In Situ Nuclear Magnetic Resonance Mechanistic Studies of Carbon Dioxide Reactions with Liquid Amines in Aqueous Systems: New Insights on Carbon Capture Reaction Pathways

Autor:	Lisa Saunders Baugh, Michael Siskin, Pavel Kortunov, David C. Calabro
Rok vydání:	2015
Předmět:	In situ Aqueous solution Primary (chemistry) Proton General Chemical Engineering Energy Engineering and Power Technology chemistry.chemical_compound Fuel Technology Nuclear magnetic resonance chemistry Amine gas treating Alkanolamine Absorption (chemistry) Spectroscopy
Zdroj:	Energy & Fuels. 29:5919-5939
ISSN:	1520-5029 0887-0624
Popis:	A series of closely related primary, secondary, and tertiary alkanolamine model compounds were monitored in real time in aqueous solution via in situ nuclear magnetic resonance (NMR) spectroscopy while purging CO2-rich gas through the solution over a range of temperatures. The real-time in situ spectroscopic monitoring of this reaction chemistry provides new insight about reaction pathways through identification of primary products and their transformations into secondary products. New mechanistic pathways were observed and elucidated. The effects of CO2 loadings, relative absorption and desorption kinetics, pH, temperature, and other critical features of the amine/CO2 reaction system are discussed in detail. The effect of amine basicity and structure on these parameters was further elucidated by studying complementary electron-rich and -poor amines (pKa ∼ 4.5–11) and guanidines (pKa ∼ 14–15). While tertiary amines act only as simple proton acceptors, primary and secondary amines function as both bases an...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8b5fb0c442a2f35dbe805a28ff8f0bff https://doi.org/10.1021/acs.energyfuels.5b00850 Zobrazit plný text záznamu