Reaction and Characterization of Low-Temperature Effect of Transition Nanostructure Metal Codoped SCR Catalyst

Abstract

Typical p-type semiconductor MnO codoped with n-type semiconductors such as CeO 2 and V 2 O 5 was reported to achieve high efficiency in catalytic NO removal by NH 3 . In this paper, we present novel Mn-Ce codoped V 2 O 5 /TiO 2 catalyst which exhibited an excellent NO conversion efficiency of 90% at 140 ∘ C. By using this codoped catalyst, the best low-temperature activity was greatly decreased when compared with single Mn-or Ce-doped catalyst. According to the characterization results from BET, XRD, and XPS, the codoped catalyst was composed of both CeO 2 and amorphous Mn. The electron circulation formed between doping elements is believed to promote the electron transfer, which may be one of the reasons for excellent low-temperature denitration performance.