Open Access

ARTICLE

Effect of Doped Alkali Metal Ions on the SO₂ Capture Performance of MnO₂ Desulfurization Materials at Low Temperature

Xing Li^1,3, Yugo Osaka^2,*, Hongyu Huang¹, Takuya Tsujiguchi², Akio Kodama²

1 Guangzhou Institute of Energy Conversion, Chinese Academy of Science, Guangzhou, 510640, China
2 School of Mechanical Engineering, College of Science and Engineering, Kanazawa University, Kanazawa, 9201192, Japan
3 School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211800, China

* Corresponding Author: Yugo Osaka. Email: -u.ac.jp

(This article belongs to the Special Issue: New Trends in Sustainable Materials for Energy Conversion, CO₂ Capture and Pollution Control)

Journal of Renewable Materials 2021, 9(9), 1541-1553. https://doi.org/10.32604/jrm.2021.015514

Received 24 December 2020; Accepted 27 January 2021; Issue published 23 April 2021

Abstract

Sulfur dioxide (SO₂) emissions from diesel exhaust pose a serious threat to the environment and human health. Thus, desulfurization technology and the performance of desulfurization materials must be improved. In this study, MnO₂ was modified with various alkali metal ions using the impregnation method to enhance its SO₂ capture performance. The composites were characterized intensively by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction spectroscopy, and Brunauer-Emmett-Teller theory. The SO₂ capture performance of these composites were measured via thermogravimetry, and the effect of doping with alkali metal ions on the SO₂ capture performance of MnO₂ was investigated. Results showed that the SO₂ capture performance of MnO₂ could be enhanced by doping with alkali metal ions, and the MnO₂ composite doped with LiOH (2.0 mol/L) had the best SO₂ capture capacity (124 mg_SO2/g_Material), which was 18% higher than that of pure MnO₂. Moreover, the type and concentration of alkali metal ions had varying effects on the SO₂ capture performance of MnO₂. In our experiment, the SO₂ capture performance of the MnO₂ doped with NaOH, LiCl, Na₂CO₃, K₂CO₃, and Li₂CO₃ composites were worse than that of pure MnO₂. Therefore, the influences of the type and concentration of alkali metal ions to be doped into desulfurization materials must be considered comprehensively.

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