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Kinetics and mechanism of low‐concentration CO 2 adsorption on solid amine in a humid confined space
Author(s) -
Si Wenting,
Ye Sha,
Zhang Dongxiao,
Yang Bin,
Hou Yang,
Li Zhongjian,
Zhang Xingwang,
Zhu Jingke,
Lei Lecheng
Publication year - 2019
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23257
Subject(s) - adsorption , polyethylenimine , chemistry , kinetics , activation energy , bicarbonate , amine gas treating , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , physics , transfection , biochemistry , quantum mechanics , gene
The kinetics and mechanism of low‐concentration CO 2 adsorption on a solid‐supported polyethylenimine (PEI) adsorbent in a humid confined space were investigated, where the content of CO 2 was about 0.4 % (v). A flow system, equipped with a dew point meter and IR gas analyzer connected in series for online measurement, was developed and the co‐adsorption performance of CO 2 and H 2 O was analyzed. It was found that the H 2 O adsorption capacity and activation energy were not significantly changed when 0.4 % (v) CO 2 was applied in the co‐adsorption process, indicating that the effect of dilute CO 2 could be neglected. However, the CO 2 adsorption capacity increased with the assistance of H 2 O, and then it decreased slightly when the H 2 O content in air flow was above 1.56 % (v). This implied that the adsorption activation energy of CO 2 could be significantly reduced due to the existence of H 2 O in air flow. The direct formation of bicarbonate on the supported PEI adsorbent was favoured for the co‐adsorption process of CO 2 and H 2 O.