Citation: HUANG Zeng-bin, LI Cui-qing, WANG Zhen, XU Sheng-mei, FENG Ling-bo, WANG Hong, SONG Yong-ji, ZHANG Wei. Performance of Mn-Ce catalysts supported on different zeolites in the NH₃-SCR of NO_x[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(11): 1388-1393. shu

Performance of Mn-Ce catalysts supported on different zeolites in the NH₃-SCR of NO_x

Beijing Institute of Petrochemical Technology, Research Institute of Green Chemistry and Catalytic Material, Beijing 102617, China

Corresponding author: LI Cui-qing, licuiqing@bipt.edu.cn
Received Date: 15 April 2016
Revised Date: 19 July 2016

Fund Project: the National Natural Science Foundation of China 21343009

Figures(5)

With various zeolites such as β, ZSM-5 and USY as the support, a series of Mn-Ce catalysts were prepared by impregnation method and characterized by XRD, BET, NH₃-TPD, H₂-TPR and XPS; their catalytic performance in the NH₃-SCR of NO_x at low temperature was investigated. The results show that all these catalysts are highly active in the NH₃-SCR reaction at low temperature; especially, over the Mn-Ce/USY catalyst, the conversion of NO_x reaches 90% at 107℃. After loaded of manganese and cerium, the specific surface area and pore volume of supported catalysts are decreased. Amorphous MnO_x as the active component and crystalline CeO₂ are detected on the surface of ZSM-5 zeolite. The weak acid sites on the catalyst surface probably play an important role in the NH₃-SCR at low temperature. Meanwhile, a high atomic ratio of Mn⁴⁺/Mn³⁺ and concentration of adsorbed oxygen may also promote the NH₃-SCR reaction at low temperature.
- NH₃-SCR,
- manganese,
- cerium,
- zeolite,
- NO_x
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Performance of Mn-Ce catalysts supported on different zeolites in the NH₃-SCR of NO_x