A highly effective NbMnCeOx catalyst for NH3-SCR and in situ DRIFTS for investigating the reaction mechanism. Issue 6 (December 2022)

• Record Type: Journal Article
• Authors: Qin, Bo; Guo, Rui-tang; Wei, Lin-gang; Yin, Xue-feng; Yin, Tian-yi; Zhou, Jue; Qiu, Zhong-zhu
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 6(2022)
• Publication Date: 2022-12
• Subjects: NbmMn0.1−mCe0.9Ox -- Surface acidity -- Redox property -- Oxygen vacancy -- Ad-NH3 and ad-NOx; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108564
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Mn0.1 Ce0.9 Ox and a series of Nbm Mn0.1−m Ce0.9 Ox catalysts with different Nb doping ratios were successfully synthesized by the citric acid method. Experimental results indicated that the catalytic performances of the Nbm Mn0.1−m Ce0.9 Ox were significantly ameliorated by Nb modification. In particular, the Nb0.06 Mn0.04 Ce0.9 Ox catalyst exhibited over 90% NO conversion in the temperature range of 175–325 °C and had good resistance to SO2 &H2 O. The characterization results revealed that Nb0.06 Mn0.04 Ce0.9 Ox exhibited a larger specific surface area, superior surface acidity and redox property, higher Mn 4+ and oxygen vacancy contents compared to Mn0.1 Ce0.9 Ox . Furthermore, the more active ad-NH3 and ad-NO x species on the Nb0.06 Mn0.04 Ce0.9 Ox sample also greatly accelerated the NH3 -SCR reaction on it. Graphical Abstract: ga1 Highlights: Nb0.06 Mn0.04 Ce0.9 Ox catalyst exhibited over 90 % NOx conversion in 175–325 °C. More active ad-NH3 and ad-NOx species are available on the Nb0.06 Mn0.04 Ce0.9 Ox sample. The SCR reaction over Nb0.06 Mn0.04 Ce0.9 Ox catalyst was accelerated through the L-H mechanism.