催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (9): 1552-1557.DOI: 10.3724/SP.J.1088.2012.20535

• 研究论文 • 上一篇    下一篇

Pd/NiAl2O4 催化剂上甲烷燃烧反应的红外光谱研究

刘莹1,2, 王胜1, 高典楠1, 潘秋实1,2, 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:2012-05-22 修回日期:2012-06-06 出版日期:2012-09-11 发布日期:2012-09-11

In-Situ FT-IR Study on Methane Combustion over Pd/NiAl2O4 Catalyst

LIU Ying1,2, WANG Sheng1, GAO Diannan1, PAN Qiushi1,2, 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:2012-05-22 Revised:2012-06-06 Online:2012-09-11 Published:2012-09-11

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摘要： 采用原位红外光谱研究了 Pd/NiAl2O4 催化剂上甲烷燃烧反应机理, 考察了 Pd 在载体上的氧化-还原状态对催化剂性能的影响. 结果表明, 甲酸盐向碳酸盐的转化是反应的控制步骤. 经预还原处理的催化剂在贫燃富氧条件下反应一段时间后, 活性组分仍为 Pd-PdO 混合形态; Pd 单质的存在使 O2 在其上吸附形成活性 O2– 物种, 从而促进了甲酸盐向碳酸盐的转化.

关键词: 钯, 镍铝尖晶石, 甲烷, 催化燃烧, 原位红外

Abstract: The mechanism of methane combustion on Pd/NiAl2O4 catalyst was studied by in-situ FT-IR spectroscopy. The results showed that the transformation from formate to carbonate was the rate-determining step for the reaction. After reaction under lean fuel condition, the active site of pre-reduced catalyst was still Pd-PdO mixed phase. The existence of metal Pd would convert O2 to O2– species, which would facilitate the transformation from formate to carbonate.

Key words: palladium, nickel aluminum spinel, methane, catalytic combustion, in-situ infrared spectroscopy