Macroporous Silica with Thick Framework for Steam-Stable and High-Performance Poly(ethyleneimine)/Silica CO2 Adsorbent

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Poly(ethyleneimine) (PEI)/silica has been widely studied as a solid adsorbent for post-combustion CO2 capture. In this work, a highly macroporous silica (MacS), synthesized by secondary sintering of fumed silica, is compared with various mesoporous silicas with different pore structures as a support for PEI. The silicas with large pore diameter and volume enabled high CO2 adsorption kinetics and capacity, because pore occlusion by the supported PEI was minimized. The steam stability of the silica structures increased with the silica wall thickness owing to suppressed framework ripening. The silicas with low steam stability showed rapid leaching of PEI, which indicated that the PEI squeezed out of the collapsed silica pores leached more readily. Consequently, MacS that had an extra-large pore volume (1.80 cm(3)g(-1)) and pore diameter (56.0 nm), and a thick wall (> 10 nm), showed the most promising CO2 adsorption kinetics and capacity as well as steam stability.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-06
Language
English
Article Type
Article
Keywords

CARBON-DIOXIDE CAPTURE; METAL-ORGANIC FRAMEWORKS; TEMPERATURE SWING ADSORPTION; MESOPOROUS MOLECULAR-SIEVE; FLUE-GAS; CO2-INDUCED DEGRADATION; STRUCTURAL-CHANGES; HIGH-CAPACITY; AMBIENT AIR; WIDE-RANGE

Citation

CHEMSUSCHEM, v.10, no.11, pp.2518 - 2526

ISSN
1864-5631
DOI
10.1002/cssc.201700398
URI
http://hdl.handle.net/10203/224722
Appears in Collection
CBE-Journal Papers(저널논문)
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