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Improving carbon dioxide capture in aqueous ammonia solutions by fine SiO2 particles

Abstract

Ammonia solutions are considered to be effective solvents for carbon dioxide absorption. Despite the numerous advantages of these solvents, their high volatility is a significant technical and economic problem. Therefore, in this work, silica particles were used as additives to improve CO2 absorption and inhibit NH3 desorption. SiO2 microparticles and colloidal SiO2 particles in the concentration range of 0-0.15 wt.% were used in this study. The most favorable mass transport for CO2 absorption was at the concentration of colloidal particles of 0.05 wt.%. Under these conditions, the enhancement in the number of moles of absorbed CO2 was above 30%. However, in solvents containing 0.01 wt.% SiO2 microparticles, the increase in CO2 absorption was about 20%. At the same time, the addition of SiO2 particles significantly reduced the escape of ammonia from the solution. The best improvement was obtained when colloidal SiO2 particles were added, and then NH3 escape was decreased by about 60%. This unfavorable phenomenon was also inhibited in ammonia solutions containing SiO2 microparticles at a concentration of 0.01 wt.%.

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DOI:
Digital Object Identifier (open in new tab) 10.24425/cpe.2023.146718
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Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
Chemical and Process Engineering : New Frontiers no. 44,
ISSN: 0208-6425
Language:
English
Publication year:
2023
Bibliographic description:
Konopacka-Łyskawa D., Amibo T., Dobrzyniewski D., Łapiński M.: Improving carbon dioxide capture in aqueous ammonia solutions by fine SiO2 particles// Chemical and Process Engineering : New Frontiers -Vol. 44,iss. 3 (2023), s.e16-
DOI:
Digital Object Identifier (open in new tab) 10.24425/cpe.2023.146718
Sources of funding:
  • Statutory activity/subsidy
Verified by:
Gdańsk University of Technology

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