Kinetic and Thermodynamic Characterization of Enhanced Carbon Dioxide Absorption Process with Lithium Oxide-Containing Ternary Molten Carbonate.
Efficient and high-flux capture of CO2is the prerequisite of its utilization. Static absorption of CO2with solid Li2O and molten salts (Li2O-free and Li2O-containing Li-Na-K carbonates) was investigated using a reactor with in situ pressure monitoring. The absorption capacity of dissolved Li2O was 0.835 molCO2/molLi2Oat 723 K, larger than that of solid Li2O. For the solid Li2O absorbents, formation of solid Li2CO3on the surface can retard the further reactions between Li2O and CO2, whereas the dissociation/dissolution effect of molten carbonate on Li2O improved the mass-specific absorption capacity of liquid Li2O. In Li2O-containing Li-Na-K molten carbonate, CO2was mostly absorbed by alkaline oxide ions (O2-). The chemical interactions between CO2and CO32-contributed to CO2uptake via formation of multiple carbonate ions. The mass transfer of these absorbing ions was found as the dominating factor governing the rate of static absorption. Higher temperatures reduced the thermodynamic tendency of CO2absorption, but a lower viscosity at elevated temperature was conducive to absorption kinetics. Compared with the commonly used CaO absorbent, Li2O was much more dissolvable in molten carbonate. The Li2O-containing molten carbonate is potentially a promising medium for industrial carbon capture and electrochemical transformation process.
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Bowen
B
Deng
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Juanjuan
J
Tang
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Xuhui
X
Mao
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Yuqiao
Y
Song
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Hua
H
Zhu
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Wei
W
Xiao
School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University , 430079 Wuhan, China.
Dihua
D
Wang
D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D013816:Thermodynamics
D002254:Carbonates; D012492:Salts; D002245:Carbon Dioxide; D008094:Lithium