Effect of chromium migration from metallic supports on the activity of diesel exhaust catalysts

W. Kaltner; M. Veprek-Heijman; A. Jentys; J. A. Lercher

doi:10.1016/j.apcatb.2008.12.006

Effect of chromium migration from metallic supports on the activity of diesel exhaust catalysts

W. Kaltner, M. Veprek-Heijman, A. Jentys, J. A. Lercher

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Fe-Cr-Ni and Fe-Cr-Al sintered spheres are explored as alternative support structures for automotive exhaust catalysts. Initially the activity of Pt supported on the metal support and on ceramic monoliths (cordierite) for the oxidation of CO and NO is comparable. However, after thermal aging at elevated temperatures (800 °C) and extended reaction times (24 h) the activity for the oxidation of NO of the catalysts supported on the Fe-Cr-Ni spheres decreases significantly, which is attributed to the migration of chromium from the metal bulk phase into washcoat. In the contrary, the aluminium present in the Fe-Cr-Al steel alloy formed a protective alumina barrier inhibiting the degradation of the catalyst after aging by blocking the migration of chromium to the surface.

Original language	English
Pages (from-to)	123-127
Number of pages	5
Journal	Applied Catalysis B: Environmental
Volume	89
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2008.12.006
State	Published - 3 Jul 2009

Keywords

Cr diffusion
Metallic support structures
Oxidation catalysts

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10.1016/j.apcatb.2008.12.006

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title = "Effect of chromium migration from metallic supports on the activity of diesel exhaust catalysts",

abstract = "Fe-Cr-Ni and Fe-Cr-Al sintered spheres are explored as alternative support structures for automotive exhaust catalysts. Initially the activity of Pt supported on the metal support and on ceramic monoliths (cordierite) for the oxidation of CO and NO is comparable. However, after thermal aging at elevated temperatures (800 °C) and extended reaction times (24 h) the activity for the oxidation of NO of the catalysts supported on the Fe-Cr-Ni spheres decreases significantly, which is attributed to the migration of chromium from the metal bulk phase into washcoat. In the contrary, the aluminium present in the Fe-Cr-Al steel alloy formed a protective alumina barrier inhibiting the degradation of the catalyst after aging by blocking the migration of chromium to the surface.",

keywords = "Cr diffusion, Metallic support structures, Oxidation catalysts",

author = "W. Kaltner and M. Veprek-Heijman and A. Jentys and Lercher, {J. A.}",

note = "Funding Information: This work was supported by the Bundesministerium f{\"u}r Bildung und Forschung (BMBF) under the WING initiative (project number 03X3004). SEM and EDX measurements were done by M. Neukamm at the Chair of Technical Chemistry II at TUM Garching.",

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doi = "10.1016/j.apcatb.2008.12.006",

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T1 - Effect of chromium migration from metallic supports on the activity of diesel exhaust catalysts

AU - Kaltner, W.

AU - Veprek-Heijman, M.

AU - Jentys, A.

AU - Lercher, J. A.

N1 - Funding Information: This work was supported by the Bundesministerium für Bildung und Forschung (BMBF) under the WING initiative (project number 03X3004). SEM and EDX measurements were done by M. Neukamm at the Chair of Technical Chemistry II at TUM Garching.

PY - 2009/7/3

Y1 - 2009/7/3

N2 - Fe-Cr-Ni and Fe-Cr-Al sintered spheres are explored as alternative support structures for automotive exhaust catalysts. Initially the activity of Pt supported on the metal support and on ceramic monoliths (cordierite) for the oxidation of CO and NO is comparable. However, after thermal aging at elevated temperatures (800 °C) and extended reaction times (24 h) the activity for the oxidation of NO of the catalysts supported on the Fe-Cr-Ni spheres decreases significantly, which is attributed to the migration of chromium from the metal bulk phase into washcoat. In the contrary, the aluminium present in the Fe-Cr-Al steel alloy formed a protective alumina barrier inhibiting the degradation of the catalyst after aging by blocking the migration of chromium to the surface.

AB - Fe-Cr-Ni and Fe-Cr-Al sintered spheres are explored as alternative support structures for automotive exhaust catalysts. Initially the activity of Pt supported on the metal support and on ceramic monoliths (cordierite) for the oxidation of CO and NO is comparable. However, after thermal aging at elevated temperatures (800 °C) and extended reaction times (24 h) the activity for the oxidation of NO of the catalysts supported on the Fe-Cr-Ni spheres decreases significantly, which is attributed to the migration of chromium from the metal bulk phase into washcoat. In the contrary, the aluminium present in the Fe-Cr-Al steel alloy formed a protective alumina barrier inhibiting the degradation of the catalyst after aging by blocking the migration of chromium to the surface.

KW - Cr diffusion

KW - Metallic support structures

KW - Oxidation catalysts

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DO - 10.1016/j.apcatb.2008.12.006

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VL - 89

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EP - 127

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

IS - 1-2

ER -

Effect of chromium migration from metallic supports on the activity of diesel exhaust catalysts

Abstract

Keywords

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