催化学报 ›› 2011, Vol. 32 ›› Issue (9): 1469-1476.DOI: 10.1016/S1872-2067(10)60259-8

• 研究论文 • 上一篇    下一篇

Pt/CeO2-ZrO2-La2O3 柴油车尾气氧化催化剂活性及抗硫性能

钟富兰, 钟喻娇, 肖益鸿, 蔡国辉, 郑勇, 魏可镁*   

  1. 福州大学化肥催化剂国家工程研究中心, 福建福州 350002
  • 收稿日期:2011-04-18 修回日期:2011-06-03 出版日期:2011-09-09 发布日期:2015-01-24

Sulfur Resistance and Activity of Pt/CeO2-ZrO2-La2O3 Diesel Oxidation Catalysts

ZHONG Fulan, ZHONG Yujiao, XIAO Yihong, CAI Guohui, ZHENG Yong, WEI Kemei*   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, Fujian, China
  • Received:2011-04-18 Revised:2011-06-03 Online:2011-09-09 Published:2015-01-24

摘要: 采用两种方法制备了三种 Pt/CeO2-ZrO2-La2O3 柴油车尾气氧化催化剂, 并用 X 射线衍射、N2 物理吸附、程序升温还原、程序升温脱附、X 射线荧光光谱和红外光谱等方法对其进行了表征. 结果发现, 制备方法对催化剂的结构、织构、抗硫性能及催化性能的影响非常大. 对其进行硫中毒, 导致起燃温度明显升高. 将 ZrO2和 La2O2 沉积在 CeO2表面所制得的 Pt/CeO2-ZrO2-La2O3 催化剂表现出更高的抗硫及催化氧化性能, 这主要归功于 Pt 在富 Zr 载体表面具有更高的分散性.

关键词: 氧化铈, 氧化锆, 氧化镧, 铂, 沉积沉淀, 硫中毒, 柴油车尾气净化

Abstract: Three Pt/CeO2-ZrO2-La2O3 diesel oxidation catalysts were prepared by two different routes and characterized by X-ray diffraction, N2 adsorption, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, and infrared spectroscopy. The synthesis procedure affected the structure, texture, sulfur resistance, and catalytic activity of the catalysts. Sulfur poisoning increased the light-off temperature of all the catalysts, but the Pt/CeO2-ZrO2-La2O3 catalyst prepared by depositing ZrO2 and La2O3 on the surface of CeO2 nanoparticles exhibited better sulfur tolerance and catalytic activity with simulated diesel emission due to the high dispersion of Pt on CeO2-ZrO2-La2O3 oxide with a Zr-rich surface.

Key words: ceria, zirconia, lanthana, platinum, deposition-precipitation, sulfur-poisoning, diesel exhaust purification