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 journal › Article › Scientific › peer-review

5 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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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 journal › Article › Scientific › peer-review

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AB - 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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Lehtoranta K, Murtonen T, Vesala H, Koponen P, Alanen J, Simonen P et al. Natural Gas Engine Emission Reduction by Catalysts. Emission Control Science and Technology. 2017 Jun 1;3(2):142-152. https://doi.org/10.1007/s40825-016-0057-8

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