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Affecting mechanism of activation conditions on the performance of NaNO 3 ‐modified dolomite for CO 2 capture
Author(s) -
Yang Xinfang,
Zhao Lifeng,
Xiao Yunhan
Publication year - 2015
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1913
Subject(s) - activation energy , absorption (acoustics) , chemistry , raman spectroscopy , diffusion , nano , analytical chemistry (journal) , chemical engineering , materials science , chromatography , thermodynamics , composite material , optics , physics , engineering
The affecting mechanism of activation conditions on the performance of NaNO 3 ‐modified dolomites for CO 2 capture was conducted combined with the activation tests and the CO 2 absorption tests. The weight loss during activation was determined by the combined effects of the NaNO 3 content, activation temperature, and activation atmosphere, for their combined effects on the ion diffusion. Moreover, the greater weight loss during activation did not elicit a corresponding increase in CO 2 absorption ability of the activated absorbents. CO 2 absorption activity tests indicated that the sample 0.20Na‐dol activated at 500 °C in N 2 showed the best cyclic CO 2 absorption ability. The underlying mechanism was then analyzed based on the results of the Brunauer–Emmett–Teller, X‐ray diffraction, and Raman analysis of the absorbents. The results indicated that the different CO 2 absorption abilities might be due to the two kinds of molecular arrangements between the MgO and CaCO 3 grains obtained during activation. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.