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Title: Thermocatalytic analysis of CO 2-CO selective chemisorption mechanism on lithium cuprate (Li 2CuO 2) and oxygen addition effect

In the present paper, thermogravimetric and catalytic analyses were performed in order to evidence the chemisorption selective mechanism followed during the CO and CO 2 chemisorption processes on Li 2CuO 2 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 CO 2), chemisorption occurred through a superficial reaction followed by a volumetric capture. In the CO case, a double process was produced; CO oxidation and subsequent CO 2 chemisorption. Here, Li 2CuO 2, initially, catalyzed the CO oxidation and then it sorbed CO 2. However, as Li 2CuO 2 structure and composition evolves, it could not be strictly considered as a catalyst. On the other hand, when both gases were present (CO-CO 2), a chemisorption competition was observed as a function of temperature, where CO was always selectively chemisorbed. Finally and furthermore, O 2 presence modified positively the chemisorption abilities in binary (CO-O 2 and CO 2-O 2) and ternary (CO-CO 2-O 2) gas systems, in comparison with analogous tests performed in absence of O 2.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. National Autonomous Univ. of Mexico, Mexico City (Mexico). Inst. of Materials Research. Surface Physics and Reactivity Lab. (LaFReS)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Publication Date:
Grant/Contract Number:
251801; IN-101916
Type:
Accepted Manuscript
Journal Name:
Thermochimica Acta
Additional Journal Information:
Journal Volume: 660; Journal ID: ISSN 0040-6031
Publisher:
Elsevier
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); National Autonomous Univ. of Mexico, Mexico City (Mexico)
Sponsoring Org:
USDOE; National Council of Science and Technology (CONACYT) (Mexico); UNAM Support Program for Research Projects and Technological Innovation (PAPIIT) (Mexico)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; CO2 chemisorption; CO oxidation; selective sorption process; lithium cuprate
OSTI Identifier:
1461405