Abstract
Selective catalytic reduction of nitrogen oxides with NH3 (NH3-SCR) is still the most commonly used control technology for nitrogen oxides emission. Specifically, the application of rare earth materials has become more and more extensive. CeO2 was widely developed in NH3-SCR reaction due to its good redox performance, proper surface acidity and abundant resource reserves. Therefore, a large number of papers in the literature have described the research of cerium-based catalysts. This review critically summarized the development of the different components of cerium-based catalysts, and characterized the preparation methods, the catalytic performance and reaction mechanisms of the cerium-based catalysts for NH3-SCR. The purpose of this review is to highlight: (1) the modification effect of the various metal elements for cerium-based catalysts; (2) various synthesis methods of the cerium-based catalysts; and (3) the physicochemical properties of the various catalysts and clarify their relations to catalytic performances, particularly in the presence of SO2 and H2O. Finally, we hope that this work can give timely technical guidance and valuable insights for the applications of NH3-SCR in the field of NOx control.
Highlights
NOx emissions from automobile exhausts and stationary sources pose a serious threat to environment
The catalytic performance of cerium-based catalysts mainly depends on surface acidity, specific surface area, redox performance and resistance to H2O and SO2
The current study indicated the better catalytic performance of cerium-based bimetallic oxides than pure CeO2 in NH3-SCR
Summary
NOx emissions from automobile exhausts and stationary sources pose a serious threat to environment. Many countries have issued a number of laws and measures to strictly control NOx emissions, such as the New Sources Performance Standard of the United States, the Large Combustion Plant Directive: H 2001/80/EC of the European Union, the Air Pollution Prevention Law of Japan, the Atmospheric Environment Preservation Law of South Korea and the Thermal Power Plant of China (GB13223-2011). The V2O5–WO3/TiO2 and V2O5–MoO3/TiO2 commercial catalysts were conventionally developed for NH3-SCR, because of their excellent catalytic performance and strong stability [2,3,4,5]. Non-vanadium-based NH3-SCR catalysts currently attract significantly more attention in this field
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