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Title: Bifunctional application of lithium ferrites (Li 5FeO 4 and LiFeO 2) during carbon monoxide (CO) oxidation and chemisorption processes. A catalytic, thermogravimetric and theoretical analysis

Abstract

The CO oxidation and subsequent CO 2 chemisorption processes were evaluated using two lithium ferrites, Li 5FeO 4 and LiFeO 2, as possible catalytic and captor materials. The analysis of the bifunctional process was dynamic and isothermally evaluated using catalytic and thermogravimetric techniques, while solid final products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). These experiments were performed using a CO-O 2 mixture or only CO as gas flows. In addition, different ab initio thermodynamic calculations were performed to elucidate the theoretical viability of these processes. Thermogravimetric and catalytic results clearly showed that both lithium ferrites were able to perform the CO oxidation and CO 2 chemical capture. The efficiency and reaction mechanism varied as a function of the lithium ferrite (Li 5FeO 4 or LiFeO 2), gas mixture and temperature. As it would be expected, Li 5FeO 4 sample presented better chemisorption properties than LiFeO 2, regardless the gas mixture employed (CO or CO+O 2). Moreover, catalytic tests showed that the reaction process was produced even in the oxygen absence. Here, in such a case, both lithium ferrites released the oxygen necessary for the oxidation process with a consequent iron reduction,more » as it was observed by XRD. Based on the obtained experimental and theoretical results, reaction mechanisms were proposed for each lithium ferrite into this bifunctional process. Finally, the best catalytic behavior was obtained with the Li 5FeO 4-CO-O 2 system, where high CO conversions (50–75%) were observed between 500–650 °C and T > 800 °C. Also according to TGA results, this system at T > 700 °C presented the highest ability for capture the CO 2 previously formed during the CO oxidation process (~45%).« less

Authors:
 [1];  [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico). Inst. de Investigaciones en Materiales, Lab. de Fisicoquímica y Reactividad de Superficies (LaFReS)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1395539
Report Number(s):
NETL-PUB-21286
Journal ID: ISSN 1385-8947; PII: S1385894717310835
Resource Type:
Accepted Manuscript
Journal Name:
Chemical Engineering Journal
Additional Journal Information:
Journal Volume: 327; Journal Issue: C; Journal ID: ISSN 1385-8947
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 08 HYDROGEN; 36 MATERIALS SCIENCE; Li5FeO4; LiFeO2 sorbents; CO Oxidation; CO2 capture; Thermogravimetric Analysis; ab initio thermodynamics; CO2 chemisorption; Lithium ferrites

Citation Formats

Lara-García, Hugo A., Vera, Elizabeth, Mendoza-Nieto, J. Arturo, Gómez-García, J. Francisco, Duan, Yuhua, and Pfeiffer, Heriberto. Bifunctional application of lithium ferrites (Li5FeO4 and LiFeO2) during carbon monoxide (CO) oxidation and chemisorption processes. A catalytic, thermogravimetric and theoretical analysis. United States: N. p., 2017. Web. doi:10.1016/j.cej.2017.06.135.
Lara-García, Hugo A., Vera, Elizabeth, Mendoza-Nieto, J. Arturo, Gómez-García, J. Francisco, Duan, Yuhua, & Pfeiffer, Heriberto. Bifunctional application of lithium ferrites (Li5FeO4 and LiFeO2) during carbon monoxide (CO) oxidation and chemisorption processes. A catalytic, thermogravimetric and theoretical analysis. United States. doi:10.1016/j.cej.2017.06.135.
Lara-García, Hugo A., Vera, Elizabeth, Mendoza-Nieto, J. Arturo, Gómez-García, J. Francisco, Duan, Yuhua, and Pfeiffer, Heriberto. Sat . "Bifunctional application of lithium ferrites (Li5FeO4 and LiFeO2) during carbon monoxide (CO) oxidation and chemisorption processes. A catalytic, thermogravimetric and theoretical analysis". United States. doi:10.1016/j.cej.2017.06.135. https://www.osti.gov/servlets/purl/1395539.
@article{osti_1395539,
title = {Bifunctional application of lithium ferrites (Li5FeO4 and LiFeO2) during carbon monoxide (CO) oxidation and chemisorption processes. A catalytic, thermogravimetric and theoretical analysis},
author = {Lara-García, Hugo A. and Vera, Elizabeth and Mendoza-Nieto, J. Arturo and Gómez-García, J. Francisco and Duan, Yuhua and Pfeiffer, Heriberto},
abstractNote = {The CO oxidation and subsequent CO2 chemisorption processes were evaluated using two lithium ferrites, Li5FeO4 and LiFeO2, as possible catalytic and captor materials. The analysis of the bifunctional process was dynamic and isothermally evaluated using catalytic and thermogravimetric techniques, while solid final products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). These experiments were performed using a CO-O2 mixture or only CO as gas flows. In addition, different ab initio thermodynamic calculations were performed to elucidate the theoretical viability of these processes. Thermogravimetric and catalytic results clearly showed that both lithium ferrites were able to perform the CO oxidation and CO2 chemical capture. The efficiency and reaction mechanism varied as a function of the lithium ferrite (Li5FeO4 or LiFeO2), gas mixture and temperature. As it would be expected, Li5FeO4 sample presented better chemisorption properties than LiFeO2, regardless the gas mixture employed (CO or CO+O2). Moreover, catalytic tests showed that the reaction process was produced even in the oxygen absence. Here, in such a case, both lithium ferrites released the oxygen necessary for the oxidation process with a consequent iron reduction, as it was observed by XRD. Based on the obtained experimental and theoretical results, reaction mechanisms were proposed for each lithium ferrite into this bifunctional process. Finally, the best catalytic behavior was obtained with the Li5FeO4-CO-O2 system, where high CO conversions (50–75%) were observed between 500–650 °C and T > 800 °C. Also according to TGA results, this system at T > 700 °C presented the highest ability for capture the CO2 previously formed during the CO oxidation process (~45%).},
doi = {10.1016/j.cej.2017.06.135},
journal = {Chemical Engineering Journal},
number = C,
volume = 327,
place = {United States},
year = {2017},
month = {6}
}

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