity of LEIS towards the outermost at. layer allowed a one to one correlation between the surface Pt concn. as detected with LEIS and that obtained by kinetic modeling. This supports recent assumptions on selective deactivation. Conventional surface science techniques such as XPS, SIMS, or AES would have yielded ambiguous results, since their probing depths are not limited to the outermost at. layer.",

author = "J.M.A. Harmsen and W.P.A. Jansen and J.H.B.J. Hoebink and J.C. Schouten and H.H. Brongersma",

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doi = "10.1023/A:1016633114136",

language = "English",

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pages = "133--137",

journal = "Catalysis Letters",

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T1 - Coke deposition on automotive three-way catalysts studied with LEIS

AU - Harmsen, J.M.A.

AU - Jansen, W.P.A.

AU - Hoebink, J.H.B.J.

AU - Schouten, J.C.

AU - Brongersma, H.H.

PY - 2001

Y1 - 2001

N2 - LEIS (low-energy ion scattering spectroscopy) measurements have been performed on fresh and used com. three-way catalysts (Pt/Rh/CeO2/g-Al2O3). The catalysts showed a significant decrease in the platinum surface concn. of approx. 50% after use in hydrocarbon oxidn. at cold-start conditions, and could be completely regenerated. The selectivity of LEIS towards the outermost at. layer allowed a one to one correlation between the surface Pt concn. as detected with LEIS and that obtained by kinetic modeling. This supports recent assumptions on selective deactivation. Conventional surface science techniques such as XPS, SIMS, or AES would have yielded ambiguous results, since their probing depths are not limited to the outermost at. layer.

AB - LEIS (low-energy ion scattering spectroscopy) measurements have been performed on fresh and used com. three-way catalysts (Pt/Rh/CeO2/g-Al2O3). The catalysts showed a significant decrease in the platinum surface concn. of approx. 50% after use in hydrocarbon oxidn. at cold-start conditions, and could be completely regenerated. The selectivity of LEIS towards the outermost at. layer allowed a one to one correlation between the surface Pt concn. as detected with LEIS and that obtained by kinetic modeling. This supports recent assumptions on selective deactivation. Conventional surface science techniques such as XPS, SIMS, or AES would have yielded ambiguous results, since their probing depths are not limited to the outermost at. layer.

U2 - 10.1023/A:1016633114136

DO - 10.1023/A:1016633114136

M3 - Article

SN - 1011-372X

VL - 74

SP - 133

EP - 137

JO - Catalysis Letters

JF - Catalysis Letters

IS - 3-4

ER -

Coke deposition on automotive three-way catalysts studied with LEIS

Abstract

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