Effect of moisture on the adsorption of ammonia

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http://hdl.handle.net/10138/307288

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Vaittinen , O , Metsälä , M , Halonen , L , Persijn , S , Leuenberger , D & Niederhauser , B 2018 , ' Effect of moisture on the adsorption of ammonia ' , Applied physics. B, Lasers and optics , vol. 124 , no. 9 , 189 . https://doi.org/10.1007/s00340-018-7054-2

Title: Effect of moisture on the adsorption of ammonia
Author: Vaittinen, Olavi; Metsälä, Markus; Halonen, Lauri; Persijn, Stefan; Leuenberger, Daiana; Niederhauser, Bernhard
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2018-09
Language: eng
Number of pages: 8
Belongs to series: Applied physics. B, Lasers and optics
ISSN: 0946-2171
URI: http://hdl.handle.net/10138/307288
Abstract: The effect of moisture on the adsorption of ammonia was systematically studied using different surface materials and humidity levels. The experimental water amount fractions varied between 6 and 18,000 mu molmol(-1), and the ammonia amount fraction was 400nmolmol(-1). The investigated materials included plain 316L stainless steel and stainless steel cured with Dursan, SilcoNert 2000 and halocarbon wax coatings. Furthermore, Teflon (PTFE) and polyvinylidene difluoride (PVDF) polymer surfaces were studied. Dynamically diluted ammonia, test tubes prepared with the investigated materials, a commercial ammonia analyzer based on cavity ring-down spectroscopy, and a commercial dew-point transmitter were employed. The adsorption was assessed quantitatively using continuous flow conditions and real-time monitoring of the adsorption process. The ammonia adsorption was found to increase substantially in dry conditions for all the studied materials except PVDF. The increase was largest for plain stainless steel which was the most adsorbing material. The coatings applied on stainless steel decreased the adsorption significantly in dry conditions. Polymers PVDF and PTFE were the least-adsorbing materials. In water amount fractions between 1000 and 10,000 mu mol mol(-1), the ammonia adsorption was at its lowest. The adsorption increased again above 1% humidity levels.
Subject: ATMOSPHERIC AMMONIA
114 Physical sciences
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