TY - JOUR
T1 - Treatment of HCl gas by cyclic use of Mg–Al layered double hydroxide intercalated with CO3 2-
AU - Kameda, Tomohito
AU - Tochinai, Masahito
AU - Kumagai, Shogo
AU - Yoshioka, Toshiaki
N1 - Funding Information:
This research was supported by the Environment Research and Technology Development Fund (3K163007) of the Ministry of the Environment, Japan.
Funding Information:
This research was supported by the Environment Research and Technology Development Fund ( 3K163007 ) of the Ministry of the Environment , Japan. Appendix A
Publisher Copyright:
© 2020 Turkish National Committee for Air Pollution Research and Control
PY - 2020/2
Y1 - 2020/2
N2 - Mg–Al layered double hydroxide intercalated with CO3 2− (CO3•Mg–Al LDH) was investigated for treating HCl gas generated from industrial plants. Specifically, we compared the performance of CO3•Mg–Al LDH and highly reactive Ca(OH)2, and they showed approximately the same HCl removal capacity in conventional methods. For HCl gas (300 ppm, linear velocity 1.0 m/min) at 170 °C, the removals by CO3•Mg–Al LDH at Mg/Al = 2.0 and 4.0 were 93.5% and 93.1% after 90 min, respectively, while that by Ca(OH)2 was 93.3%. This indicates that CO3•Mg–Al LDH could be used in place of slaked lime to treat HCl. After the reaction, the CO3•Mg–Al LDH could be regenerated from Cl•Mg–Al LDH in a CO3 2− anion exchange reaction. Finally, we studied the cyclic use of CO3•Mg–Al LDH by combining HCl treatment with regeneration in Na2CO3 solution. At least 3 adsorption-desorption cycles could be carried out for CO3•Mg–Al LDH at Mg/Al = 2.0 and 4.0, with the final performance being 86% and 94% of the initial value, respectively.
AB - Mg–Al layered double hydroxide intercalated with CO3 2− (CO3•Mg–Al LDH) was investigated for treating HCl gas generated from industrial plants. Specifically, we compared the performance of CO3•Mg–Al LDH and highly reactive Ca(OH)2, and they showed approximately the same HCl removal capacity in conventional methods. For HCl gas (300 ppm, linear velocity 1.0 m/min) at 170 °C, the removals by CO3•Mg–Al LDH at Mg/Al = 2.0 and 4.0 were 93.5% and 93.1% after 90 min, respectively, while that by Ca(OH)2 was 93.3%. This indicates that CO3•Mg–Al LDH could be used in place of slaked lime to treat HCl. After the reaction, the CO3•Mg–Al LDH could be regenerated from Cl•Mg–Al LDH in a CO3 2− anion exchange reaction. Finally, we studied the cyclic use of CO3•Mg–Al LDH by combining HCl treatment with regeneration in Na2CO3 solution. At least 3 adsorption-desorption cycles could be carried out for CO3•Mg–Al LDH at Mg/Al = 2.0 and 4.0, with the final performance being 86% and 94% of the initial value, respectively.
KW - CO•Mg–Al layered double hydroxide
KW - Cyclic use
KW - HCl removal
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U2 - 10.1016/j.apr.2019.11.001
DO - 10.1016/j.apr.2019.11.001
M3 - Article
AN - SCOPUS:85075479124
SN - 1309-1042
VL - 11
SP - 290
EP - 295
JO - Atmospheric Pollution Research
JF - Atmospheric Pollution Research
IS - 2
ER -