Catalytic oxidation of NO with O2 over FeMnOx/TiO2: Effect of iron and manganese oxides loading sequences and the catalytic mechanism study

Zhang, Mingjie; Li, Caiting; Qin, Long; Fu, Mengfan; Zeng, Guangming; Fan, Chunzhen; Ma, Jinfeng; Zhan, Fuman

doi:10.1016/j.apsusc.2014.02.002

Cited by 63 publications

(27 citation statements)

References 53 publications

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“…According to the previous studies, Fe [40,41], Cu [37,42], Ni [13,43], Co [42] and Cr [43] showed the favorable effect on the catalytic activity among the transition metals. For the quantitative chemical analysis, the end-point of titration could not be determined due to the disturbance from the combinations between the EDTA and transition metals.…”

Section: Chemical Titration Resultsmentioning

confidence: 90%

Identification of MnO species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Fang

Xie

et al. 2015

Chemical Engineering Journal

167

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Section: Chemical Titration Resultsmentioning

confidence: 90%

Identification of MnO species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Fang

Xie

et al. 2015

Chemical Engineering Journal

167

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“…Water vapor is another factor which degrades the catalytic performance of low-temperature denitration catalysts. Zhang et al proposed that the competitive adsorption of water molecules and nitric oxide on the catalyst surface is responsible for the degraded catalytic performance (Zhang et al, 2014). Adsorption and desorption equilibrium of water vapor exist on catalyst surface and the proportion of active sites occupied by water molecules is constant at a certain temperature (Melánová et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of SO2 and H2O on VPO-Cr-PEG/TiO2 for the Low-Temperature SCR de-NOx

et al. 2019

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A catalyst 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti for low-temperature SCR de-NO x was developed and the effects of SO 2 and water vapor on its catalytic activity were investigated. Cr doping increases the molar ratio of V 5+ to V 4+ on the VPO catalyst, which promote oxidation of NO to NO 2 and catalytic activity of the VPO catalyst. An appropriate amount of redox-coupled V 5+ /V 4+ also promotes catalytic activity of the VPO catalyst. The denitration efficiency over 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti was above 98% at 150-350 • C. Cr doping also promotes the generation of Lewis acid around V 5+ center and Brønsted acid (P-OH) on the VPO catalysts. The strong surface acidity of 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti could restrain the adsorption of and oxidation of SO 2. Characterization (FT-IR, TG) results indicate that nearly no sulfate was deposited on the surface of 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti after activity test. The competitive adsorption of water molecules and nitric oxide on the catalyst surface decreases the catalytic activity of the VPO catalyst. The addition of Cr and PEG could increase the surface area and the exposure of active site of VPO catalyst, which also increase the unoccupied active sites of VPO catalysts in the presence of water vapor. The catalyst 0.1VP(0.2)O-Cr(0.01)-PEG(1 × 10 −4)/Ti for low-temperature SCR de-NO x shows high catalytic activity and exhibits high resistance to SO 2 and water vapor.

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“…Meanwhile, it was found that Mn−Fe−O x based catalysts could induce the oxidation reaction of NO into NO 2 during the NH 3 -SCR progress [11,12]. On this basis, some researchers have recently been absorbed oxidizing NO into NO 2 , due to the more high-efficiency reaction of NO 2 with NH 3 than NO [13]. Zhang et al [13] proved the NO oxidation into NO 2 or bidentate nitrite took place on the surface of FeMnO x /TiO 2 via the adsorbed oxygen.…”

Section: Introductionmentioning

confidence: 99%

“…On this basis, some researchers have recently been absorbed oxidizing NO into NO 2 , due to the more high-efficiency reaction of NO 2 with NH 3 than NO [13]. Zhang et al [13] proved the NO oxidation into NO 2 or bidentate nitrite took place on the surface of FeMnO x /TiO 2 via the adsorbed oxygen. Fang et al [14] revealed the high density of lattice oxygen in the noncrystalline Mn−Fe−O x played a leading and main role in NO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Structure–Activity Relationship Study of Mn/Fe Ratio Effects on Mn−Fe−Ce−Ox/γ-Al2O3 Nanocatalyst for NO Oxidation and Fast SCR Reaction

et al. 2018

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A series of Mn−Fe−Ce−Ox/γ-Al2O3 nanocatalysts were synthesized with different Mn/Fe ratios for the catalytic oxidation of NO into NO2 and the catalytic elimination of NOx via fast selective catalytic reduction (SCR) reaction. The effects of Mn/Fe ratio on the physicochemical properties of the samples were analyzed by means of various techniques including N2 adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and NO-TPD, meanwhile, their catalytic performance was also evaluated and compared. Multiple characterizations revealed that the catalytic performance was highly dependent on the phase composition. The Mn15Fe15−Ce/Al sample with the Mn/Fe molar ratio of 1.0 presented the optimal structure characteristic among all tested samples, with the largest surface area, increased active components distributions, the reduced crystallinity and diminished particle sizes. In the meantime, the ratios of Mn4+/Mnn+, Fe2+/Fen+ and Ce3+/Cen+ in Mn15Fe15−Ce/Al samples were improved, which could enhance the redox capacity and increase the quantity of chemisorbed oxygen and oxygen vacancy, thus facilitating NO oxidation into NO2 and eventually promoting the fast SCR reaction. In accord with the structure results, the Mn15Fe15−Ce/Al sample exhibited the highest NO oxidation rate of 64.2% at 350 °C and the broadest temperature window of 75–350 °C with the NOx conversion >90%. Based on the structure–activity relationship discussion, the catalytic mechanism over the Mn−Fe−Ce ternary components supported by γ-Al2O3 were proposed. Overall, it was believed that the optimization of Mn/Fe ratio in Mn−Fe−Ce/Al nanocatalyst was an extremely effective method to improve the structure–activity relationships for NO pre-oxidation and the fast SCR reaction.

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Catalytic oxidation of NO with O2 over FeMnOx/TiO2: Effect of iron and manganese oxides loading sequences and the catalytic mechanism study

Cited by 63 publications

References 53 publications

Identification of MnO species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Identification of MnO species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Investigation of the Effect of SO2 and H2O on VPO-Cr-PEG/TiO2 for the Low-Temperature SCR de-NOx

Structure–Activity Relationship Study of Mn/Fe Ratio Effects on Mn−Fe−Ce−Ox/γ-Al2O3 Nanocatalyst for NO Oxidation and Fast SCR Reaction

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