CO2 chemisorption and evidence of the CO oxidation-chemisorption mechanisms on sodium cobaltate

被引：21
作者：
Vera, Elizabeth [1 ]
Alcantar-Vazquez, Brenda [1 ]
Pfeiffer, Heriberto [1 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
来源：
CHEMICAL ENGINEERING JOURNAL | 2015年 / 271卷
关键词：
CO oxidation; CO2; chemisorption; Sodium cobaltate; Thermal analysis; ELECTROCHEMICAL PROPERTIES; LI4SIO4-BASED SORBENTS; HYDROGEN-PRODUCTION; CARBON-MONOXIDE; IGNITION ROUTE; CRYSTAL-GROWTH; CAPTURE; CATALYSTS; DIOXIDE; NAXCOO2;
D O I：
10.1016/j.cej.2015.02.075
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Sodium cobaltate was synthesized, characterized (structural and microstructural) and evaluated for CO2 and CO captures. The CO capture was produced via a double reaction mechanism oxidation-chemisorpdon process. The sample structure and composition were studied using the XRD and atomic absorption techniques, which indicated a Na0.89CoO1.95 composition. This ceramic is able to chemically trap CO2, which results in carbonation products such as Na2CO3 and different cobalt oxides. Cobalt was chemically reduced as a function of the carbonation temperature. The Na0.89CoO1.95-CO2 reaction kinetic parameters were determined assuming a first-order reaction. The kinetic constants tend to increase as a function of temperature, and two different Delta H-double dagger values were determined. On the other hand, the Na0.89CoO1.95-CO oxidation and subsequent chemisorption processes were analyzed. CO can be oxidized on sodium cobaltate and chemically trapped above 160 degrees C (total conversion was obtained at 490 degrees C). (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：106 / 113
页数：8
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