采用CeO2和La2O3的不同加入方式,制备了一系列以CeO2和La2O3为助剂的低贵金属含量三效催化剂.用XRD和XPS对其结构进行了表征,并进行了孔结构测定.测试了样品上CO,C3H6和NOx三效转化的温度-转化率曲线和S值-转化率曲线.结果表明:以机械混合加入CeO2和La2O3的样品抗烧结性能差,老化后在s≤1区的NOx和C3H6转化率明显下降,但起燃温度并不高;以硝酸盐水溶液浸渍法加入CeO2和La2O3的样品,Ce与La在样品表面均能高分散,并可进入载体γ-Al2O3内孔,均匀地分布在样品的内外表面,具有良好的抗烧结性能;以La2O3粉和浸渍法加入CeO2的样品,分散度也较高,这两种样品老化后在S≤1区的NOx转化率较高,后者的NOx转化的窗口宽度优于其它样品,催化性能也优于其它样品.对催化剂老化前后的结构和三效活性进行了关联和初步讨论.
参考文献
| [1] | Fisher G B;Theis J R;Casarella M V.[J].SAE Technical Paper,1993:931034. |
| [2] | Oh S H .[J].Journal of Catalysis,1990,124(02):477. |
| [3] | Herz R K;Sell J A .[J].Journal of Catalysis,1985,94(01):166. |
| [4] | Diwell A F;Rajaram R R;Shaw H A et al.[J].Studies in Surface Science and Catalysis,1991,71:139. |
| [5] | Gandhi H S;Shelef M .[J].Studies in Surface Science and Catalysis,1987,30:199. |
| [6] | Ismagilov Z R;Shkrabina R A;Koryabkina N A et al.[J].Catalysis Today,1995,24(03):269. |
| [7] | Ozawa M;Kimura M .[J].Journal of Materials Science Letters,1990,9(03):291. |
| [8] | Morterra C;Magnacca G;Bolis V et al.[J].Studies in Surface Science and Catalysis,1995,96:361. |
| [9] | Miyoshi N;Matsumoto S;Ozawa M.[J].SAE Technical Paper,1989:891970. |
| [10] | Kubsh J E;Rieck J S;Spencer N D .[J].Studies in Surface Science and Catalysis,1991,71:125. |
| [11] | LoofP;KasemoB;Bjomkvist;etal .[J].Studies in Surface Science and Catalysis,1991,71:253. |
| [12] | SerreC;GarinF;Belot G et al.[J].Journal of Catalysis,1993,141(01):9. |
| [13] | MikiT;OgawaT;HanedaM;etal .[J].Journal of Physical Chemistry,1990,94(16):6464. |
| [14] | Oh S H;Eickel C C .[J].Journal of Catalysis,1988,112(02):543. |
| [15] | CatalunaR;ArcoyaA;SeoaneXL;etal .[J].Studies in Surface Science and Catalysis,1994,96:215. |
| [16] | Trovarelli A.;Dolcetti G.;Lorca JL.;Deleitenburg C. .CO2 METHANATION UNDER TRANSIENT AND STEADY-STATE CONDITIONS OVER RH/CEO2 AND CEO2-PROMOTED RH/SIO2 - THE ROLE OF SURFACE AND BULK CERIA[J].Journal of Catalysis,1995(1):111-124. |
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