催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (1): 135-138.DOI: 10.3724/SP.J.1088.2010.00732

• 研究论文 • 上一篇    下一篇

BaCo1-xFexO3-δ缺陷钙钛矿 NOx 储存还原催化剂的制备、结构与性能

潘广宏, 孟明, 李新刚   

  1. 天津大学化工学院天津市应用催化科学与工程重点实验室, 天津 300072
  • 收稿日期:2010-07-28 修回日期:2010-09-28 出版日期:2011-01-13 发布日期:2014-05-22

Preparation, Structure and Performance of Defected Perovskite BaCo1-xFexO3-δ Catalyst for NOx Storage and Reduction

PAN Guanghong, MENG Ming*, LI Xingang   

  1. Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2010-07-28 Revised:2010-09-28 Online:2011-01-13 Published:2014-05-22

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摘要： 制备了 B 位 Fe 取代的 BaCo1-xFexO3-δ系列缺陷钙钛矿型 NOx 储存还原 (NSR) 催化剂, 考察了其储存 NOx  与抗硫性能; 应用 N2 吸附-脱附, X 射线衍射, 红外光谱, 程序升温还原和程序升温脱附等技术对催化剂进行了表征. 结果表明, Fe 的取代提高了 BaCoO3 的抗硫能力, 当 x = 0.4 时, 样品具有相对最大的 NOx 储存量, 且在深度硫化条件下仍保持 398 μmol/g 的 NOx 储存量, 表现出很强的抗硫性能; 催化剂性能与其表面晶格氧的活泼性及氧空位的数量密切相关, NOx  在 BaCo1-xFexO3-δ样品中的储存形式主要为离子态硝酸盐和单齿硝酸盐.

关键词: 钙钛矿, 钴酸钡, 铁, 取代, 氮氧化物, 储存

Abstract: A series of B-site Fe-substituted defected perovskite BaCo1-xFexO3-δ catalyst samples for NOx storage and reduction were prepared. The NOx storage and sulfur-resistance performance were investigated. N2 adsorption-desorption, X-ray diffraction, Infrared spectroscopy, temperature-programmed reduction, and temperature-programmed desorption were employed for structural characterization. Fe-substitution can increase the sulfur resistance ability of BaCoO3 perovskite. Among the Fe-substituted samples, the one with x = 0.4 shows the largest NOx storage capacity (NSC). After deep sulfation it still possesses higher NSC (398 μmol/g), showing strong sulfur resisting ability. The mobility of surface lattice oxygen and the amount of surface oxygen vacancies are highly related to the properties of the catalyst. The NOx is mainly stored as ionic nitrate and monodentate nitrate species in the catalyst.

Key words: perovskite, barium cobalt, iron, substitution, nitrogen oxide, storage