Effect of moisture on the adsorption of ammonia
| Autor: | Olavi Vaittinen, Stefan Persijn, Markus Metsälä, Daiana Leuenberger, Lauri Halonen, Bernhard Niederhauser |
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| Přispěvatelé: | Department of Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Physics and Astronomy (miscellaneous) General Physics and Astronomy Fraction (chemistry) 01 natural sciences 114 Physical sciences 010309 optics Ammonia chemistry.chemical_compound Adsorption 0103 physical sciences Test tube 0105 earth and related environmental sciences chemistry.chemical_classification Wax Moisture General Engineering Humidity Polymer ATMOSPHERIC AMMONIA 6. Clean water chemistry Chemical engineering 13. Climate action visual_art visual_art.visual_art_medium |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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