The role of ceria on the activity and SO2 resistance of catalysts for the selective catalytic reduction of NOx by NH3

Kwon, Dong Wook; Nam, Kwangho; Hong, Sung Chang

doi:10.1016/j.apcatb.2014.11.004

Cited by 195 publications

(70 citation statements)

References 47 publications

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“…For instance, CeO x -based mesoporous silica has been used as a catalyst [10]. However, it is easily poisoned by SO 2 or alkali metals, hindering their wider practical application [11–13]. On the other hand, optimal combinations of different metal oxides can usually exhibit better SCR efficiency and thermal stability than single oxides.…”

Section: Introductionmentioning

confidence: 99%

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

Zhan

Zhang

et al. 2017

Applied Catalysis B: Environmental

266

129

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To eliminate nitrogen oxides (NOx), a series of highly ordered mesoporous WO3(χ)-CeO2 nanomaterials (χ represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NOx with NH3 at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H2-TPR, NH3-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO3(χ)-CeO2 (χ = 0, 0.5, 0.75, 1 and 1.25) showed highly ordered mesoporous channels. Furthermore, mesoporous WO3(1)-CeO2 exhibited the best removal efficiency of NOx, and its NOx conversion ratio could reach 100% from 225 ° C to 350 ° C with a gas hourly space velocity of 30 000 h−1, which was due to higher Ce3+ concentrations, abundant active surface oxygen species and Lewis acid sites based on XPS, H2-TPR, NH3-TPD and in situ DRIFTS. In addition, several key performance parameters of mesoporous WO3(1)-CeO2, such as superior water resistance, better alkali metal resistance, higher thermal stability and N2 selectivity, were systematically studied, indicating that the synthesized mesoporous WO3(1)-CeO2 has great potential for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

Zhan

Zhang

et al. 2017

Applied Catalysis B: Environmental

266

129

View full text Add to dashboard Cite

show abstract

“…More stable residues burning at 870 C were observed in the catalyst samples with loss weight between 2 and 3%. These residues are unlikely to be related to carbonaceous residues, due to the literature usually reports lower temperature burning (Kwon et al, 2015;Zhang et al, 2015). However, NaCl, one of the main reaction product, has a melting point of 800 C that agrees with the DT3 zone combustion temperature.…”

Section: Tgamentioning

confidence: 72%

Catalytic hydrodechlorination of trichloroethylene in a novel NaOH/2-propanol/methanol/water system on ceria-supported Pd and Rh catalysts

Cobo

Becerra

Castelblanco

et al. 2015

Journal of Environmental Management

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“…(u 0 , v 0 ) peaks became broad and more intense. Recently, Kwon, et al [37] confirmed that the excellent activity can be achieved for SbVCT-std catalyst when the Ce 4? ratio [Ce 4?…”

Section: Surface Analysis By X-ray Photoelectron Spectroscopymentioning

confidence: 78%

Enhanced NH3-SCR activity of Sb-V/CeO2–TiO2 catalyst at low temperatures by synthesis modification

et al. 2015

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In this work, the synthesis of Sb-V/CeO 2 -TiO 2 catalyst was modified by controlling pH with the addition of monoethanolamine solution. All the catalysts were systematically investigated for NO x reduction with NH 3 at different reaction conditions and then characterized by XRD, BET-surface area, X-ray photoelectron spectroscopy, NO-TPD, NH 3 -TPD, and H 2 -TPR. This modified synthesis method for the Sb-V/CeO 2 -TiO 2 catalyst exhibited noticeably higher NO x reduction activity at low temperatures (\250°C). H 2 -TPR revealed an increase of reducible species for the modified catalyst at basic pH, followed by neutral pH and acidic pH, respectively. High activity of the catalyst synthesized at basic pH was persistent for NO x reduction with time that was confirmed by the time on stream durability test under SO 2 and water. The Ce 3d XPS spectra of spent catalyst synthesized at basic pH explains the gradual decrease in activity due to the decrease of Ce 4? to Ce 3? ratio by the formation of sulfates.

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The role of ceria on the activity and SO2 resistance of catalysts for the selective catalytic reduction of NOx by NH3

Cited by 195 publications

References 47 publications

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

Catalytic hydrodechlorination of trichloroethylene in a novel NaOH/2-propanol/methanol/water system on ceria-supported Pd and Rh catalysts

Enhanced NH3-SCR activity of Sb-V/CeO2–TiO2 catalyst at low temperatures by synthesis modification

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