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The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II: Characterization of Structural Changes by Transmission Electron Microscopy

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The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II : Characterization of Structural Changes by Transmission Electron Microscopy. / Honkanen, Mari; Kärkkäinen, Marja; Heikkinen, Olli; Kallinen, Kauko; Kolli, Tanja; Huuhtanen, Mika; Lahtinen, Jouko; Keiski, Riitta L.; Lepistö, Toivo; Vippola, Minnamari.

In: Topics in Catalysis, Vol. 58, No. 14, 10.2015, p. 971-976.

Research output: Contribution to journalArticleScientificpeer-review

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Honkanen, M, Kärkkäinen, M, Heikkinen, O, Kallinen, K, Kolli, T, Huuhtanen, M, Lahtinen, J, Keiski, RL, Lepistö, T & Vippola, M 2015, 'The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II: Characterization of Structural Changes by Transmission Electron Microscopy', Topics in Catalysis, vol. 58, no. 14, pp. 971-976. https://doi.org/10.1007/s11244-015-0465-y

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Honkanen, Mari ; Kärkkäinen, Marja ; Heikkinen, Olli ; Kallinen, Kauko ; Kolli, Tanja ; Huuhtanen, Mika ; Lahtinen, Jouko ; Keiski, Riitta L. ; Lepistö, Toivo ; Vippola, Minnamari. / The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II : Characterization of Structural Changes by Transmission Electron Microscopy. In: Topics in Catalysis. 2015 ; Vol. 58, No. 14. pp. 971-976.

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@article{274c94cc1d7444a19d094b297fdba27a,
title = "The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II: Characterization of Structural Changes by Transmission Electron Microscopy",
abstract = "Phosphorus poisoning and its effect on the diesel oxidation catalysts morphology was studied by transmission electron microscopy (TEM). The studied catalyst samples were PtPd or Pt supported on the alumina-based washcoat including additives. The laboratory-scale phosphorus exposures were carried out with two different phosphorus concentrations. The cross-sectional TEM samples were prepared from the fresh and phosphorus-treated catalysts. After phosphorus exposures, significant structural changes were observed compared to the fresh catalysts. The shape of the noble metal particles had changed from irregular to more spherical-shaped particles. In addition, phosphorus was detected throughout the catalyst TEM samples but the amount varied depending on the local composition of the support. Phosphorus accumulated mainly in the alumina-containing areas of the support and indications of dense and amorphous aluminium phosphates were found. Based on the results gained, cross-sectional TEM characterization is essential to observe these kinds of morphological changes in the catalysts caused e.g. by phosphorus exposures. In addition, cross-sectional TEM samples are needed to study the effect of local variation in the support composition on the phosphorus accumulation.",
keywords = "Diesel oxidation catalyst, Phosphorus poisoning, Structural characterization, Transmission electron microscopy, 3-WAY CATALYST, DEACTIVATION, MECHANISMS, EXHAUST, IMPACT",
author = "Mari Honkanen and Marja K{\"a}rkk{\"a}inen and Olli Heikkinen and Kauko Kallinen and Tanja Kolli and Mika Huuhtanen and Jouko Lahtinen and Keiski, {Riitta L.} and Toivo Lepist{\"o} and Minnamari Vippola",
year = "2015",
month = "10",
doi = "10.1007/s11244-015-0465-y",
language = "English",
volume = "58",
pages = "971--976",
journal = "Topics in Catalysis",
issn = "1022-5528",
publisher = "SPRINGER/PLENUM PUBLISHERS",
number = "14",

}

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TY - JOUR

T1 - The Effect of Phosphorus Exposure on Diesel Oxidation Catalysts-Part II

T2 - Characterization of Structural Changes by Transmission Electron Microscopy

AU - Honkanen, Mari

AU - Kärkkäinen, Marja

AU - Heikkinen, Olli

AU - Kallinen, Kauko

AU - Kolli, Tanja

AU - Huuhtanen, Mika

AU - Lahtinen, Jouko

AU - Keiski, Riitta L.

AU - Lepistö, Toivo

AU - Vippola, Minnamari

PY - 2015/10

Y1 - 2015/10

N2 - Phosphorus poisoning and its effect on the diesel oxidation catalysts morphology was studied by transmission electron microscopy (TEM). The studied catalyst samples were PtPd or Pt supported on the alumina-based washcoat including additives. The laboratory-scale phosphorus exposures were carried out with two different phosphorus concentrations. The cross-sectional TEM samples were prepared from the fresh and phosphorus-treated catalysts. After phosphorus exposures, significant structural changes were observed compared to the fresh catalysts. The shape of the noble metal particles had changed from irregular to more spherical-shaped particles. In addition, phosphorus was detected throughout the catalyst TEM samples but the amount varied depending on the local composition of the support. Phosphorus accumulated mainly in the alumina-containing areas of the support and indications of dense and amorphous aluminium phosphates were found. Based on the results gained, cross-sectional TEM characterization is essential to observe these kinds of morphological changes in the catalysts caused e.g. by phosphorus exposures. In addition, cross-sectional TEM samples are needed to study the effect of local variation in the support composition on the phosphorus accumulation.

AB - Phosphorus poisoning and its effect on the diesel oxidation catalysts morphology was studied by transmission electron microscopy (TEM). The studied catalyst samples were PtPd or Pt supported on the alumina-based washcoat including additives. The laboratory-scale phosphorus exposures were carried out with two different phosphorus concentrations. The cross-sectional TEM samples were prepared from the fresh and phosphorus-treated catalysts. After phosphorus exposures, significant structural changes were observed compared to the fresh catalysts. The shape of the noble metal particles had changed from irregular to more spherical-shaped particles. In addition, phosphorus was detected throughout the catalyst TEM samples but the amount varied depending on the local composition of the support. Phosphorus accumulated mainly in the alumina-containing areas of the support and indications of dense and amorphous aluminium phosphates were found. Based on the results gained, cross-sectional TEM characterization is essential to observe these kinds of morphological changes in the catalysts caused e.g. by phosphorus exposures. In addition, cross-sectional TEM samples are needed to study the effect of local variation in the support composition on the phosphorus accumulation.

KW - Diesel oxidation catalyst

KW - Phosphorus poisoning

KW - Structural characterization

KW - Transmission electron microscopy

KW - 3-WAY CATALYST

KW - DEACTIVATION

KW - MECHANISMS

KW - EXHAUST

KW - IMPACT

U2 - 10.1007/s11244-015-0465-y

DO - 10.1007/s11244-015-0465-y

M3 - Article

VL - 58

SP - 971

EP - 976

JO - Topics in Catalysis

JF - Topics in Catalysis

SN - 1022-5528

IS - 14

ER -