CO₂ Absorption/Release Properties of Lithium Silicate (Li₂SiO₃) Powders Prepared by the Sol-Gel Process

Abstract:

The sol-gel synthesized powder was a single phase Li₂SiO₃. This synthesized powder was reacted with CO₂ at temperatures ranging from the ambient temperature to 511 K, and the products can reverted reversibly to Li₂SiO₃ above 511 K. The degree of absorption was defined as the value obtained by dividing the fractional mass gain of Li₂SiO₃ after absorption by the fractional mass gain corresponding to a 100% reaction. Consequently, the degrees of absorption of the sol-gel synthesized powders were determined to be 9.6%, 13.9%, 16.1% and 20.4% under the absorption condition at 313 K, 333 K, 353 K and 373 K for an exposure time of 115.2 ks, respectively. The specific surface area of synthesized powder was measured as 40 m²/g, higher than that of Li₂SiO₃ synthesized by solid state reaction of 30 m²/g. After CO₂ absorption, the specific surface area of synthesized Li₂SiO₃ was increased with the increase of absorption degree because of the volume expansion. Compared with Li₂SiO₃ synthesized by solid state reaction, Li₂SiO₃ powder synthesized by sol-gel process possessed bigger specific surface areas and higher micro pore volumes. Through the measurement of FE-SEM and BET, the average diameter of micro pores was decreased after CO₂ absorption, because of the generation of Li₂CO₃. The absorption behavior could be best explained by an intraparticle diffusion mechanism, that is, the diffusion of CO₂ gas through the reaction product with an apparent activation energy of 28 kJ∙mol^-1 was a rate-determining step of the absorption reaction.

• Periodical: Applied Mechanics and Materials (Volumes 675-677)
• Pages: 7-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.675-677.7
• Online since: October 2014
• Authors: Fei Wang, Seino Wakou, Shinji Hirai, Toshihiro Kuzuya, Te Li
• Keywords: CO₂ Absorption, Li₂SiO₃, Rate-Determining Process, Sol-Gel Process

References

[1] T. Yasue, Bull. Ceram. Soc. Japan, 37, 962-967(2002).

[2] U. Desideri and A. Paolucci, Energy Conversion & Management, 40, 1899-1915(1999).

[3] A. Duffy, G.M. Walker, Chem. Eng. J., 117, 239～244(2006).

[4] F. Wang, T. Kuzuya and S. Hirai, Materials Transactions, 52, 2211～2215(2011).

[5] K. Nakagawa and T. Ohashi, J. Electrochem. Soc., 145, 1344-1346(1998).

[6] K. Yamauchi, N. Murayama and J. Shibata, Mater. Trans., 48, 2739-2742(2007).

[7] J.Y.S. Lin and J. Ida, Sep. Purif. Technol., 36, 41-51(2004).

[8] K. Nakagawa and T. Ohashi, Chem. Ind., 52, 285-287(1999).

[9] M. Kato and K. Nakagawa, J. Ceram. Soc. Japan, 109, 911-914(2001).

[10] F. Wang, Y. Yoshimura, S. Hirai and T. Kuzuya, Resources Processing, 58, (2011).

[11] K. Masahiro, E. Kenj, Y. Sawako, N. Kazuaki, and U. Hideo, Greenhouse Gas Control Technologies-6th international conference, 1579-1582(2003).

[12] M.E. Bretado, V.G. Velderrain, D.L. Gutierrez, V.C. Martinez, and A.L. Oritz, Catalysis Today, 107-108, 863-867(2005).

[13] B. Yoldas, J. Sol-Gel Sci. Tech., 1, 65-77(1993).

[14] C. Brinker, A. Hurd, P. Schunk, G. Frye and C. Ashley, J. Non-Cryst. solids, 147-148, 424-436(1992).

DOI: 10.1016/s0022-3093(05)80653-2

[15] S. Hirano, T. Yogo, K. Kikuta, Y. Isobe, and S. Ono, J. Mater. Sci., 28, 4188-4192 (1993).

[16] Barin I. and Knacke O., Thermochemical Properties of Inorganic Substances, Verlag Stahleisen m. b.H., Dusseldorf, (1973).

[17] Barin I., Knacke O. and Kubaschewski O., Thermochemical Properties of Inorganic Substances, Supplement, Verlag Stahleisen m. b.H., Dusseldorf, (1977).

DOI: 10.1007/978-3-662-02293-1

[18] S. Hirai, K. Nishinaka, K. Shimakage, U. Motohiro and F. Watari, J. Am. Ceram. Soc., 87, 29-34(2004).

[19] Habashi,F., Principles of Extractive Metallurgy, 1 General Principles, Gordon and Breach Science Publishers Ltd., NY, 111 and 170(1980).

[20] J.Y.S. Lin and J. Ida, Novel Ceramic Membrane for High Temperature Carbon Dioxide Separation, Technical Progress Report (Semi-Annual), DE-FG26-00NT40824, UC, (2001).

[21] F. Wang, T. Kuzuya and S. Hirai, The Scientific world journal, 2014, 1-7(2014).