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

doi:10.1016/S1872-2067(15)60949-4

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (11): 1957-1967.DOI: 10.1016/S1872-2067(15)60949-4

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Synthesis of K-doped three-dimensionally ordered macroporous Mn_0.5Ce_0.5O_δ catalysts and their catalytic performance for sootoxidation

Xuehua Yu^a,b, Zhen Zhao^a, Yuechang Wei^a, Jian Liu^a, Jianmei Li^a, Aijun Duan^a, Guiyuan Jiang^a

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
b Institute of Catalysis for Energy and Environment, Shenyang Normal University, Shenyang 110034, Liaoning, China

Received:2015-06-21 Revised:2015-07-02 Online:2015-11-02 Published:2015-11-02
Supported by:
This work was supported by the National Natural Science Foundation of China (21177160, 21303263, 21477164), Beijing Nova Program (Z141109001814072), Specialized Research Fund for the Doctoral Program of High Education of China (20130007120011), and the Science Foundation of China University of Petroleum-Beijing (2462013YJRC13, 2462013BJRC003).

Abstract

Abstract:

A series of K-doped Mn_0.5Ce_0.5O_δ (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 S^m_CO2 = 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.

Key words: Three-dimensionally ordered macroporous structure, Mn_0.5Ce_0.5O_δ catalyst, Potassuim doping, Soot combustion

Xuehua Yu, Zhen Zhao, Yuechang Wei, Jian Liu, Jianmei Li, Aijun Duan, Guiyuan Jiang. Synthesis of K-doped three-dimensionally ordered macroporous Mn_0.5Ce_0.5O_δ catalysts and their catalytic performance for sootoxidation[J]. Chinese Journal of Catalysis, 2015, 36(11): 1957-1967.

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Synthesis of K-doped three-dimensionally ordered macroporous Mn_0.5Ce_0.5O_δ catalysts and their catalytic performance for sootoxidation

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