Abstract
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.
Highlights
NOx (NO and NO2 ), which is emitted primarily from power plants and automobile exhaust gases, is considered a major environmental pollutants and has garnered world-wide research attention due to its toxicity to the air and threat to human health [1,2]
The commercial catalysts typically used for Selective catalytic reduction (SCR) are V2 O5 /TiO2 or V2 O5 –WO3 /TiO2 catalysts, which have high catalytic activity in temperatures from 300–400 ̋ C [1,3]
Compared to the H2 temperature-programmed reduction (H2 -TPR) results of Fe(0.2)–Ti and Fe(0.2)–Ce(0.4)–Ti catalysts, the total reduction peak areas of Fe(0.2)–Ce(0.4)–Ti catalysts were much larger than those of Fe(0.2)–Ti catalysts, especially at low temperatures (
Summary
NOx (NO and NO2 ), which is emitted primarily from power plants and automobile exhaust gases, is considered a major environmental pollutants and has garnered world-wide research attention due to its toxicity to the air and threat to human health [1,2]. Ceria (CeO2 ), as a catalyst support or catalyst promoter, is of substantial interest to current researchers; it has been studied extensively due to its unique redox properties and oxygen storage capability [12,13,14,15]. Iron-based catalysts show excellent catalytic activity in terms of NH3 –SCR reactions, and Ceria facilitates highly favorable catalytic performance in other metal oxides used as SCR catalysts due to its superior oxygen storage capacity and redox properties. There have been few reports, on the promotional effect of Ce on Fe–Ti catalysts prepared via co-precipitation methods for the express purposes of NO reduction. The SO2 and H2 O resistance of the catalysts were surveyed and the used catalysts were investigated using Fourier transform infrared (FT-IR) spectrophotometry and thermogravimetric analysis (TGA)
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