催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (8): 1354-1359.DOI: 10.3724/SP.J.1088.2012.20340

• 研究论文 • 上一篇    下一篇

Ni 的引入对 Pd/Al2O3 催化甲烷燃烧性能的影响

刘莹1,2, 王胜1, 高典楠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:2012-03-21 修回日期:2012-04-05 出版日期:2012-08-01 发布日期:2012-08-01

Effect of Ni Addition on Methane Catalytic Combustion Performance of Pd/Al2O3 Catalyst

LIU Ying1,2, WANG Sheng1, GAO Diannan1, 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:2012-03-21 Revised:2012-04-05 Online:2012-08-01 Published:2012-08-01

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摘要： 采用浸渍法制备了 Ni 掺杂的 Pd/Al2O3 催化剂, 考察了其低浓度甲烷催化燃烧活性和水热稳定性. 结果表明, 随着 Ni 的引入及其含量的增加, Pd/Al2O3 催化剂性能明显提高, Ni 含量至 20% 时, 在 0.4% CH4, 4% H2O 和空气平衡的原料气组成, 80000 h-1 空速和 600 oC 条件下反应 150 h 后, CH4 转化率仍能保持在 97.5% 以上. X 射线衍射、H2 程序升温还原、NH3 程序升温脱附和透射电镜等结果表明, NiAl2O4 晶相的形成改善了载体酸性和活性组分的分散度, 从而提高了催化剂性能.

关键词: 钯, 氧化铝, 镍, 甲烷, 催化燃烧

Abstract:  Pd/Al2O3 catalyst samples modified by Ni promoter were prepared and tested for methane catalytic combustion under lean-fuel condition. A series of Pd catalyst samples with different Ni contents were characterized by N2 adsorption, X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of ammonia and transmission electron microscopy. In addition, the performance of the catalyst samples for lean methane combustion was studied. The results showed that the addition of Ni effectively improved the activity and hydrothermal stability of catalyst samples due to the formation of NiAl2O4 spinel. As Ni content increased, the NiAl2O4 content increased, thus the performance of the catalyst increased. For Pd/Ni-Al2O3 sample with 20% Ni, methane conversion remained 97.5% after 150 h at 600 oC. Weaker acidity of the supports and the well dispersion of Pd particles on the supports contributed by NiAl2O4 phase might be the reason of high performance of the catalyst.

Key words: palladium, alumina, nickel, methane, catalytic combustion