Effects of cerium on the selective catalytic reduction activity and structural properties of manganese oxides supported on multi-walled carbon nanotubes catalysts

doi:10.1016/S1872-2067(11)60520-2

Abstract

Abstract:

A series of manganese and cerium oxides supported on multi-walled carbon nanotubes (MWCNTs) catalysts for low-temperature NH₃ selective catalytic reduction (SCR) of NO_x were prepared by the pore volume impregnation method. The SCR activity of Mn-Ce/MWCNTs catalysts was compared with that of Mn/MWCNTs catalyst. The effects of Ce were characterized by transmission electron microscopy, N₂ adsorption-desorption, H₂ temperature-programmed reduction, X-ray photoelectron spectroscopy and X-ray powder diffraction. The results show that the addition of cerium oxides could improve the SCR activity of Mn/MWCNTs catalysts. Mn-Ce/MWCNTs catalyst with a Ce/Mn ratio of 0.6 was found to have the highest activity. The addition of cerium oxides enhanced the dispersion of metal oxides on the MWCNTs. It could also increase the specific surface area and total pore volume, and decrease the average pore size of the catalysts. Ce would improve the concentration of oxygen and the valence of manganese. Furthermore, from the XRD results, it was obvious that the crystalline MnO_x disappeared because of the introduction of Ce to the catalyst. MnO_x mainly existed in an amorphous state or microcrystal structure in the Mn-Ce/MWCNTs catalysts. CeO₂ was found to be the main phase for CeO_x.

Key words: Selective catalytic reduction, Nitrogen oxide, Cerium, Manganese, Multi-walled carbon nanotube

LI li, WANG Lishan, PAN Siwei, WEI Zhengle, HUANG Bichun. Effects of cerium on the selective catalytic reduction activity and structural properties of manganese oxides supported on multi-walled carbon nanotubes catalysts[J]. Chinese Journal of Catalysis, 2013, 34(6): 1087-1097.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(11)60520-2

https://www.cjcatal.com/EN/Y2013/V34/I6/1087

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