Recent progress of CeO2-based catalysts with special morphologies applied in air pollutants abatement: A review

The extensive use of fossil fuels in residential and industrial fields has resulted in massive emission of gaseous pollutants, which poses a severe threat to the environment and human health. Consequently, it is critical to develop affordable air cleaning technology, catalytic oxidation is one of the most promising technologies for this purpose. CeO2-based catalysts with special morphologies have aroused widespread attention because of their environmental friendliness, surface binding defects, excellent redox ability, and significant oxygen storage capacity. In addition, the morphologies of these catalysts also modulate the valence state of the element, defect sites, and acid-base properties. Therefore, they have been extensively utilized to reduce air pollutants. In this review, the preparation and application of CeO2-based catalysts with special morphologies, such as hollow, cubic, rod-like, and others, have been summarized, followed by an in-depth examination of the advantages and mechanisms of these catalysts toward eliminating air pollutants. Finally, the challenges associated with the preparation and application of CeO2-based catalysts with special morphologies are presented. We hope to provide some reference for the future design and synthesis of novel CeO2-based catalysts used for the abatement of gas pollutants.