Citation: GUO Li-li, LIU Lu, ZHU Xiao-lin, ZHANG Qiang, LI Chun-yi. Effect of Mg/Al molar ratios on NO reduction activity of CO using Ce-La/MgAl₂O₄-x catalysts[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(6): 723-730. shu

Effect of Mg/Al molar ratios on NO reduction activity of CO using Ce-La/MgAl₂O₄-x catalysts

State Key Laboratory of Heavy Oil Processing, China University of Petroleum(East China), Qingdao 266580, China

Corresponding author: LI Chun-yi, chuyli@upc.edu.cn
Received Date: 14 March 2017
Revised Date: 17 April 2017

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A series of Ce-La/MgAl₂O₄-x catalysts were prepared by the incipient wetness impregnation method and characterized by BET, XRD, H₂-TPR, CO-TPR and in situ FT-IR. The results demonstrate that the catalyst with a Mg/Al molar ratio of 0.5 yields the most uniform dispersion of CeO₂ and greatly enhances formation of Ce-O-La solid solution, resulting in the increase of oxygen vacancy and surface Ce³⁺ content. Thereby, the synergistic effect between surface Ce³⁺ and oxygen vacancy gives rise to the best catalytic performance of NO reduction. Moreover, introduction of Mg species suppresses tranformation of CeO₂ to Ce(SO₄)₂/Ce₂(SO₄)₃ and then improves the SO₂ resistance performance of Ce-La/MgAl₂O₄-0.5.
- NO reduction,
- Ce-La/MgAl₂O₄-x catalysts,
- Ce-O-La solid solution,
- SO₂ resistance
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Effect of Mg/Al molar ratios on NO reduction activity of CO using Ce-La/MgAl₂O₄-x catalysts