Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (9): 1624-1629. Previous Articles     Next Articles

Original Articles

Pd/NaZSM-5负载型催化剂上CO完全氧化研究

毕玉水;刘建福;吕功煊   

  1. 中国科学院兰州化学物理研究所,兰州(730000)
  • 出版日期:2002-09-15 发布日期:2002-09-15

Studies of CO Complete Oxidation over Pd/NaZSM-5 Supported Catalysts

Bi Yushui;Liu Jianfu;Lu Gongxuan   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou(730000)
  • Online:2002-09-15 Published:2002-09-15

A series of NaZSM-5 supported palladium catalysts have been prepared by impregnation method. Influences of the calcination temperature, reaction temperature, Pd content and reduction on CO oxidation have been studied. It is found that the catalytic activity decreased with the increase of the calcination temperature. the higher reaction temperature or Pd content resulted in the higher catalytic performance for CO oxidation, and H_2 reduction on catalyst resulted in lower catalytic performance. The results of XRD and TEM show that Pd species are highly dispersed over NaZSM-5 zeolite, which is dependent on the pretreatment temperatures and reaction conditions. Analysis of the surface by XPS proves the PdO_2 is easily reduced to PdO and Pd by CO and H_2, which is related to the deactivation of Pd/NaZSM-5 catalyst for CO complete oxidation.

Key words: PALLADIUM, ZSM-5, NO, CATALYTIC ACTIVITY

CLC Number: