Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Jose Herreros; Simaranjit Gill; Isaline Lefort; Athanasios Tsolakis; Paul Millington; Ed Moss

doi:10.1016/j.apcatb.2013.10.013

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Jose Herreros, Simaranjit Gill, Isaline Lefort, Athanasios Tsolakis, Paul Millington, Ed Moss

Mechanical Engineering

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Abstract

The influence of hydrogen over platinum and combined platinum–palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H₂ has been reported to have a positive effect on CO and HC oxidation as well as NO₂ formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H₂ oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H₂ concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum–palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H₂ increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.

Original language	English
Pages (from-to)	835-41
Journal	Applied Catalysis B: Environmental
Volume	147
Early online date	15 Oct 2013
DOIs	https://doi.org/10.1016/j.apcatb.2013.10.013
Publication status	Published - 5 Apr 2014

Keywords

hydrogen
diesel oxidation catalyst
platinum
palladium
exhaust emissions

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Herreros_et_al_Enhancing_low_temperature_oxidation_Applied_Catalysis_B_2014_Post-Print
NOTICE: this is the author’s version of a work that was accepted for publication in Applied Catalysis B: Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Catalysis B: Environmental, Vol 147, April 2014, DOI: 10.1016/j.apcatb.2013.10.013 Checked July 2015
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Cite this

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title = "Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst",

abstract = "The influence of hydrogen over platinum and combined platinum–palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H2 has been reported to have a positive effect on CO and HC oxidation as well as NO2 formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H2 oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H2 concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum–palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H2 increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.",

keywords = "hydrogen , diesel oxidation catalyst , platinum , palladium , exhaust emissions",

author = "Jose Herreros and Simaranjit Gill and Isaline Lefort and Athanasios Tsolakis and Paul Millington and Ed Moss",

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doi = "10.1016/j.apcatb.2013.10.013",

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TY - JOUR

T1 - Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

AU - Herreros, Jose

AU - Gill, Simaranjit

AU - Lefort, Isaline

AU - Tsolakis, Athanasios

AU - Millington, Paul

AU - Moss, Ed

PY - 2014/4/5

Y1 - 2014/4/5

N2 - The influence of hydrogen over platinum and combined platinum–palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H2 has been reported to have a positive effect on CO and HC oxidation as well as NO2 formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H2 oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H2 concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum–palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H2 increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.

AB - The influence of hydrogen over platinum and combined platinum–palladium diesel oxidation catalysts were investigated on the oxidation kinetics of CO, HC and NO. Although H2 has been reported to have a positive effect on CO and HC oxidation as well as NO2 formation over platinum catalysts, there is still uncertainty whether this is due to the temperature rise caused by H2 oxidation or the result of a change in the reaction kinetics of CO, HC and NO oxidation by the production of intermediate species. The results have showed smaller H2 concentrations are more effective in improving the catalyst light-off temperature as well as promoting NO oxidation over both platinum and platinum–palladium catalysts. It is suggested that these benefits are a result of not only the exothermic reactions which in turn increase the local catalyst temperature but also H2 increasing the rate of reactions and the species accessibility to the catalyst active sites thus further CO, HC and NO oxidation can occur at lower catalyst temperatures.

KW - hydrogen

KW - diesel oxidation catalyst

KW - platinum

KW - palladium

KW - exhaust emissions

U2 - 10.1016/j.apcatb.2013.10.013

DO - 10.1016/j.apcatb.2013.10.013

M3 - Article

SN - 0926-3373

VL - 147

SP - 835

EP - 841

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Enhancing the low temperature oxidation performance over a Pt and a Pt–Pd diesel oxidation catalyst

Abstract

Keywords

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