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Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations

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Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations. / Väliheikki, Ari; Kärkkäinen, Marja; Honkanen, Mari; Heikkinen, Olli; Kolli, Tanja; Kallinen, Kauko; Huuhtanen, Mika; Vippola, Minnamari; Lahtinen, Jouko; Keiski, Riitta L.

In: Applied Catalysis B-Environmental, Vol. 218, 05.12.2017, p. 409-419.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Väliheikki, A, Kärkkäinen, M, Honkanen, M, Heikkinen, O, Kolli, T, Kallinen, K, Huuhtanen, M, Vippola, M, Lahtinen, J & Keiski, RL 2017, 'Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations', Applied Catalysis B-Environmental, vol. 218, pp. 409-419. https://doi.org/10.1016/j.apcatb.2017.06.068

APA

Väliheikki, A., Kärkkäinen, M., Honkanen, M., Heikkinen, O., Kolli, T., Kallinen, K., ... Keiski, R. L. (2017). Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations. Applied Catalysis B-Environmental, 218, 409-419. https://doi.org/10.1016/j.apcatb.2017.06.068

Vancouver

Väliheikki A, Kärkkäinen M, Honkanen M, Heikkinen O, Kolli T, Kallinen K et al. Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations. Applied Catalysis B-Environmental. 2017 Dec 5;218:409-419. https://doi.org/10.1016/j.apcatb.2017.06.068

Author

Väliheikki, Ari ; Kärkkäinen, Marja ; Honkanen, Mari ; Heikkinen, Olli ; Kolli, Tanja ; Kallinen, Kauko ; Huuhtanen, Mika ; Vippola, Minnamari ; Lahtinen, Jouko ; Keiski, Riitta L. / Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations. In: Applied Catalysis B-Environmental. 2017 ; Vol. 218. pp. 409-419.

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@article{a46997e7a4f143468f9fb6d91a355baf,
title = "Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations",
abstract = "The impact of sulphur, phosphorus and water and their co-exposure on a monolith-type Pt/SiO2-ZrO2 diesel oxidation catalyst was investigated. The accelerated laboratory-scale sulphur treatments for Pt/SiO2-ZrO2 were done with and without water (S- and SW-treatments, respectively) at 400 °C. Similarly, the phosphorus treatment with water (PW-treatment) as well as the co-exposure of phosphorus, sulphur and water (PSW-treatment) were also done to find out the interactions between the impurities. The studied catalysts were characterized by using several techniques and the activity of the catalyst was tested in lean diesel exhaust gas conditions. Based on the XPS and the elemental analysis, more phosphorus was adsorbed on the Pt/SiO2-ZrO2 catalyst than sulphur. Sulphur, in the presence and absence of water, was found to have a negligible effect on the CO and C3H6 light-off temperatures (T90) over the fresh Pt/SiO2-ZrO2, whereas the T90 values of CO and C3H6 increased by 30–45 °C as a result of the PW-treatment and by 15–35 °C after the PSW-treatment. Based on the Transmission electron microscope (TEM) analyses, no morphological changes on the Pt/SiO2-ZrO2 surfaces were observed due to the phosphorus treatment. Therefore, the reason for the lower activity after the PW-treatment could be the formation of phosphates that are decreasing the specific surface area of the catalyst, blocking the accessibility of the reactants to the catalyst pores and active sites. However, it is worth noting that sulphur decreased the amount of adsorbed phosphorus and thus, inhibited the poisoning effect of phosphorus.",
keywords = "DOC, Phosphorus, Platinum, Silicon-zirconium oxide, Sulphur dioxide",
author = "Ari V{\"a}liheikki and Marja K{\"a}rkk{\"a}inen and Mari Honkanen and Olli Heikkinen and Tanja Kolli and Kauko Kallinen and Mika Huuhtanen and Minnamari Vippola and Jouko Lahtinen and Keiski, {Riitta L.}",
year = "2017",
month = "12",
day = "5",
doi = "10.1016/j.apcatb.2017.06.068",
language = "English",
volume = "218",
pages = "409--419",
journal = "Applied Catalysis B-Environmental",
issn = "0926-3373",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Deactivation of Pt/SiO2-ZrO2 diesel oxidation catalysts by sulphur, phosphorus and their combinations

AU - Väliheikki, Ari

AU - Kärkkäinen, Marja

AU - Honkanen, Mari

AU - Heikkinen, Olli

AU - Kolli, Tanja

AU - Kallinen, Kauko

AU - Huuhtanen, Mika

AU - Vippola, Minnamari

AU - Lahtinen, Jouko

AU - Keiski, Riitta L.

PY - 2017/12/5

Y1 - 2017/12/5

N2 - The impact of sulphur, phosphorus and water and their co-exposure on a monolith-type Pt/SiO2-ZrO2 diesel oxidation catalyst was investigated. The accelerated laboratory-scale sulphur treatments for Pt/SiO2-ZrO2 were done with and without water (S- and SW-treatments, respectively) at 400 °C. Similarly, the phosphorus treatment with water (PW-treatment) as well as the co-exposure of phosphorus, sulphur and water (PSW-treatment) were also done to find out the interactions between the impurities. The studied catalysts were characterized by using several techniques and the activity of the catalyst was tested in lean diesel exhaust gas conditions. Based on the XPS and the elemental analysis, more phosphorus was adsorbed on the Pt/SiO2-ZrO2 catalyst than sulphur. Sulphur, in the presence and absence of water, was found to have a negligible effect on the CO and C3H6 light-off temperatures (T90) over the fresh Pt/SiO2-ZrO2, whereas the T90 values of CO and C3H6 increased by 30–45 °C as a result of the PW-treatment and by 15–35 °C after the PSW-treatment. Based on the Transmission electron microscope (TEM) analyses, no morphological changes on the Pt/SiO2-ZrO2 surfaces were observed due to the phosphorus treatment. Therefore, the reason for the lower activity after the PW-treatment could be the formation of phosphates that are decreasing the specific surface area of the catalyst, blocking the accessibility of the reactants to the catalyst pores and active sites. However, it is worth noting that sulphur decreased the amount of adsorbed phosphorus and thus, inhibited the poisoning effect of phosphorus.

AB - The impact of sulphur, phosphorus and water and their co-exposure on a monolith-type Pt/SiO2-ZrO2 diesel oxidation catalyst was investigated. The accelerated laboratory-scale sulphur treatments for Pt/SiO2-ZrO2 were done with and without water (S- and SW-treatments, respectively) at 400 °C. Similarly, the phosphorus treatment with water (PW-treatment) as well as the co-exposure of phosphorus, sulphur and water (PSW-treatment) were also done to find out the interactions between the impurities. The studied catalysts were characterized by using several techniques and the activity of the catalyst was tested in lean diesel exhaust gas conditions. Based on the XPS and the elemental analysis, more phosphorus was adsorbed on the Pt/SiO2-ZrO2 catalyst than sulphur. Sulphur, in the presence and absence of water, was found to have a negligible effect on the CO and C3H6 light-off temperatures (T90) over the fresh Pt/SiO2-ZrO2, whereas the T90 values of CO and C3H6 increased by 30–45 °C as a result of the PW-treatment and by 15–35 °C after the PSW-treatment. Based on the Transmission electron microscope (TEM) analyses, no morphological changes on the Pt/SiO2-ZrO2 surfaces were observed due to the phosphorus treatment. Therefore, the reason for the lower activity after the PW-treatment could be the formation of phosphates that are decreasing the specific surface area of the catalyst, blocking the accessibility of the reactants to the catalyst pores and active sites. However, it is worth noting that sulphur decreased the amount of adsorbed phosphorus and thus, inhibited the poisoning effect of phosphorus.

KW - DOC

KW - Phosphorus

KW - Platinum

KW - Silicon-zirconium oxide

KW - Sulphur dioxide

U2 - 10.1016/j.apcatb.2017.06.068

DO - 10.1016/j.apcatb.2017.06.068

M3 - Article

VL - 218

SP - 409

EP - 419

JO - Applied Catalysis B-Environmental

JF - Applied Catalysis B-Environmental

SN - 0926-3373

ER -