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Citation: Xuehua Yu, Zhen Zhao, Yuechang Wei, Jian Liu, Jianmei Li, Aijun Duan, Guiyuan Jiang. Synthesis of K-doped three-dimensionally ordered macroporous Mn0.5Ce0.5Oδ catalysts and their catalytic performance for sootoxidation[J]. Chinese Journal of Catalysis, ;2015, 36(11): 1957-1967. doi: 10.1016/S1872-2067(15)60949-4 shu

Synthesis of K-doped three-dimensionally ordered macroporous Mn0.5Ce0.5Oδ catalysts and their catalytic performance for sootoxidation

  • 1.

    a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;

  • Corresponding author: Zhen Zhao, 
  • Received Date: 21 June 2015
    Available Online: 2 July 2015

    Fund Project: 国家自然科学基金(21177160, 21303263, 21477164) (21177160, 21303263, 21477164) 北京市新星计划(Z141109001814072) (Z141109001814072) 高等学校博士学科点专项科研基金(20130007120011) (20130007120011) 中国石油大学(北京)科学基金(2462013YJRC13, 2462013BJRC003). (北京)科学基金(2462013YJRC13, 2462013BJRC003)

  • A series of K-doped Mn0.5Ce0.5Oδ (K-MCO) catalysts with three-dimensionally ordered macroporous (3DOM) structure and different K loadings were successfully synthesized using simple methods. These catalysts exhibited well-defined 3DOM nanostructure, which consisted of extensive interconnecting networks of spherical voids. The effects of the calcination temperature and calcination time on the morphological characteristics and crystalline forms of the catalysts were systematically studied. The catalysts showed high catalytic activity for the combustion of soot. 3DOM 20% K-MCO-4h catalyst, in particular, showed the highest catalytic activity of all of the catalysts studied (e.g., T50 = 331 ℃ and SmCO2 = 95.3%). The occurrence of structural and synergistic effects among the K, Mn, and Ce atoms in the catalysts was favorable for enhancing their catalytic activity towards the combustion of diesel soot. Furthermore, the temperatures required for the complete combustion of the soot (<400 ℃) were well within the exhaust temperature range (175-400 ℃), which means that the accumulated soot can be removed under the conditions of the diesel exhaust gas. These catalysts could therefore be used in numerous practical applications because they are easy to synthesize, exhibit high catalytic activity, and can be made from low cost materials.
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