TY - JOUR
T1 - Regenerable solid molecular basket sorbents for selective SO2 capture from CO2-rich gas streams
AU - AlQahtani, Mohammad S.
AU - Wang, Xiaoxing
AU - Song, Chunshan
N1 - Funding Information:
This work was supported by the Pennsylvania State University . One of the authors (MSQ) gratefully acknowledges the PhD scholarship from Saudi Aramco. We would like to thank the members of Clean Fuels and Catalysis Program in the EMS Energy Institute at Penn State for helpful discussions.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - A series of molecular basket sorbents (MBSs) consisting of SBA-15 loaded with ethylene glycol (EG) derivatives and dimethyl sulfoxide (DMSO) are developed and investigated for sulfur dioxide (SO2) capture from industrial tail gas streams. The EG derivatives and DMSO are successfully immobilized on the support via surface interaction with the silanol groups as evidenced by DRIFTS analysis. The mesoporous structure of SBA-15 is preserved after loading with different compounds, with no major morphology changes. The SO2 sorption capacity increases with decreasing the molecular weight of EG derivatives. Furthermore, changing the terminal group of EG derivatives from hydroxyl (-OH) to methoxy (-OCH3) improves SO2 sorption capacity. DMSO-based MBS exhibits much higher SO2 affinity (64 mg-SO2/g-sorb.) than EG-based sorbents (<25 mg-SO2/g-sorb.). DMSO/SBA-15 sorbents are able to selectively capture SO2 in the presence of high CO2 concentration (30 %) with a relative selectivity factor of 120. Pre-saturating the DMSO-based sorbents with water vapor does not affect SO2 sorption capacity, and the sorbents possess good stability and regenerability. Moreover, the spent DMSO/SBA-15 sorbent could be further applied for H2S removal for producing elemental sulfur via Claus reaction between H2S and the adsorbed SO2, providing an environmentally friendly and sustainable way of regenerating the spent DMSO/SBA-15 sorbents.
AB - A series of molecular basket sorbents (MBSs) consisting of SBA-15 loaded with ethylene glycol (EG) derivatives and dimethyl sulfoxide (DMSO) are developed and investigated for sulfur dioxide (SO2) capture from industrial tail gas streams. The EG derivatives and DMSO are successfully immobilized on the support via surface interaction with the silanol groups as evidenced by DRIFTS analysis. The mesoporous structure of SBA-15 is preserved after loading with different compounds, with no major morphology changes. The SO2 sorption capacity increases with decreasing the molecular weight of EG derivatives. Furthermore, changing the terminal group of EG derivatives from hydroxyl (-OH) to methoxy (-OCH3) improves SO2 sorption capacity. DMSO-based MBS exhibits much higher SO2 affinity (64 mg-SO2/g-sorb.) than EG-based sorbents (<25 mg-SO2/g-sorb.). DMSO/SBA-15 sorbents are able to selectively capture SO2 in the presence of high CO2 concentration (30 %) with a relative selectivity factor of 120. Pre-saturating the DMSO-based sorbents with water vapor does not affect SO2 sorption capacity, and the sorbents possess good stability and regenerability. Moreover, the spent DMSO/SBA-15 sorbent could be further applied for H2S removal for producing elemental sulfur via Claus reaction between H2S and the adsorbed SO2, providing an environmentally friendly and sustainable way of regenerating the spent DMSO/SBA-15 sorbents.
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U2 - 10.1016/j.cattod.2020.07.069
DO - 10.1016/j.cattod.2020.07.069
M3 - Article
AN - SCOPUS:85090124698
SN - 0920-5861
VL - 371
SP - 231
EP - 239
JO - Catalysis Today
JF - Catalysis Today
ER -