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

3 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

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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.",
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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 - Amanatidis, Stavros

AU - Ntziachristos, Leonidas

AU - Karjalainen, Panu

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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