本文通过浸渍法制备了V2O5/TiO2系列筛选催化剂及V2O5/WO3/TiO2负载型催化剂,并在模拟评价装置上考察了上述催化剂在SCR反应巾的催化性能.结果表明,V2O5在涂材料中应该低于3wt.%;钒系催化剂对NOx的净化效率随反应温度的升高,先增加而后减小,存在一个适宜反应温度窗口;随反应温度升高, NH3泄漏量逐渐降低,在温度达到350°C之后,NH3泄漏世不再随温度的升高而变化;SCR反应温度较低时HC和CO浓度基本不变,但从450°C开始,HC浓度逐渐降低,而CO浓度则急剧升高;随NOx/NH3比例增加,NOx转化效率逐渐降低.
参考文献
[1] | Loannis G;Par G;Keld J et al.Urea-SCR Catalyst System Selection for Fuel and PM Optimized Engines and a Demonstration of a Novel Urea Injection System[SAE Paper,2002-01-0289][R].,2002. |
[2] | Gieshoff J;Schafer-Sindlinger A;Spurk P C et al.Improved SCR System for Heavy Duty Applications[SAE Paper,2000-01-0189][R].,2000. |
[3] | Nicole F;Wieland M;Juergen Z et al.On-road demonstration of NOx Emission Control for Diesel Trucks with SINOx Urea SCR System[SAE Paper,1999-01-0111][R].,1999. |
[4] | James A;Geehant M .Diesel Engines Have a Future and that Future is Clean[SAE Paper,2004-01-1956][R].,2004. |
[5] | Cornelis H;Ruud P V;Heaton D M et al.Development of a Urea DeNOx Catalyst Concept for European UltraLow Emission Heavy-Duty Diesel Engines[SAE Paper,952652][R].,1995. |
[6] | Koebel M;Elsener M;Kleemann M .Urea-SCR:a Promising Technique to Reduce NOx Emissions from Automotive Diesel Engines[J].Catalysis Today,2000,24:335-345. |
[7] | Luis J A;Francesco B;Guido B et al.Characterization and Composition of Commercial V2O5-WO3-TiO2 SCR Catalysts[J].Applied Catalysis B:Environmental,1996,10:299-311. |
[8] | Centi G;Nigro G;Perathoner S et al.Role of the Support and of Adsorbed Species on the Behavior of Cu-Based Catalysts for NO Conversion[J].Catalysis Today,1993,17:150-166. |
[9] | Madia G;Elsener M;Koebel M et al.Thermal Stability of Vanadia-Tungsta-Titania Catalysts in the SCR Process[J].Applied Catalysis B:Environmental,2002,39:181-190. |
[10] | 王建华,高翔,阎志勇,骆仲泱,倪明江.以多孔陶瓷为载体的V2O5-WO3-SiO2/TiO2催化剂上NH3选择性催化还原NO的实验研究[J].能源工程,2005(01):11-15. |
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