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Sulfur dioxide (SO 2 ) 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, MnO 2  was modified with various alkali metal ions using the impregnation method to enhance its SO 2  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 SO 2  capture performance of these composites were measured via thermogravimetry, and the effect of doping with alkali metal ions on the SO 2  capture performance of MnO 2  was investigated. Results showed that the SO 2  capture performance of MnO 2  could be enhanced by doping with alkali metal ions, and the MnO 2  composite doped with LiOH (2.0 mol/L) had the best SO 2  capture capacity (124 mg SO2 /g Material ), which was 18% higher than that of pure MnO 2 . Moreover, the type and concentration of alkali metal ions had varying effects on the SO 2  capture performance of MnO 2 . In our experiment, the SO 2  capture performance of the MnO 2  doped with NaOH, LiCl, Na 2 CO 3 , K 2 CO 3 , and Li 2 CO 3  composites were worse than that of pure MnO 2 . Therefore, the influences of the type and concentration of alkali metal ions to be doped into desulfurization materials must be considered comprehensively.

Effect of Doped Alkali Metal Ions on the SO 2 Capture Performance of MnO 2 Desulfurization Materials at Low Temperature