Abstract
Selective catalytic reduction of NOx with NH3 (NH3-SCR) has been successfully applied to abate NOx from diesel engines and coal-fired industries on a large scale. Although V2O5-WO3(MoO3)/TiO2 catalysts have been utilized in commercial applications, novel vanadia-based catalysts have been recently developed to meet the increasing requirements for low-temperature catalytic activity. In this article, recent progress on the improvement of the low-temperature activity of vanadia-based catalysts is reviewed, including modification with metal oxides and nonmetal elements and the use of novel supports, different synthesis methods, metal vanadates and specific structures. Investigation of the NH3-SCR reaction mechanism, especially at low temperatures, is also emphasized. Finally, for low-temperature NH3-SCR, some suggestions are given regarding the opportunities and challenges of vanadia-based catalysts in future research.
Highlights
Nitrogen oxides (NOx, including NO and NO2 ), primarily emitted from fossil fuel combustion in both stationary and mobile sources, are major pollutants in the atmosphere
Ma et al found that 8 wt.% CeO2 -1 wt.%V2 O5 -WO3 /TiO2 showed higher than 80% catalytic activity at the temperature range of 190–450 ◦ C, comparable to the performance of 3 wt.% V2 O5 -WO3 /TiO2, showing that the usage of toxic vanadium oxides can be reduced via ceria doping in the development of low-temperature SCR catalysts [15]
Xu et al found that among TiO2 -supported vanadium oxide catalysts modified with different amounts of Ce and Sb, V5 Ce35 Sb2 /Ti presented the best SCR performance, over which 90% NO conversion was obtained at 210 ◦ C [23]
Summary
Nitrogen oxides (NOx , including NO and NO2 ), primarily emitted from fossil fuel combustion in both stationary and mobile sources, are major pollutants in the atmosphere. Due to the high operating temperature, the precipitator and and strong SO2 resistance [6]. Due to the high operating temperature, the precipitator and desulfurizer desulfurizer should be installed downstream theinSCR unitplants in power [7]. This units shouldunits be installed downstream of the SCR of unit power [7]. V-based catalysts plants is lower than the working temperature of traditional V-based catalysts [8]. NOx emission limits, the study of novel low-temperature vanadia-based SCR catalysts with high. SCR catalysts iswith highdesirable performance is highly desirable and has attracted broadprocess. Development of vanadia-based catalysts with superior low-temperature SCR activity
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