TY - JOUR
T1 - Evaluation of reaction kinetics of CO2 and Li4SiO4 by thermogravimetry under various CO2 partial pressures
AU - Kaniwa, Shingo
AU - Yoshino, Masatoshi
AU - Niwa, Eiki
AU - Hashimoto, Takuya
N1 - Funding Information:
The authors acknowledge Prof. K. Oh-ishi (Chuo University) and Prof. K. Sasaki (Hirosaki University) for advices to prepare single phase Li 4 SiO 4 . This work was partly supported by JSPS KAKENHI Grant Number JP16K05886 .
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1
Y1 - 2018/1
N2 - The CO2 absorption kinetics of Li4SiO4, which attracted interest as CO2 absorbent, under P(CO2) of 1.0, 0.1 and 0.03 bar was evaluated using thermogravimetry at fixed temperatures between 460 °C and 600 °C. Reaction rate and saturated reaction ratio increased with increasing temperature and P(CO2). Under P(CO2) of 1.0 bar and 0.1 bar, reaction rate at initial period was enhanced by decreasing particle size and variation of reaction ratio by time could be successfully explained by using Jander model assuming Li+ diffusion process induced by difference of CO2 concentration as rate determining step. Under P(CO2) of 0.03 bar, Jander model assuming superficial reaction between CO2 gas and Li4SiO4 solid surface as rate determining step was more applicable, indicating change of rate determining step varied from diffusion process to superficial one by decreasing P(CO2) from 0.1 bar to 0.03 bar.
AB - The CO2 absorption kinetics of Li4SiO4, which attracted interest as CO2 absorbent, under P(CO2) of 1.0, 0.1 and 0.03 bar was evaluated using thermogravimetry at fixed temperatures between 460 °C and 600 °C. Reaction rate and saturated reaction ratio increased with increasing temperature and P(CO2). Under P(CO2) of 1.0 bar and 0.1 bar, reaction rate at initial period was enhanced by decreasing particle size and variation of reaction ratio by time could be successfully explained by using Jander model assuming Li+ diffusion process induced by difference of CO2 concentration as rate determining step. Under P(CO2) of 0.03 bar, Jander model assuming superficial reaction between CO2 gas and Li4SiO4 solid surface as rate determining step was more applicable, indicating change of rate determining step varied from diffusion process to superficial one by decreasing P(CO2) from 0.1 bar to 0.03 bar.
UR - http://www.scopus.com/inward/record.url?scp=85028511844&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028511844&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2017.08.045
DO - 10.1016/j.materresbull.2017.08.045
M3 - Article
AN - SCOPUS:85028511844
SN - 0025-5408
VL - 97
SP - 56
EP - 60
JO - Materials Research Bulletin
JF - Materials Research Bulletin
ER -