能源化学(英文) ›› 2017, Vol. 26 ›› Issue (5): 919-926.DOI: 10.1016/j.jechem.2017.05.008

• ARTICLES • 上一篇    下一篇

Thermokinetic and conductivity analyzes of the high CO2 chemisorption on Li5AlO4 and alkaline carbonate impregnated Li5AlO4 samples:Effects produced by the use of CO2 partial pressures and oxygen addition

Pedro Sánchez-Camacho, J. Francisco Gómez-García, Heriberto Pfeiffer   

  1. 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 Mexico, Mexico
  • 收稿日期:2017-03-22 修回日期:2017-05-22 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 projects PAPⅡTUNAM (IN-101916) and SENER-CONACYT (251801). Authors thank to Adriana Tejeda for technical assistance. PSC and JFGG thank to CONACYT and DGAPA-UNAM for financial support.

Thermokinetic and conductivity analyzes of the high CO2 chemisorption on Li5AlO4 and alkaline carbonate impregnated Li5AlO4 samples:Effects produced by the use of CO2 partial pressures and oxygen addition

Pedro Sánchez-Camacho, J. Francisco Gómez-García, Heriberto Pfeiffer   

  1. 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 Mexico, Mexico
  • Received:2017-03-22 Revised:2017-05-22 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 projects PAPⅡTUNAM (IN-101916) and SENER-CONACYT (251801). Authors thank to Adriana Tejeda for technical assistance. PSC and JFGG thank to CONACYT and DGAPA-UNAM for financial support.

摘要: The effect of CO2 partial pressure was evaluated during the CO2 chemisorption in penta lithium aluminate (Li5AlO4), using different CO2 and O2 partial pressures in the presence or absence of alkaline carbonates. Results showed that using low PO2 (0.1) did not affect the kinetic and final CO2 chemisorption process. Moreover, small additions of oxygen (PO2=0.05) into the mixture flue gas, seemed to increase the CO2 chemisorption. Additionally, the presence of alkaline carbonates modified the CO2 capture temperature range. CO2 chemisorption kinetic parameters were determined assuming a double exponential model where direct CO2 chemisorption and CO2 chemisorption controlled by diffusion processes are considered. Finally, ionic diffusion was analyzed by ionic conduction analysis, where all the gravimetric and ionic measurements were in good agreement showing different diffusion processes depending on temperature. Finally, the oxygen and alkaline carbonate additions have positive effects during the CO2 chemisorption process in Li5AlO4, and a possible reaction mechanism is presented.

关键词: CO2 capture, Thermogravimetric analysis, Partial pressure, Ionic conduction

Abstract: The effect of CO2 partial pressure was evaluated during the CO2 chemisorption in penta lithium aluminate (Li5AlO4), using different CO2 and O2 partial pressures in the presence or absence of alkaline carbonates. Results showed that using low PO2 (0.1) did not affect the kinetic and final CO2 chemisorption process. Moreover, small additions of oxygen (PO2=0.05) into the mixture flue gas, seemed to increase the CO2 chemisorption. Additionally, the presence of alkaline carbonates modified the CO2 capture temperature range. CO2 chemisorption kinetic parameters were determined assuming a double exponential model where direct CO2 chemisorption and CO2 chemisorption controlled by diffusion processes are considered. Finally, ionic diffusion was analyzed by ionic conduction analysis, where all the gravimetric and ionic measurements were in good agreement showing different diffusion processes depending on temperature. Finally, the oxygen and alkaline carbonate additions have positive effects during the CO2 chemisorption process in Li5AlO4, and a possible reaction mechanism is presented.

Key words: CO2 capture, Thermogravimetric analysis, Partial pressure, Ionic conduction