Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5–WO3/CeO2–TiO2 catalyst

Cheng, Kai; Liu, Jian; Zhang, Tao; Li, Jianmei; Zhang, Zhao; Wei, Yuechang; Jiang, Guiyuan; Duan, Aijun

doi:10.1016/j.jes.2014.08.010

Cited by 109 publications

(42 citation statements)

References 29 publications

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“…The composite coatings appeared at peak C with a binding energy of 885.3 eV, which are assigned to Ce 3+ [35]. This indicated that trace amount of Ce existed as Ce 3+ in the Ce-Si, Ce-Ti mixed oxides, which was according to other studies [36][37][38]. The XPS results indicated that CeO 2 was deposited on the coatings, which is consistent with the results from XRD detection.…”

Section: Structure and Compositionsupporting

confidence: 87%

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Guo

et al. 2015

Ceramics International

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Section: Structure and Compositionsupporting

confidence: 87%

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Guo

et al. 2015

Ceramics International

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“…Figure 8d shows the XPS spectra of Ti 2p for the three catalysts, all of which displayed two peaks (Ti 2p 3/2 and Ti 2p 1/2 ). The binding energies of Ti 2p 3/2 and Ti 2p 1/2 for the three catalysts were all centered at about 458.4 and 464.1 eV, respectively, indicating that Ti was in 4+ oxidation state on the catalyst surface [31,32]. Further, the binding energies of Ti 2p remained practically unchanged, providing more evidence that the increased Ce 4+ was due to the synergistic interaction of Fe and Ce species via redox equilibrium of Fe 3+ + Ce 3+ Ø Fe 2+ + Ce 4+ and that the synergistic effect between Fe and Ce species was dominant.…”

Section: Xps Resultsmentioning

confidence: 92%

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

Wang

Zhang

et al. 2016

Catalysts

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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 NH 3 . 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 N 2 adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (H 2 -TPR), temperature programmed desorption (NH 3 -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 Fe 3+ /Fe 2+ and Ce 4+ /Ce 3+ 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 H 2 O and SO 2 and up to 92% NO conversion at 270˝C with 200 ppm SO 2 added over 25 h, which suggests that it is a promising industrial catalyst for mid-low temperature NH 3 -selective catalytic reduction (SCR) reaction.

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“…It is obvious that an increase in GHSV only resulted in a decrease in SCR activity at lower temperatures, which may be due to the shorter contact time between the reactant gases and catalysts. [37,38] However, an increased GHSV had little effect on H 2 O resistance. NO conversion was maintained at almost 100 % at above 100°C, and the MnÀ EuÀ Fe(1)-500 catalyst also possessed excellent H 2 O resistance, even at a relatively high GHSV of 75,000 h À 1 .…”

Section: Resultsmentioning

confidence: 98%

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

et al. 2019

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Novel MnÀ EuÀ Fe catalysts were prepared via co-precipitation method for NO x removal by selective catalytic reduction with NH 3 (NH 3 À SCR). The MnÀ EuÀ Fe(1)-500 catalyst possessed the highest level of low-temperature activity, giving 98 % NO conversion at 100°C. This catalyst also exhibited excellent H 2 O resistance capacity, even at a high gas hourly space velocity (GHSV) of 75,000 h À 1 . The NO conversion still maintained at approximately 90 % in the presence of 15 % H 2 O at 230°C after 50 h, and the adverse effects of H 2 O could be quickly eliminated after the removal of H 2 O. Detailed characterization and analysis indicated that strong interactions among Mn, Eu and Fe resulted in the excellent low-temperature SCR activity and H 2 O resistance of the MnÀ EuÀ Fe(1)-500 catalyst. The strong interactions lead to larger specific surface area, higher concentrations of Mn 4 + , Fe 3 + and O α ; improved redox properties, increased acid sites and acid strength, and more adsorption amounts of NO/NH 3 in the presence of H 2 O. The MnÀ EuÀ Fe(1)-500 catalyst is a potential future catalyst for low-temperature NO x removal derived from high-H 2 O-content flue gases of natural gas combustion.

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Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5–WO3/CeO2–TiO2 catalyst

Cited by 109 publications

References 29 publications

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

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

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

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Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5–WO3/CeO2–TiO2 catalyst

Cited by 109 publications

References 29 publications

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

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

Improved Low‐Temperature Activity and H2O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH3−SCR

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Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR