Synthesis and evaluation as CO2 chemisorbent of the Li5(Al1-xFex)O4 solid solution materials:Effect of oxygen addition

doi:10.1016/j.jechem.2017.08.002

能源化学(英文) ›› 2017, Vol. 26 ›› Issue (5): 948-955.DOI: 10.1016/j.jechem.2017.08.002

Synthesis and evaluation as CO₂ chemisorbent of the Li₅(Al_1-xFe_x)O₄ solid solution materials:Effect of oxygen addition

Paulina Olavarría, Elizabeth Vera, Enrique J. Lima, Heriberto Pfeiffer

Laboratorio de Fisicoquímica y Reactividad de Superficies(LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Circuito exterior s/n, Cd. Universitaria, Del. Coyoacan C. P. 04510, Ciudad de México, Mexico

收稿日期:2017-05-24 修回日期:2017-08-02 出版日期:2017-09-15 发布日期:2017-11-10
通讯作者: Heriberto Pfeiffer,E-mail addresses:pfeifferperea@gmail.com,pfeiffer@iim.unam.mx
基金资助:
This work was financially supported by the Project SENERCONACYT (251801). P. Olavarria and E. Vera thank to CONACYT for financial support through the CONACYT-SNI research assistant system and PNPC-CONACYT, respectively. Authors thank to A. Tejeda, O. Novelo and J. Romero for technical help.

Synthesis and evaluation as CO₂ chemisorbent of the Li₅(Al_1-xFe_x)O₄ solid solution materials:Effect of oxygen addition

Paulina Olavarría, Elizabeth Vera, Enrique J. Lima, Heriberto Pfeiffer

Laboratorio de Fisicoquímica y Reactividad de Superficies(LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Circuito exterior s/n, Cd. Universitaria, Del. Coyoacan C. P. 04510, Ciudad de México, Mexico

Received:2017-05-24 Revised:2017-08-02 Online:2017-09-15 Published:2017-11-10
Contact: Heriberto Pfeiffer,E-mail addresses:pfeifferperea@gmail.com,pfeiffer@iim.unam.mx
Supported by:
This work was financially supported by the Project SENERCONACYT (251801). P. Olavarria and E. Vera thank to CONACYT for financial support through the CONACYT-SNI research assistant system and PNPC-CONACYT, respectively. Authors thank to A. Tejeda, O. Novelo and J. Romero for technical help.

摘要/Abstract

摘要： Pentalithium aluminate (β-Li₅AlO₄) and the corresponding iron-containing solid solution (Li₅(Al_1-xFe_x)O₄) were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, N₂ adsorption-desorption and temperature-programmed desorption of CO₂. Results showed that 30 mol% of iron can be incorporated into the β-Li₅AlO₄ crystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li₅(Al_1-xFe_x)O₄ samples chemisorbed CO₂ between 200 and 700℃, where the superficial chemisorption presented the highest enhancement, in comparison to β-Li₅AlO₄. Additionally, Li₅(Al_1-xFe_x)O₄ samples sintered at higher temperatures than β-Li₅AlO₄. Isothermal CO₂ chemisorption experiments of β-Li₅AlO₄ and Li₅(Al_1-xFe_x)O₄ were fitted to a first order reaction model, corroborating that iron enhances the CO₂ chemisorption, kinetically. When oxygen was added to the gas flow, CO₂ chemisorption process was mainly enhanced between 400 and 600℃ for the Li₅(Al_0.8Fe_0.2)O₄ sample in comparison to β-Li₅AlO₄. Hence, Li₅(Al_1-xFe_x)O₄ solid solution presented an enhanced CO₂ chemisorption process, in the presence and absence of oxygen, in comparison to β-Li₅AlO₄.

关键词: Lithium aluminate, CO₂ chemisorption, Solid solution, Thermogravimetry

Abstract: Pentalithium aluminate (β-Li₅AlO₄) and the corresponding iron-containing solid solution (Li₅(Al_1-xFe_x)O₄) were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, N₂ adsorption-desorption and temperature-programmed desorption of CO₂. Results showed that 30 mol% of iron can be incorporated into the β-Li₅AlO₄ crystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li₅(Al_1-xFe_x)O₄ samples chemisorbed CO₂ between 200 and 700℃, where the superficial chemisorption presented the highest enhancement, in comparison to β-Li₅AlO₄. Additionally, Li₅(Al_1-xFe_x)O₄ samples sintered at higher temperatures than β-Li₅AlO₄. Isothermal CO₂ chemisorption experiments of β-Li₅AlO₄ and Li₅(Al_1-xFe_x)O₄ were fitted to a first order reaction model, corroborating that iron enhances the CO₂ chemisorption, kinetically. When oxygen was added to the gas flow, CO₂ chemisorption process was mainly enhanced between 400 and 600℃ for the Li₅(Al_0.8Fe_0.2)O₄ sample in comparison to β-Li₅AlO₄. Hence, Li₅(Al_1-xFe_x)O₄ solid solution presented an enhanced CO₂ chemisorption process, in the presence and absence of oxygen, in comparison to β-Li₅AlO₄.

Key words: Lithium aluminate, CO₂ chemisorption, Solid solution, Thermogravimetry

Paulina Olavarría, Elizabeth Vera, Enrique J. Lima, Heriberto Pfeiffer. Synthesis and evaluation as CO₂ chemisorbent of the Li₅(Al_1-xFe_x)O₄ solid solution materials:Effect of oxygen addition[J]. 能源化学(英文), 2017, 26(5): 948-955.

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Synthesis and evaluation as CO₂ chemisorbent of the Li₅(Al_1-xFe_x)O₄ solid solution materials:Effect of oxygen addition

Synthesis and evaluation as CO₂ chemisorbent of the Li₅(Al_1-xFe_x)O₄ solid solution materials:Effect of oxygen addition

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