Abstract
Recently, manganese oxides (MnOx)/cerium(IV) oxide (CeO2) composites have attracted widespread attention for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia (NH3), which exhibit outstanding catalytic performance owing to unique features, such as a large oxygen storage capacity, excellent low-temperature activity, and strong mechanical strength. The intimate contact between the components can effectively accelerate the charge transfer to enhance the electron–hole separation efficiency. Nevertheless, MnOx/CeO2 still reveals some deficiencies in the practical application process because of poor thermal stability, and a low reduction efficiency. Constructing MnOx/CeO2 with other semiconductors is the most effective strategy to further improve catalytic performance. In this article, we discuss progress in the field of MnOx/CeO2-based ternary composites with an emphasis on the SCR of NOx by NH3. Recent progress in their fabrication and application, including suitable examples from the relevant literature, are analyzed and summarized. In addition, the interaction mechanisms between MnOx/CeO2 catalysts and NOx pollutants are comprehensively dissected. Finally, the review provides basic insights into prospects and challenges for the advancement of MnOx/CeO2-based ternary catalysts.
Highlights
Nitrogen oxides (NOx) are mainly generated by human activities, such as automobile exhaust, fossil fuels combustion, and chemical industry emissions, which may induce multiple environmental problems, including acid rain, ozone depletion, and greenhouse effects [1,2,3,4,5,6,7]
manganese oxides (MnOx)/CeO2 composites have been extensively employed as highly efficient catalysts for the reduction of NOx with NH3 because of their unique characteristics, such as their simple synthesis, stable chemical structure, and excellent low temperature efficiency [25,26,27,28,29,30,31]
MnOx/CeO2 composites with hollow structures possess high NOx storage capacity at low temperatures and excellent catalytic performance for the reduction of NOx owing to the large specific surface area, sufficient active sites, and their characteristic confined microenvironment [32,33,34,35,36,37,38,39,40,41,42,43,44]
Summary
Nitrogen oxides (NOx) are mainly generated by human activities, such as automobile exhaust, fossil fuels combustion, and chemical industry emissions, which may induce multiple environmental problems, including acid rain, ozone depletion, and greenhouse effects [1,2,3,4,5,6,7]. MnOx/CeO2 composites with hollow structures possess high NOx storage capacity at low temperatures and excellent catalytic performance for the reduction of NOx owing to the large specific surface area, sufficient active sites, and their characteristic confined microenvironment [32,33,34,35,36,37,38,39,40,41,42,43,44]. Zhang et al [59] prepared MnOx-CeO2/TiO2 ternary catalysts that showed greatly enhanced catalytic activity for removing NOx with NH3 at low temperature compared to single semiconductor materials. Wang et al [60] developed MnOx/CeO2/Al2O3 hybrid composite catalysts that achieved a NOx conversion greater than 90% due to their enhanced pore structure and a large specific surface area. MnOx/CeO2 with hollow structures improved catalytic activity, thereby making it effective at removing contaminants
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