High-temperature CO2perm-selectivity of yttrium-doped SDC ceramic-carbonate dual-phase membranes
Por:
Gonzalez-Varela, Daniela, Ovalle-Encinia, Oscar, Gomez-Garcia, J. Francisco, Tavizon, Gustavo, Pfeiffer, Heriberto
Publicada:
1 ene 2021
Resumen:
This work presents the synthesis and evaluation of ceramic supports made of yttrium and samarium co-doped CeO2 (Y-SDC) for synthesizing ceramic-carbonate dual-phase membranes. Their Y : Sm atomic concentration ratio was varied, using a total dopant content of 20 mol%. The Y-SDC supports were characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and electrical conductivity under different atmospheres, for determining the chemical and thermal stability and the intrinsic properties of the ceramic supports. The supports were infiltrated with molten carbonates for making dense dual-phase membranes, and CO2 permeation tests were conducted using a feed gas mixture of CO2/N2 between 700 and 900 °C at 1 bar. This study establishes that Y-SDC supports are thermally and chemically stable at high temperatures in acid environments. The ionic conductivity of Y-SDC depends on the O2 partial pressure and yttrium content. The CO2 permeation flux results of the dense ceramic-carbonate dual-phase membrane are correlated to the ionic conductivity of Y-SDC. Moreover, the CO2 permeation is improved by tailoring the membrane microstructure. © 2021 The Royal Society of Chemistry.
Filiaciones:
Gonzalez-Varela, Daniela:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, CU, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Ovalle-Encinia, Oscar:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, CU, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Gomez-Garcia, J. Francisco:
Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Tavizon, Gustavo:
Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Pfeiffer, Heriberto:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, CU, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Univ Nacl Autonoma Mexico, Lab Fis Quim & React Superficies LaFReS, Inst Invest Mat, Circuito Exterior S-N,CU, Mexico City 04510, DF, Mexico
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