用浸渍法制备了CeO2-ZrO2-La2O3复合氧化物,用XRD,TG-DTA,拉曼光谱、H2-TPR和BET表面积测定等方法对合成的样品进行了表征,研究了在单钯Pd/γ-Al2O3催化剂中添加CeO2-ZrO2-La2O3对催化剂活性和热稳定性的影响.结果表明,在Pd/γ-Al2O3中加入三元复合氧化物有利于提高三效催化剂的热稳定性,有利于阻止γ-Al2O3在高温时的相变以稳定Al2O3结构,防止在高温条件下催化剂表面积的损失.在Pd的负载量为1 g*L-1条件下,测定了Pd/CeO2-ZrO2-La2O3/γ-Al2O3/蜂窝陶瓷催化剂对CO,C3H6和NO净化的三效活性,研究了催化剂的结构和三效催化活性之间的关系.结果表明,CeO2-ZrO2-La2O3的存在能明显提高Pd基催化剂对CO,C3H6和NO的三效净化活性,扩大催化剂的操作窗口,提高在富氧条件下对NOx的还原性能.
参考文献
| [1] | Centi G;Foumasiero P;Graziani M et al.Enhancement of the low temperature activity in NO reduction in lean condition by SMSI effect in Pt/CeO-ZrO2 on alumina catalyst[J].Topics in Catalysis,2001,16/17:173. |
| [2] | Hideaki Muraki;Geng Zhang .Design of automotive exhaust catalysts[J].Catalysis Today,2000,63:337. |
| [3] | Toshiyuki Masui;Teteuya Ozaki;Ken-ichi Machida .Preparation of ceria-zirconia sub-catalysts for automotive exhaust cleaning[J].Journal of Alloys and Compounds,2000,304:49. |
| [4] | Terribile D;Alessandro Trovarelli;Jordi Llorca .The preparation of high surface CeO2-ZrO2 mixed oxides by a surfactant-assisted approach[J].Catalysis Today,1998,43:80. |
| [5] | Hirohumi Shinjoh;Toshitaka Tanabe;Hideo Sobukawa;Masahiro Sugiura .Effect of Ba addition on catalytic activity of Pt and Rh catalysts loaded on #gamma#-alumina[J].Topics in Catalysis,2001(1/4):95-99. |
| [6] | Arena G E;Bianchini A;Centi G et al.Transient surface processes of storage and conversion of NOx[J].Topics in Catalysis,2001,16/17:157. |
| [7] | 钟依均,林瑞,罗孟飞.CuO/Ce-Zr-La-O催化剂的表征及CO氧化活性[J].中国稀土学报,2003(02):226-229. |
| [8] | 桂容;王红霞;刘素琴 .Cu-Mn-Ce/γ-Al2O3汽车尾气净化材料合成及性能研究[J].中国稀土学报,2003,21(06):639. |
| [9] | Shyu J Z;Weber W H;Gandhi H S .Surface charaterization of alumin-supported ceria[J].Journal of Physical Chemistry,1988,92:4964. |
| [10] | 缪建英,蔡俊修.Ce0.5Zr0.5O2固溶体的原位拉曼光谱[J].催化学报,1999(01):25-28. |
| [11] | Fornasiero P.;Rao GR.;Kaspar J.;Meriani S.;Trovarelli A. Graziani M.;Dimonte R. .RH-LOADED CEO2-ZRO2 SOLID SOLUTIONS AS HIGHLY EFFICIENT OXYGEN EXCHANGERS - DEPENDENCE OF THE REDUCTION BEHAVIOR AND THE OXYGEN STORAGE CAPACITY ON THE STRUCTURAL PROPERTIES[J].Journal of Catalysis,1995(1):168-177. |
| [12] | Hui Z.;Nicolas G.;Francoise V.;Michele P. .Preparation and electrical properties of a pyrochlore-related Ce2Zr2O8-x phase[J].Solid state ionics,2003(3/4):317-326. |
| [13] | Yang L;Kresanwahjuesa O;Gorte R J .A calorimetric study of oxygen-storage in Pd/ceria and Pd/ceria-zirconia catalysts[J].Catalysis Letters,2001,72:33. |
| [14] | Juan R;González-velasco;Juan A B et al.Thermal aging of Pd/Pt/Rh automotive catalysts under a cycled oxidizing-reducing environment[J].Catalysis Today,2000,59:395. |
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