催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (11): 1363-1368.DOI: 10.3724/SP.J.1088.2010.00417

• 研究论文 • 上一篇    下一篇

焙烧温度对 Pd/Al2O3 催化剂上甲烷燃烧反应性能的影响

高典楠 1, 王胜 1, 刘莹 1,2, 张纯希 1, 王树东 1   

  1. 1中国科学院大连化学物理研究所, 辽宁大连 116023; 2中国科学院研究生院, 北京 100049
  • 收稿日期:2010-04-12 出版日期:2010-11-12 发布日期:2014-03-28

Methane Combustion over Pd/Al2O3 Catalyst: Effect of Calcination Temperature

GAO Diannan1, WANG Sheng1, LIU Ying1,2, ZHANG Chunxi1, WANG Shudong1,*   

  1. 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2010-04-12 Online:2010-11-12 Published:2014-03-28

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摘要： 考察了载体与催化剂焙烧温度对 Pd/Al2O3 催化剂上低浓度甲烷催化燃烧反应性能的影响. 采用 X 射线衍射、透射电镜、N2 物理吸附、NH3 程序升温脱附和 O2 程序升温氧化等手段对载体和催化剂进行了表征. 结果表明, 焙烧温度对催化剂活性及稳定性的影响显著. 随着载体焙烧温度的升高, Al2O3 的比表面积、物相结构、酸中心的数量及强度明显改变, 相应的 Pd/Al2O3 催化剂中载体与 Pd 的相互作用减弱, Pd 分散度降低. 当载体焙烧温度为 1 100 °C, Pd/Al2O3 焙烧温度为 200 °C 时, 所得催化剂在 260 h 的连续反应中, 甲烷转化率始终维持在 99%以上.

关键词: 钯, 氧化铝, 甲烷, 催化燃烧, 焙烧温度

Abstract: The effect of calcination temperature for the support and catalyst on the catalytic properties of the Pd/Al2O3 catalyst for lean methane combustion was investigated. The Pd/Al2O3 catalyst was prepared by the impregnation method using Al2O3 support calcined at 500–1 300 °C. All catalyst samples were characterized by X-ray diffraction, transmission electron microscopy, surface area measurements, temperature-programmed desorption of NH3, and temperature-programmed oxidation of O2. Calcination temperature significantly affected the catalyst activity and stability. As the calcination temperature increased, the structure of the support and the amount and intensity of the acid sites changed obviously, and the dispersion of the active component and the interaction between the support and active component decreased. The proper calcination temperature for the Al2O3 support was 1 100 °C, and the optimal calcination temperature for the Pd/Al2O3 was 200 °C. This catalyst showed high thermal stability and catalytic activity.

Key words: palladium, alumina, methane, catalytic combustion, calcination temperature