采用共沉淀法制备了耐高温高比表面积的La2O3-Al2O3 (LA)材料和CeO2-ZrO2-Y2O3 (CZY)储氧材料,并用浸渍法制备了整体式Pd/LA和Pd/CZY汽油车尾气净化三效催化剂,考察了它们的三效催化性能和空燃比性能,并单独通过水煤气变换和CO氧化反应性能的考察,探讨了两种催化剂空燃比窗口扩大的原因.结果表明,Pd/CZY催化剂三效窗口明显较宽,且催化氧化CO的性能明显更优；对于CO+ NO反应,Pd/CZY催化剂的活性较高.当反应中逐步通入O2后,抑制了该反应的进行,但CO氧化的转化率升高,而NO转化率降低,直至CO+ NO反应完全被抑制,表明CO氧化反应对于抑制催化剂在NO贫燃方向的窗口具有一定的作用.另外,Pd/CZY催化剂上对于水煤气变换反应性能明显优于Pd/LA催化剂,在一定温度下逐步通入O2后,不会抑制水煤气变换反应的发生;当逐步通入NO时,可以促进水煤气变换反应的进行,表明Pd/CZY催化剂在富燃时对扩展CO转化窗口的性能明显优于Pd/LA催化剂.
参考文献
| [1] | Lundie D T;McInroy A R;Marshall R;Winfield J M Jones P Dudman C C Parker S F Mitchell C Lennon D .[J].Journal of Physical Chemistry B,2005,109:11592. |
| [2] | 龚茂初,文梅,高士杰,章洁,林之恩,羊彦衡,陈耀强,许清淮,李孝维,郑林.耐高温高表面积氧化铝的制备及性质Ⅱ.La的添加对硫酸铝铵法制高表面Al2O3的影响[J].催化学报,2000(05):404-406. |
| [3] | 龚茂初,文梅,高士杰,章浩,陈耀强,羊彦衡,潘桂黄.高温高表面氧化铝新材料制备的化学研究Ⅰ.硬水铝石法制高表面α-Al2O3[J].天然气化工,2000(01):26-30. |
| [4] | 龚茂初,林之恩,高士杰,章洁,文梅,陈耀强,郑林,许清淮,李孝维.高温高表面氧化铝新材料的制备化学研究[J].燃料化学学报,2001(01):76-79. |
| [5] | Wu X D;Yang B;Weng D .[J].Journal of Alloys and Compounds,2004,376:241. |
| [6] | Ozawa M;Nishio Y .[J].Journal of Alloys and Compounds,2004,374:397. |
| [7] | Nagai Y;Yamamoto T;Tanaka T;Yoshida S Nonaka T Okamoto T Suda A Sugiura M .[J].Catalysis Today,2002,74:225. |
| [8] | Bedrane S;Descorme C;Duprez D .[J].Catalysis Today,2002,75:401. |
| [9] | Kenevey K;Valdivieso F;Soustelle M;Pijolat M .[J].Applied Catalysis B:Environmental,2001,29:93. |
| [10] | Chen LF;Gonzalez G;Wang JA;Norena LE;Toledo A;Castillo S;Moran-Pineda M .Surfactant-controlled synthesis of Pd/Ce0.6Zr0.4O2 catalyst for NO reduction by CO with excess oxygen[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2005(1/4):319-328. |
| [11] | 汪文栋,林培琰,孟明,胡天斗,谢亚宁,刘涛.用Pr修饰的（Ce-Zr）O2固溶体在三效催化剂中的作用[J].中国稀土学报,2002(03):265-269. |
| [12] | He H;Dai H X;Wong K W .[J].Applied Catalysis A:General,2003,251:61. |
| [13] | Bekyarova E;Fornasiero P;Kaspar J;Graziani M .[J].Catalysis Today,1998,45:179. |
| [14] | Hu Z;Wan C Z;Lui Y K;Dettling J Steger J J .[J].Catalysis Today,1996,30:83. |
| [15] | Sadi F;Duprez D;Gerard F;Miloudi A .[J].Journal of Catalysis,2003,213:226. |
| [16] | Liu Z Q;Anderson J A .[J].Journal of Catalysis,2004,224:18. |
| [17] | Jacobs G;Chenu E;Patterson P M;Willioms L Sparks D Thomas G Davis B H .[J].Applied Catalysis A:General,2004,258:203. |
| [18] | Jacobs G;Crawford A;Williams L;Patterson P M Davis B H .[J].Applied Catalysis A:General,2004,267:27. |
| [19] | Hilaire S;Wang X;Luo T;Gorte R J Wagner J .[J].Applied Catalysis A:General,2001,215:271. |
| [20] | Chan S H;Zhu J .[J].Journal of the Institute of Energy,1996,69:144. |
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