| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Research Progress of Cerium Oxide-based Catalysts for NH3-SCR at Low Temperature |
| LI Na1,2, CHEN Zedong1, WANG Jingjing1, ZHANG Kai1, WU Wenfei1,3
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1 School of Energy and Environment, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, China
2 School of Environmental Science and Engineering, North China Electric Power University, Baoding 071000, Hebei, China
3 Key Laboratory of Efficient and Clean Combustion, Baotou 014010, Inner Mongolia, China |
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Abstract Selective catalytic reduction (SCR) is a mature NOx removal technology for industrial flue gas and diesel exhaust gas. However, it is still a challenge to develop novel low-temperature catalysts for NH3-SCR of NOx, especially at temperatures below 200 ℃. In the past few years, many studies have demonstrated the potential of cerium (Ce)-based catalysts as low-temperature catalysts for NH3-SCR of NOx, it is found that Ce-based catalyst has excellent catalytic performance at low temperature. Herein, the recent progress and performance of Ce-based catalysts for low-temperature NH3-SCR of NOx were summarized. Based on the different roles of ceria in NH3-SCR catalysts, a systematic review of the latest research progress of Ce-based catalysts in the NH3-SCR reaction is performed as the following aspects: ceria-based mixed oxides, Ce-based multi-metal oxide with support, CeO2 used as supports. The catalytic activity and selectivity of Ce-based mixed oxides catalysts are systematically analyzed and summarized in light of some key factors such as activation energy, specific surface area, morphology, crystallinity, preparation method, calcination temperature, other metal dopant/substitute, and redox property of catalysts. For Ce-based multi-metal oxide with support, the main supporter (Al2O3, TiO2 and new type supporter) and the role of supporter in NH3-SCR reaction at low temperature are mainly introduced. Although the NOx removal efficiency of CeO2 as the catalyst carrier is not as high as that of the other two types of catalysts, the catalyst mixed or doped with metal and CeO2 as the common supporter has significantly denitration performance and sulfur-resistant and water-resis-tant performance, which is worthy of further study, as this paper introduces briefly. Subsequently, NH3-SCR mechanisms at low temperature, including E-R and L-H mechanisms, were emphasized. Lastly, the perspective and future directions of low-temperature NH3-SCR of NOx were proposed.
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Published: 25 April 2022
Online: 2022-04-27
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| Fund:Natural Science Foundation of Inner Mongolia Autonomous Region (2018MS02013,2019ZD13) and National Natural Science Foundation of China (51866013). |
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