Research Progress on the NO Catalytic Oxidation over Manganese Based Multicomponent Oxides
SHI Lu1, ZHANG Jie1, CHEN Rong2, SHEN Meiqing3, SHAN Bin1
1 School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan 430074 2 School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 3 School of Chemical Engineering and Technology, Tianjin University, Tianjin 30072
Abstract: Nitrogen oxides (NOx) are the major pollutant from vehicle exhaust, and they are very harmful to human health and atmospheric environment. With the increasingly strict vehicle exhaust emission standards, the development of more efficient vehicle exhaust catalytic technology has been widely concerned. In vehicle exhaust treatment technology, NO catalytic oxidation to NO2 is an important step, and Pt/Al2O3 is now a commercial used catalyst for NO oxidation. However, as precious metal, Pt is the active ingredient on Pt/Al2O3 for NO catalytic oxidation, its widespread application is limited by its high cost and poor hydrothermal stability. It is of great significance to find catalysts with low price, good hydrothermal stability and excellent NO catalytic oxidation activity in automobile tail gas reprocessing technology. Due to the low price, many transition metal oxide catalysts (especially for MnOx and CoOx) have been studied for NO catalytic oxidation. Although some transition metal oxides have excellent NO catalytic oxidation performance, their hydrothermal stability is not very ideal under actual operating conditions, which limits their practical application. After that, researchers found that the manganese based multicomponent oxides (MBMO), such as perovskite type LaMnO3 and mullite type SmMn2O5, have stable structure, low cost and excellent performance in the catalytic oxidation of NO, attracting more and more attention. The pure phase MBMO showes comparable NO catalytic oxidation activity to commercial Pt/Al2O3, and the researchers further explored diffe-rent methods to improve the catalytic activity of MBMO, including non-stoichiometric ratio synthesis, loading oxide compounds, and doping by heterogeneous elements. These methods can improve the NO catalytic oxidation performance of MBMO while maintaining the original crystal structure and changing the local environment of its surface or interface. While researchers optimized the catalytic activity of NO oxidation, they also paid great attention to the catalytic mechanisms. Combined with infrared spectrum of in situ diffuse reflection Fourier transform infrared spectrometer (in situ DRIFTs), first-principles calculation and micro kinetic analysis, it can have a deeper understanding of the reaction mechanisms, and in turn to guide the optimization of MBMO catalyst in the experiment. This paper mainly introduces the research progress of MBMO on NO catalytic oxidation from the following aspects: (1) development of NO catalytic oxidants; (2) synthesis methods of MBMO; (3) improvement of the catalytic oxidation activity of NO on MBMO; (4) the reaction mec-hanisms of NO catalytic oxidation on MBMO. Finally, the challenges and future prospects of the application of MBMO in the field of NO catalysis are described.
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2019, Vol. 33 
