分别用热解硝酸铈法和浸渍法制备了不同物性的CeO2粉体和相应的CuO/CeO2催化剂,并用XRD, HRTEM和TPR等对样品进行了表征,利用微反-色谱装置考察了其催化CO低温氧化的活性. 结果表明,热解温度影响CeO2的物性(形貌、粒度大小及分布等). 相同条件下,不同物性的CeO2载体上CuO的负载情况不同, 500 ℃热解获得的CeO2载体上非晶态CuO负载量最高,相应的CuO/CeO2催化剂活性也较高. 非晶态CuO一部分进入CeO2晶格,另一部分高度分散于CeO2表面上. 焙烧温度较低时(≤ 600 ℃), 催化剂活性受焙烧温度的影响较小,而高温(800 ℃)焙烧后,催化剂则因载体粒度增大和CuO烧结团聚等因素导致催化活性明显降低.
参考文献
| [1] | 董相廷;洪广言;于得财 .[J].硅酸盐学报,1997,25(03):323. |
| [2] | 杨春生,陈建华.氧化铈和氧化镧在汽车尾气净化催化剂中的应用[J].中国稀土学报,2003(02):129-132. |
| [3] | 钟依均;陈平;周碧;罗孟飞 .[J].应用化学,1997,14(01):49. |
| [4] | 郑修成,黄唯平,张守民,王淑荣,吴世华.负载型金属CO氧化催化体系的研究进展[J].无机化学学报,2003(11):1153-1159. |
| [5] | Shan WJ;Feng ZC;Li ZL;Jing Z;Shen WJ;Can L .Oxidative steam reforming of methanol on Ce0.9Cu0.1OY catalysts prepared by deposition-precipitation, coprecipitation, and complexation-combustion methods[J].Journal of Catalysis,2004(1):206-217. |
| [6] | Tang X L;Zhang B C;Li Y et al.[J].Catalysis Today,2004,93-95:191. |
| [7] | 刘源,王哓燕,白雪.氧化铈气凝胶担载的铜催化剂对氢气中一氧化碳选择氧化的催化性能[J].中国稀土学报,2004(04):543-546. |
| [8] | Klug H P;Alexander L E.X-Ray Diffraction Procedures[M].New York:Wiley,1974:642. |
| [9] | 潘庆谊;董晓雯;张剑平;何丽芬 .[J].无机材料学报,1997,12(04):494. |
| [10] | 董相廷,李铭,张伟,刘桂霞,洪广言.沉淀法制备CeO2纳米晶与表征[J].中国稀土学报,2001(01):24-26. |
| [11] | 王成云,苏庆德,钱逸泰.非水溶剂水热法制备CeO2纳米粉[J].化学研究与应用,2001(04):402-405. |
| [12] | Bera P.;Priolkar KR.;Sarode PR.;Hegde MS.;Emura S.;Kumashiro R. Lalla NP. .Structural investigation of combustion synthesized Cu/CeO2 catalysts by EXAFS and other physical techniques: Formation of a Ce1-xCuxO2-delta solid solution[J].Chemistry of Materials,2002(8):3591-3601. |
| [13] | Jiang XY.;Zhou RX.;Mao JX.;Chen Y.;Zheng XM.;Lu GL. .Studies of pore structure, temperature-programmed reduction performance, and micro-structure of CuO/CeO2 catalysts[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2001(3/4):208-220. |
| [14] | Martínez-Arias A;Hungría A B;Fernańdez-García M et al.[J].Journal of Physical Chemistry B,2004,108(46):17983. |
| [15] | Liu W.;Flytzanistephanopoulos M. .TOTAL OXIDATION OF CARBON MONOXIDE AND METHANE OVER TRANSITION METAL-FLUORITE OXIDE COMPOSITE CATALYSTS .1. CATALYST COMPOSITION AND ACTIVITY[J].Journal of Catalysis,1995(2):304-316. |
| [16] | Liu W .Flytzani-Stephanopoulos M[J].Chemical Engineering Journal,1996,64(02):283. |
| [17] | Kundakovic L;Flytzani-Stephanopoulos M .[J].Applied Catalysis A:General,1998,171(01):13. |
| [18] | Hocevar S;Krasovec U O;Orel B et al.[J].Applied Catalysis B:Environmental,2000,28(02):113. |
| [19] | Bera P;Aruna S T;Patil K C;Hegde M S .[J].Journal of Catalysis,1999,186(01):36. |
| [20] | Luo M F;Zhong Y J;Yuan X X;Zheng X M .[J].Applied Catalysis A:General,1997,162(1-2):121. |
| [21] | Rao GR.;Sahu HR.;Mishra BG. .Surface and catalytic properties of Cu-Ce-O composite oxides prepared by combustion method[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2003(1/3):261-269. |
| [22] | 董林;金永漱;陈懿 .[J].中国科学B辑,1996,26(06):561. |
| [23] | Avgouropoulos G;Ioannides T .[J].Applied Catalysis A:General,2003,244(01):155. |
| [24] | Zheng X Ch;Han D Zh;Wang Sh P et al.[J].Journal of Rare Earths,2005,23(01):47. |
| [25] | Lin R;Luo M F;Zhong Y J et al.[J].Applied Catalysis A:General,2003,255(02):331. |
| [26] | Lin R;Luo M F;Xie Y L et al.[J].Reaction Kinetics and Catalysis Letters,2004,81(01):65. |
| [27] | Zheng X Ch;Wu Sh H;Wang Sh P et al.[J].Applied Catalysis A:General,2005,283(1-2):217. |
| [28] | Zheng X Ch;Wang Sh P;Zhang Sh M et al.[J].Reaction Kinetics and Catalysis Letters,2005,84(01):29. |
| [29] | Zheng X Ch;Wang Sh P;Wang Sh R et al.[J].Catalysis Communications,2004,5(12):729. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%