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

Amanatidis, Stavros and Ntziachristos, Leonidas and Karjalainen, Panu and Saukko, Erkka and Simonen, Pauli and Kuittinen, Niina and Aakko-Saksa, Päivi and Timonen, Hilkka and Rönkkö, Topi and Keskinen, Jorma (2018) Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols. Aerosol Science and Technology, 52 (4). pp. 420-432. ISSN 0278-6826. http://resolver.caltech.edu/CaltechAUTHORS:20180411-135507385

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1080/02786826.2017.1422236DOIArticle
ORCID:
AuthorORCID
Karjalainen, Panu0000-0003-2824-0033
Additional Information:© 2018 American Association for Aerosol Research. Received 29 September 2017. Accepted 15 December 2017. Neste Oyj is thanked for providing one of the test fuels. The authors would like to acknowledge the contributions of the VTT marine engine laboratory staff. This work was conducted in the framework of the HERE project funded by Tekes (the Finnish Funding Agency for Innovation), Agco Power Oy, Dinex Ecocat Oy, Dekati Oy, Neste Oyj, Pegasor Oy, and Wärtsilä Finland Oy. The tests on marine engine aerosol were realized within the project SEA-EFFECTS BC that is funded by Tekes, Wärtsilä, Pegasor, Spectral Engines, Gasmet, VG-Shipping, HaminaKotka Satama Oy, Oiltanking Finland Oy, and Kine Robotics.
Funders:
Funding AgencyGrant Number
Finnish Funding Agency for Technology and InnovationUNSPECIFIED
Record Number:CaltechAUTHORS:20180411-135507385
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180411-135507385
Official Citation:Stavros Amanatidis, Leonidas Ntziachristos, Panu Karjalainen, Erkka Saukko, Pauli Simonen, Niina Kuittinen, Päivi Aakko-Saksa, Hilkka Timonen, Topi Rönkkö & Jorma Keskinen (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, DOI: 10.1080/02786826.2017.1422236
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85768
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:11 Apr 2018 22:58
Last Modified:11 Apr 2018 22:58

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