Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (3): 607-616.DOI: 10.1016/S1872-2067(17)62781-5

• Articles • Previous Articles    

Propene and CO oxidation on Pt/Ce-Zr-SO42- diesel oxidation catalysts: Effect of sulfate on activity and stability

Lei Gua, Xiao Chena, Ying Zhoub, Qiulian Zhub, Haifeng Huanga, Hanfeng Lub   

  1. a College of Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
    b Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2016-12-08 Revised:2017-01-04 Online:2017-03-18 Published:2017-03-22
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21506194, 21676255), the Provincial Natural Science Foundation of Zhejiang Province (LY16B070011), and the Commission of Science and Technology of Zhejiang Province (2017C33106, 2017C03007).

Abstract:

Platinum/cerium-zirconium-sulfate (Pt/Ce-Zr-SO42-) catalysts were prepared by wetness impregnation. Catalytic activities were evaluated from the combustion of propene and CO. Sulfate (SO42-) addition improved the catalytic activity significantly. When using Pt/Ce-Zr-SO42- with 10 wt% SO42-, the temperature for 90% conversion of propene and CO decreased by 75℃ compared with Pt/Ce-Zr. The conversion exceeded 95% at 240℃ even after 0.02% sulfur dioxide poisoning for 20 h. Temperature-programmed desorption of CO and X-ray photoelectron spectroscopy analyses revealed an improvement in Pt dispersion onto the Ce-Zr-SO42- support, and the increased number of Pt particles built up more Pt&+-(SO42-)&- couples, which resulted in excellent activity. The increased total acidity and new Brönsted acid sites on the surface provided the Pt/Ce-Zr-SO42- with good sulfur resistance.

Key words: Diesel oxidation catalyst, Pt/Ce-Zr-SO42- catalyst, Sulfur resistance, Catalytic oxidation