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Catalysts 2016, 6(8), 112;

Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3

1,2,*, 3, 1,2, 1,2, 1,2, 1,2 and 1,2,*
Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, China
School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404020, China
Authors to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 16 May 2016 / Revised: 13 July 2016 / Accepted: 20 July 2016 / Published: 26 July 2016
PDF [13059 KB, uploaded 27 July 2016]


A series of Fe–Ce–Ti catalysts were prepared via co-precipitation method to investigate the effect of doping Ce into Fe–Ti catalysts for selective catalytic reduction of NO with NH3. The NO conversion over Fe–Ce–Ti catalysts was considerably improved after Ce doping compared to that of Fe–Ti catalysts. The Fe(0.2)–Ce(0.4)–Ti catalysts exhibited superior catalytic activity to that of Fe(0.2)–Ti catalysts. The obtained catalysts were characterized by N2 adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (H2-TPR), temperature programmed desorption (NH3-TPD), Fourier transform infrared (FT-IR) spectrophotometry, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The data showed that the introduction of Ce results in higher surface area and better dispersion of active components on the catalyst surface and enhances the amount of surface acid sites. The interactions between Fe and Ce species were found to improve the redox ability of the catalyst, which promotes catalytic performance at low temperature. The XPS results revealed that Fe3+/Fe2+ and Ce4+/Ce3+ coexisted on the catalyst surface and that Ti was in 4+ oxidation state on catalyst surface. Ce doping increased the atomic ratio of Fe/Ti and Ce/Ti and enhanced the surface adsorbed oxygen species. In addition, Fe(0.2)–Ce(0.4)–Ti catalyst also showed better tolerance to H2O and SO2 and up to 92% NO conversion at 270 °C with 200 ppm SO2 added over 25 h, which suggests that it is a promising industrial catalyst for mid-low temperature NH3–selective catalytic reduction (SCR) reaction. View Full-Text
Keywords: SCR; denitration; catalytic activity; synergistic effect; SO2 resistance SCR; denitration; catalytic activity; synergistic effect; SO2 resistance

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Wang, X.; Zhang, L.; Wu, S.; Zou, W.; Yu, S.; Shao, Y.; Dong, L. Promotional Effect of Ce on Iron-Based Catalysts for Selective Catalytic Reduction of NO with NH3. Catalysts 2016, 6, 112.

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