Recent advances in the preparation and catalytic performance of Mn-based oxide catalysts with special morphologies for the removal of air pollutants

Air pollutants cause serious environmental pollution and harm to human health, which has led to air pollution gaining attention. At present, the catalytic oxidation technology is one of the most effective and universal technologies in dealing with air pollutants. The research and development of highly efficient catalysts with low cost is the decisive factor for the wide application of the catalytic oxidation technology. Mn-based oxides with special morphologies have been widely used to eliminate air pollutants owing to their unique physical and chemical properties such as low price, environment-friendliness, and high catalytic activity. In this paper, the preparation of flower-like, rod-like, cubic-like, hollow-like, three-dimensional ordered macropores, and other special Mn-based oxide materials is introduced in detail. The progress in the development of Mn-based catalysts with special morphologies for the removal of nitrogen oxides, soot particles, volatile organic compounds, carbon monoxide, ozone, sulfur dioxide, and other pollutants is summarized in detail. Finally, the existing problems encountered in the use of Mn-based oxide catalysts with special morphologies in the catalytic removal of air pollutants are proposed, and future research and development directions are also discussed.