催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (2): 163-169.

• 研究论文 • 上一篇    下一篇

制备方法及焙烧温度对Co3O4/CeO2催化剂上CO低温氧化反应的影响

邵建军1,2,张平1,唐幸福2,张保才2,宋巍2,徐奕德2,申文杰2   

  1. 1 装甲兵工程学院装备再制造国防科技重点实验室, 北京 100072;2 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023
  • 收稿日期:2007-02-25 出版日期:2007-02-25 发布日期:2011-01-28

Effect of Preparation Method and Calcination Temperature on Low-Temperature CO Oxidation over Co3O4/CeO2 Catalyst

SHAO Jianjun1,2, ZHANG Ping1, TANG Xingfu2, ZHANG Baocai2, SONG Wei2, XU Yide2, SHEN Wenjie2*   

  1. 1 National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing 100072, China; 2 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2007-02-25 Online:2007-02-25 Published:2011-01-28

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687

被引次数

68

摘要： 分别采用沉淀氧化法、均匀沉淀法及络合燃烧法制备了Co3O4/CeO2复合氧化物催化剂,并在干燥及湿气条件下进行了CO氧化反应. 结果表明,采用沉淀氧化法经538 K焙烧制得的Co3O4/CeO2催化剂具有优异的CO低温氧化活性和较高的抗湿性能. 在196 K条件下,该催化剂上CO氧化的转化率为99%, 并且可连续保持400 min以上; 当温度上升到298 K时,经过 2400 min反应后, CO的转化率仍可达到94%; 当反应气中含3.1%湿气,温度为383 K时,经过2400 min反应后, CO的转化率仍保持在79%. 实验表明, Co3O4/CeO2催化剂的制备方法及焙烧温度对Co3O4与CeO2之间的相互作用有显著的影响,进而影响催化剂催化CO低温氧化的活性.

关键词: 氧化钴, 氧化铈, 一氧化碳

Abstract: Co3O4/CeO2 mixed oxides were prepared by coprecipitation-oxidation, homogeneous precipitation, and complexation-combustion methods. The catalysts were used to catalyze low-temperature CO oxidation under dry and humid conditions. The Co3O4/CeO2 catalyst prepared by the coprecipitation-oxidation method followed by calcination at 538 K exhibited excellent activity and good resistance to water vapor poisoning. Remarkably, a CO conversion of 99% was achieved at a temperature as low as 196 K and was maintained more than 400 min under the dry condition. When the reaction was carried out at 298 K, a CO conversion of 94% was obtained after running the reaction for 2400 min. Even when 3.1% steam was added, a CO conversion of 79% could be kept after 2400 min time-on-stream at 383 K. It is suggested that the strong interaction between Co3O4 and CeO2 is closely related to the preparation route and the calcination temperature and plays a crucial role in the CO oxidation over the Co3O4/CeO2 catalyst.

Key words: cobalt oxide, ceria, carbon monoxide