Natural Gas Engine Emission Reduction by Catalysts

Kati Lehtoranta, Timo Murtonen, Hannu Vesala, Päivi Koponen, Jenni Alanen, Pauli Simonen, Topi Rönkkö, Hilkka Timonen, Sanna Saarikoski, Teuvo Maunula, Kauko Kallinen, Satu Korhonen

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)

    Abstract

    In order to meet stringent emission limits, after-treatment systems are increasingly utilized in natural gas engine applications. In this work, two catalyst systems were studied in order to clarify how the catalysts affect, e.g. hydrocarbons, NOx and particles present in natural gas engine exhaust. A passenger car engine modified to run with natural gas was used in a research facility with possibilities to modify the exhaust gas properties. High NOx reductions were observed when using selective catalytic reduction, although a clear decrease in the NOx reduction was recorded at higher temperatures. The relatively fresh methane oxidation catalyst was found to reach reductions greater than 50% when the exhaust temperature and the catalyst size were sufficient. Both the studied catalyst systems were found to have a significant effect on particulate emissions. The observed particle mass reduction was found to be due to a decrease in the amount of organics passing over the catalyst. However, especially at high exhaust temperatures, high nanoparticle concentrations were observed downstream of the catalysts together with higher sulphate concentrations in particles. This study contributes to understanding emissions from future natural gas engine applications with catalysts in use.
    Original languageEnglish
    Pages (from-to)142-152
    Number of pages11
    JournalEmission Control Science and Technology
    Volume3
    Issue number2
    DOIs
    Publication statusPublished - 1 Jun 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Natural Gas
    Gas engines
    natural gas
    Natural gas
    catalyst
    Catalysts
    Temperature
    Vehicle Emissions
    Aftercare
    Methane
    Hydrocarbons
    Nanoparticles
    Sulfates
    Gases
    Particulate emissions
    Exhaust systems (engine)
    Selective catalytic reduction
    emission reduction
    gas engine
    Passenger cars

    Keywords

    • natural gas
    • engine emissions
    • methane oxidation
    • NOx reduction
    • nanoparticles
    • Nanoparticles
    • NO reduction

    Cite this

    Lehtoranta, Kati ; Murtonen, Timo ; Vesala, Hannu ; Koponen, Päivi ; Alanen, Jenni ; Simonen, Pauli ; Rönkkö, Topi ; Timonen, Hilkka ; Saarikoski, Sanna ; Maunula, Teuvo ; Kallinen, Kauko ; Korhonen, Satu. / Natural Gas Engine Emission Reduction by Catalysts. In: Emission Control Science and Technology. 2017 ; Vol. 3, No. 2. pp. 142-152.
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    title = "Natural Gas Engine Emission Reduction by Catalysts",
    abstract = "In order to meet stringent emission limits, after-treatment systems are increasingly utilized in natural gas engine applications. In this work, two catalyst systems were studied in order to clarify how the catalysts affect, e.g. hydrocarbons, NOx and particles present in natural gas engine exhaust. A passenger car engine modified to run with natural gas was used in a research facility with possibilities to modify the exhaust gas properties. High NOx reductions were observed when using selective catalytic reduction, although a clear decrease in the NOx reduction was recorded at higher temperatures. The relatively fresh methane oxidation catalyst was found to reach reductions greater than 50{\%} when the exhaust temperature and the catalyst size were sufficient. Both the studied catalyst systems were found to have a significant effect on particulate emissions. The observed particle mass reduction was found to be due to a decrease in the amount of organics passing over the catalyst. However, especially at high exhaust temperatures, high nanoparticle concentrations were observed downstream of the catalysts together with higher sulphate concentrations in particles. This study contributes to understanding emissions from future natural gas engine applications with catalysts in use.",
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    author = "Kati Lehtoranta and Timo Murtonen and Hannu Vesala and P{\"a}ivi Koponen and Jenni Alanen and Pauli Simonen and Topi R{\"o}nkk{\"o} and Hilkka Timonen and Sanna Saarikoski and Teuvo Maunula and Kauko Kallinen and Satu Korhonen",
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    Lehtoranta, K, Murtonen, T, Vesala, H, Koponen, P, Alanen, J, Simonen, P, Rönkkö, T, Timonen, H, Saarikoski, S, Maunula, T, Kallinen, K & Korhonen, S 2017, 'Natural Gas Engine Emission Reduction by Catalysts', Emission Control Science and Technology, vol. 3, no. 2, pp. 142-152. https://doi.org/10.1007/s40825-016-0057-8

    Natural Gas Engine Emission Reduction by Catalysts. / Lehtoranta, Kati; Murtonen, Timo; Vesala, Hannu; Koponen, Päivi; Alanen, Jenni; Simonen, Pauli; Rönkkö, Topi; Timonen, Hilkka; Saarikoski, Sanna; Maunula, Teuvo; Kallinen, Kauko; Korhonen, Satu.

    In: Emission Control Science and Technology, Vol. 3, No. 2, 01.06.2017, p. 142-152.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Simonen, Pauli

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    AU - Saarikoski, Sanna

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