Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols

Stavros Amanatidis, Leonidas Ntziachristos, Panu Karjalainen, Erkka Saukko, Pauli Simonen, Niina Kuittinen, Päivi Aakko-Saksa, Hilkka Timonen, Topi Rönkkö, Jorma Keskinen

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    The performance of a thermal denuder (thermodenuder—TD) and a fresh catalytic stripper (CS) was assessed by sampling laboratory aerosol, produced by different combinations of sulfuric acid, octacosane, and soot particles, and marine exhaust aerosol produced by a medium-speed marine engine using high sulfur fuels. The intention was to study the efficiency in separating non-volatile particles. No particles could be detected downstream of either device when challenged with neat octacosane particles at high concentration. Both laboratory and marine exhaust aerosol measurements showed that sub-23 nm semi-volatile particles are formed downstream of the thermodenuder when upstream sulfuric acid approached 100 ppbv. Charge measurements revealed that these are formed by re-nucleation rather than incomplete evaporation of upstream aerosol. Sufficient dilution to control upstream sulfates concentration and moderate TD operation temperature (250°C) are both required to eliminate their formation. Use of the CS following an evaporation tube seemed to eliminate the risk for particle re-nucleation, even at a ten-fold higher concentration of semi-volatiles than in case of the TD. Particles detected downstream of the CS due to incomplete evaporation of sulfuric acid and octacosane aerosol, did not exceed 0.01% of upstream concentration. Despite the superior performance of CS in separating non-volatile particles, the TD may still be useful in cases where increased sensitivity over the traditional evaporation tube method is needed and where high sulfur exhaust concentration may fast deplete the catalytic stripper adsorption capacity.

    Original languageEnglish
    Pages (from-to)420-432
    Number of pages13
    JournalAerosol Science and Technology
    Volume52
    Issue number4
    DOIs
    Publication statusPublished - 16 Jan 2018
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Aerosols
    aerosol
    Sampling
    Evaporation
    Sulfuric acid
    sampling
    Sulfur
    evaporation
    Particles (particulate matter)
    sulfuric acid
    Nucleation
    Soot
    Marine engines
    nucleation
    sulfur
    Dilution
    Sulfates
    Hot Temperature
    particle
    laboratory

    Cite this

    Amanatidis, S., Ntziachristos, L., Karjalainen, P., Saukko, E., Simonen, P., Kuittinen, N., ... Keskinen, J. (2018). Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols. Aerosol Science and Technology, 52(4), 420-432. https://doi.org/10.1080/02786826.2017.1422236
    Amanatidis, Stavros ; Ntziachristos, Leonidas ; Karjalainen, Panu ; Saukko, Erkka ; Simonen, Pauli ; Kuittinen, Niina ; Aakko-Saksa, Päivi ; Timonen, Hilkka ; Rönkkö, Topi ; Keskinen, Jorma. / Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols. In: Aerosol Science and Technology. 2018 ; Vol. 52, No. 4. pp. 420-432.
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    abstract = "The performance of a thermal denuder (thermodenuder—TD) and a fresh catalytic stripper (CS) was assessed by sampling laboratory aerosol, produced by different combinations of sulfuric acid, octacosane, and soot particles, and marine exhaust aerosol produced by a medium-speed marine engine using high sulfur fuels. The intention was to study the efficiency in separating non-volatile particles. No particles could be detected downstream of either device when challenged with neat octacosane particles at high concentration. Both laboratory and marine exhaust aerosol measurements showed that sub-23 nm semi-volatile particles are formed downstream of the thermodenuder when upstream sulfuric acid approached 100 ppbv. Charge measurements revealed that these are formed by re-nucleation rather than incomplete evaporation of upstream aerosol. Sufficient dilution to control upstream sulfates concentration and moderate TD operation temperature (250°C) are both required to eliminate their formation. Use of the CS following an evaporation tube seemed to eliminate the risk for particle re-nucleation, even at a ten-fold higher concentration of semi-volatiles than in case of the TD. Particles detected downstream of the CS due to incomplete evaporation of sulfuric acid and octacosane aerosol, did not exceed 0.01{\%} of upstream concentration. Despite the superior performance of CS in separating non-volatile particles, the TD may still be useful in cases where increased sensitivity over the traditional evaporation tube method is needed and where high sulfur exhaust concentration may fast deplete the catalytic stripper adsorption capacity.",
    author = "Stavros Amanatidis and Leonidas Ntziachristos and Panu Karjalainen and Erkka Saukko and Pauli Simonen and Niina Kuittinen and P{\"a}ivi Aakko-Saksa and Hilkka Timonen and Topi R{\"o}nkk{\"o} and Jorma Keskinen",
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    Amanatidis, S, Ntziachristos, L, Karjalainen, P, Saukko, E, Simonen, P, Kuittinen, N, Aakko-Saksa, P, Timonen, H, Rönkkö, T & Keskinen, J 2018, 'Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols', Aerosol Science and Technology, vol. 52, no. 4, pp. 420-432. https://doi.org/10.1080/02786826.2017.1422236

    Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols. / Amanatidis, Stavros; Ntziachristos, Leonidas; Karjalainen, Panu; Saukko, Erkka; Simonen, Pauli; Kuittinen, Niina; Aakko-Saksa, Päivi; Timonen, Hilkka; Rönkkö, Topi; Keskinen, Jorma.

    In: Aerosol Science and Technology, Vol. 52, No. 4, 16.01.2018, p. 420-432.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Ntziachristos, Leonidas

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    AU - Saukko, Erkka

    AU - Simonen, Pauli

    AU - Kuittinen, Niina

    AU - Aakko-Saksa, Päivi

    AU - Timonen, Hilkka

    AU - Rönkkö, Topi

    AU - Keskinen, Jorma

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