Na/K Binary Synergetic Effect in Lithium Orthosilicate for Enhancing High-Temperature CO2 Capture

Title:Na/K Binary Synergetic Effect in Lithium Orthosilicate for Enhancing High-Temperature CO2 Capture

Volume: 2 Issue: 2

Author(s): Qi Feng, Xin Xu, Xianfei Zeng, Guoqiang Lv, Jianxin Deng, Wenhui Ma and Yang Zhou

Affiliation:

Keywords: Citric acid-assisted sol-gel, CO₂ capture, heterogeneous catalysis, lithium orthosilicate, Na/K doping, synergetic effect.

Abstract: Binary liquid doping of Na/K with various molar ratios into lithium orthosilicate (Li3.92NaxKySiO4) were synthesized by citric acid-assisted sol-gel methods. The CO₂ sorption capacity of Li_3.92Na_xKySiO₄ was investigated by TG analysis under a gas stream containing 50% CO2 and 50% N2 in a wide range from room temperature to 900 0C. Results indicated the sorption of CO₂ for the different Na/K doping lithium orthosilicate occurred between 480-700 0C and the maximum sorption of CO2 was obtained at approximately 700 0C. The optimum ratio of binary doping of Na/K into lithium orthosilicate was determined to be 1:1 (Li_3.92Na_0.04K_0.04SiO₄) and the maximum sorption of CO₂ may attain up to 30.7% (g/g) under the condition of optimum Na/K doping ratio, implying synergetic enhancement effect of Na and K elements on doping vacancies into the Li4SiO4 lattice may enhance the CO₂ sorption capacity.

Cite this article as:

Feng Qi, Xu Xin, Zeng Xianfei, Lv Guoqiang, Deng Jianxin, Ma Wenhui and Zhou Yang, Na/K Binary Synergetic Effect in Lithium Orthosilicate for Enhancing High-Temperature CO2 Capture, Current Environmental Engineering 2015; 2 (2) . https://dx.doi.org/10.2174/221271780202160122203205

DOI https://dx.doi.org/10.2174/221271780202160122203205	Print ISSN 2212-7178
Publisher Name Bentham Science Publisher	Online ISSN 2212-7186