Thermocatalytic analysis of CO2-CO selective chemisorption mechanism on lithium cuprate (Li2CuO2) and oxygen addition effect

Thermogravimetric and catalytic analyzes were performed on Li2CuO2 in order to evidence selective chemisorption mechanism produced during CO and CO2 capture processes on Li2CuO2, using different atmosphere conditions. CO was always selectively chemisorbed, instead of CO2. Additionally, it was found...

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Bibliographic Details
Published in:Thermochimica acta 2018-02, Vol.660, p.144-151
Main Authors: Yañez-Aulestia, Ana, Gómez-García, J. Francisco, Mendoza-Nieto, J. Arturo, Duan, Yuhua, Pfeiffer, Heriberto
Format: Article
Language:English
Subjects:
CO oxidation
CO2 chemisorption
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Lithium cuprate
Selective sorption process
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Summary:Thermogravimetric and catalytic analyzes were performed on Li2CuO2 in order to evidence selective chemisorption mechanism produced during CO and CO2 capture processes on Li2CuO2, using different atmosphere conditions. CO was always selectively chemisorbed, instead of CO2. Additionally, it was found that O2 modified positively the chemisorption capabilities in all systems studied (CO-O2, CO2-O2 and CO-CO2-O2). [Display omitted] •CO and CO2 selective chemisorption processes on Li2CuO2 were studied.•CO and CO2 chemisorptions occurred through superficial and bulk mechanisms.•CO was always selectively chemisorbed instead of CO2.•Oxygen addition modified positively CO and CO2chemisorption. In the present work, thermogravimetric and catalytic analyses were performed in order to evidence the chemisorption selective mechanism followed during the CO and CO2 chemisorption processes on Li2CuO2 under different atmosphere conditions. Results were contrasted with some thermodynamic data. According to TG results, when the gas flow was composed by one gas (CO or CO2), chemisorption occurred through a superficial reaction followed by a volumetric capture. In the CO case, a double process was produced; CO oxidation and subsequent CO2 chemisorption. Here, Li2CuO2, initially, catalyzed the CO oxidation and then it sorbed CO2. However, as Li2CuO2 structure and composition evolves, it could not be strictly considered as a catalyst. On the other hand, when both gases were present (CO-CO2), a chemisorption competition was observed as a function of temperature, where CO was always selectively chemisorbed. Furthermore, O2 presence modified positively the chemisorption abilities in binary (CO-O2 and CO2-O2) and ternary (CO-CO2-O2) gas systems, in comparison with analogous tests performed in absence of O2.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2017.12.027