Combination of Low- and Medium-Temperature Catalysts for the Selective Catalytic Reduction of NO x with NH 3
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ORIGINAL PAPER
Combination of Low‑ and Medium‑Temperature Catalysts for the Selective Catalytic Reduction of NOx with NH3 Wenpo Shan1,2 · Yang Geng3 · Yan Zhang1,2 · Zhihua Lian1 · Hong He1,4,5
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, we developed a novel combination model for different types of catalysts, which could generate synergistic effects for the catalysts with different functions. A Mn3CeOx catalyst with good low-temperature activity and a Ce0.1TiOx catalyst with good medium and high temperature activities were selected to make the combination and show synergistic effects. The combination of Ce0.1TiOx–Mn3CeOx (with C e0.1TiOx located at the upstream of M n3CeOx) showed high NOx conversions in the whole temperature range, together with relatively low N 2O formation, indicated the synergistic effects between the Ce0.1TiOx and M n3CeOx catalysts. This combination model can be extended widely to various N H3-SCR catalysts and therefore has universal significance. Keywords Selective catalytic reduction · Catalyst combination · Synergistic effects · Nitrogen oxides abatement
1 Introduction Nitrogen oxides (NOx) emissions from diesel vehicles are major source for air pollution problems, such as photochemical pollution and haze. According to the China Mobile Source Environmental Management Annual Report 2019 by the Ministry of Ecology and Environment of the People’s Republic of China, diesel vehicles only account for 9.1% * Hong He [email protected] 1
Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
2
Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo 315800, China
3
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
4
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco‑Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
5
University of Chinese Academy of Sciences, Beijing 100049, China
of the vehicles population, but they emitted 71.2% of the vehicle NOx [1]. Therefore, further control of NOx emissions from diesel vehicles is urgently needed. Compared with the stage IV and V of the diesel vehicle emission standards, both of the standards in Europe and China were substantially tightened in the stage VI. At the same time, the emission control for cold-start is particularly required [2–5]. NH3-SCR is the dominant technology for lean burn NOx control and has been widely applied on diesel vehicles [6, 7]. Catalyst plays the key role for NH3-SCR. Various NH3-SCR catalyst systems with different properties were developed [3, 4, 8]. The V-based catalysts have been widely used for many years and are still the dominant N
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