Capture of CO2 from ambient air by sodium manganate and CO2 recovery at low temperatures

被引：1

作者：

Yanase, Ikuo ^{[1
]}

Nagashima, Hiroaki ^{[1
]}

Okada, Teppei ^{[1
]}

Kodama, Shohei ^{[1
]}

Takeda, Hiroaki ^{[1
]}

机构：

[1] Saitama Univ, Fac Engn, Dept Appl Chem, 255 Shimoohkubo,Sakura Ku, Saitama 3388570, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2024年 / 187卷

基金：

日本学术振兴会;

关键词：

Sodium manganate; CO2; absorption; Water vapor; Layered structure; Direct air capture; ATR-FTIR; CARBONATE;

D O I：

10.1016/j.jpcs.2024.111866

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Sodium manganate (Na0.66MnO2, NMO) was synthesized by a liquid method using NaOH, Mn(NO3)2, and ethylenediaminetetraacetate. The absorption of CO2 from air by NMO was investigated at room temperature. The CO2 absorption by NMO was promoted at high relative humidity (RH) and accompanied by the formation of birnessite and sodium carbonate hydrate phases. NMO efficiently absorbed CO2 from air when the RH was greater than 60 % because adsorption of water vapor to NMO readily occurred above 60 % RH. Thus, NMO absorbed CO2 together with H2O adsorbed from the air. The regeneration of NMO, was accompanied by the release of CO2 from sodium carbonate hydrates and occurred at temperatures as low as 150 degrees C. This behavior was attributed the similar structural features of NMO and birnessite, which both incorporate layered structures composed of MnO6 octahedra.

引用

页数：6

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