Reaction Engineering, Kinetics, and Catalysis

Analysis of CO2 sorption/desorption kinetic behaviors and reaction mechanisms on Li4SiO4

  1. Zhang Qi*,
  2. Han Daying,
  3. Liu Yang,
  4. Ye Qian,
  5. Zhu Zibin

Article first published online: 13 JUN 2012

DOI: 10.1002/aic.13861

Issue

AIChE Journal

AIChE Journal

Volume 59, Issue 3, pages 901–911, March 2013

Additional Information

How to Cite

Qi, Z., Daying, H., Yang, L., Qian, Y. and Zibin, Z. (2013), Analysis of CO2 sorption/desorption kinetic behaviors and reaction mechanisms on Li4SiO4. AIChE J., 59: 901–911. doi: 10.1002/aic.13861

Author Information

  1. Dept. of Chemical Engineering, East China University of Science and Technology, Shanghai, China

*Correspondence concerning this article should be addressed to Zhang Q. at doraqi@hotmail.com.

Publication History

  1. Issue published online: 20 FEB 2013
  2. Article first published online: 13 JUN 2012
  3. Accepted manuscript online: 30 MAY 2012 10:12AM EST
  4. Manuscript Revised: 24 MAY 2012
  5. Manuscript Received: 3 NOV 2011

Funded by

  • National Natural Science Foundation of China. Grant Number: 21176080
  • Natural Science Foundation of Shanghai. Grant Number: 09ZR1407600
  • Fundamental Research Funds for the Central Universities

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Keywords:

  • CO2 sorption/desorption process;
  • Li4SiO4;
  • kinetic model;
  • steam

The CO2 sorption/desorption kinetic behaviors on Li4SiO4 were analyzed. The theoretical compositions of the sorption/desorption reactions were calculated using FactSage. The sorption/desorption process on Li4SiO4 was investigated by comparing the shrinking core, double exponential, and Avrami–Erofeev models. The Avrami–Erofeev model fits the kinetic thermogravimetric experimental data well and, together with the double-shell mechanism, clearly explains the sorption/desorption mechanism. The sorption process is limited by the rate of the formation and growth of the crystals with double-shell structure consisting of Li2CO3 and Li2SiO3. The whole desorption process is found to be controlled by the rate of the formation and growth of the Li4SiO4 crystals. Furthermore, the influence of steam on the CO2 sorption process was analyzed. It has been observed that the presence of steam enhance the mobility of Li+ and, therefore, the rate of diffusion control stage. © 2012 American Institute of Chemical Engineers AIChE J, 59: 901–911, 2013

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