Enhanced CO2 chemisorption at high temperatures via oxygen addition using (Fe, Cu or Ni)-containing sodium cobaltates as solid sorbents
Por:
Vera E., Gómez-García J.F., Pfeiffer H.
Publicada:
1 may 2018
Resumen:
Sodium cobaltates containing Fe, Cu or Ni were synthesized, characterized and evaluated for CO2 capture at high temperatures. Initially, NaCoO2 and metal-containing samples were characterized by XRD, XPS, SEM and N2 adsorption-desorption, where it was probed that Fe, Cu and Ni were partially incorporated into the NaCoO2 structure. All these ceramics were able to trap CO2, but only Fe-containing sample presented an important CO2 chemisorption improvement in comparison to the pristine NaCoO2 sample. Based on these results, a second set of samples was prepared and characterized, varying the iron concentration (10, 20 and 30 mol%). Results showed that CO2 chemisorption was improved by iron addition up to 20 mol%, but higher amounts of iron did not continue enhancing the chemisorption process. Afterwards, the gas flow was modified adding oxygen (PCO2 = 0.95 and PO2 = 0.05), resulting in higher CO2 chemisorption efficiencies and kinetics. These analyses were complemented by CO2 cyclic experiments, where different gas flows were used, analyzing thermal stability and efficiency evolution. © 2018 Elsevier Ltd. All rights reserved.
Filiaciones:
Vera E.:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Cd. Universitaria Del. Coyoacán, Circuito exterior s/n, Ciudad de México, Mexico
Gómez-García J.F.:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Cd. Universitaria Del. Coyoacán, Circuito exterior s/n, Ciudad de México, Mexico
Pfeiffer H.:
Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Cd. Universitaria Del. Coyoacán, Circuito exterior s/n, Ciudad de México, Mexico
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