采用沉淀氧化法制备了CoOx/CeO2催化剂, 并分别在干燥和含有水汽的原料气中进行了CO的氧化反应. 结果发现, CoOx/CeO2复合氧化物催化剂具有良好的CO低温氧化活性和抗水性. 在干燥的原料气中和196 K的条件下,该催化剂催化氧化CO的转化率可连续400 min以上保持在99%; 当温度升高到298 K反应 2 400 min后, CO的转化率可达到94%. 而当反应气中含有3.1%的水汽时, 在383 K下反应2 400 min后, CO的转化率仍可保持在79%.
A CoOx/CeO2 catalyst was prepared by the co-precipitation-oxidation method, and its catalytic performance for CO oxidation was investigated under humid and dry conditions ,respectively. The CoOx/CeO2 catalyst exhibited excellent activity and good resistance to water vapor poisoning. Remarkably, 99% CO conversion could be achieved at 196 K for more than 400 min under dry condition, and when the reaction was carried out at 298 K, the conversion of CO was maintained at 94% after 2 400 min. Even when 3.1% of water was added, the conversion of CO was still kept at 79% after 2 400 min on-stream at 383 K.
参考文献
[1] | Saalfrank J W;Maier W F .[J].Angewandte Chemie International Edition,2004,43(15):2028. |
[2] | Lin H K;Chiu H C;Tsai H C;Chien S H, Wang C B .[J].Catalysis Letters,2003,88(3-4):169. |
[3] | Jansson J.;Palmqvist AEC.;Fridell E.;Skoglundh M.;Osterlund L. Thormahlen P.;Langer V. .On the catalytic activity of Co3O4 in low-temperature CO oxidation[J].Journal of Catalysis,2002(2):387-397. |
[4] | Jansson J .[J].Journal of Catalysis,2000,194(01):55. |
[5] | Thormhlen P;Skoglundh M;Fridell E;Andersson B .[J].Journal of Catalysis,1999,188(02):300. |
[6] | Grillo F;Natile M M;Glisenti A .[J].Applied Catalysis B:Environmental,2004,48(04):267. |
[7] | Kang M;Song M W;Lee C H .[J].Applied Catalysis A:General,2003,251(01):143. |
[8] | Cunningham D A H;Kobayashi T;Kamijo N;Haruta M .[J].Catalysis Letters,1994,25(3-4):257. |
[9] | Christoskova St G;Stojanova M;Georgieva M;Mehandzhiev D .[J].Thermochimica Acta,1977,292(1-2):77. |
[10] | Natile, MM;Glisenti, A .CoOx/CeO2 nanocomposite powders: Synthesis, characterization, and reactivity[J].Chemistry of Materials,2005(13):3403-3414. |
[11] | Haruta M;Kobayashi T;Sano H;Yamada N.[J].Chemistry Letters,1987(02):405. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%