TY - EJOU AU - Li, Xing AU - Osaka, Yugo AU - Huang, Hongyu AU - Tsujiguchi, Takuya AU - Kodama, Akio TI - Effect of Doped Alkali Metal Ions on the SO₂ Capture Performance of MnO₂ Desulfurization Materials at Low Temperature T2 - Journal of Renewable Materials PY - 2021 VL - 9 IS - 9 SN - 2164-6341 AB - 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. KW - Sulfur dioxide capture; desulfurization materials; manganese dioxide; alkali metal ions doped DO - 10.32604/jrm.2021.015514