MnOx–CeO2/Activated Carbon Honeycomb Catalyst for Selective Catalytic Reduction of NO with NH3 at Low Temperatures

Wang, Yanli; Ge, Chuanzhang; Zhan, Liang; Cui, Li; Qiao, Wenming; Ling, Licheng

doi:10.1021/ie300555f

Cited by 92 publications

(68 citation statements)

References 39 publications

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“…vacancy associates that have resulted in the intermediate decrease in the particle size. Furthermore, the result suggests the doping of Mn can efficiently inhibit growth of the cubic phase, which agrees well with the previous reports [20,21]. As the decrease in the grain size is conductive to the contact between catalysts and reactant gas flow [22], Mn dopant should have promotion effect on catalytic performance.…”

Section: Crystallographic and Morphological Structuresupporting

confidence: 90%

Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material

Ansari

Labis

Alam

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The structure, the morphology and the thermal, optical and the surface properties of nanocrystalline CeO 2 doped with Mn have been studied by X-ray diffraction (XRD), field-emission transmission electron microscopy (FE-TEM), energy-dispersive X-ray analysis, thermogravimetric analysis, UV-Vis absorption spectroscopy and Fourier transform infrared spectroscopy. The XRD results confirmed the successful incorporation of Mn into the CeO 2 lattice through the formation of nanoscale face-centered cubic solid solution. The FE-TEM observations supported the nanocrystalline nature of the solid solutions. The presence of structural defects and their role on the band gap have been discussed on the basis of absorption spectral studies. The structural differences correlate with results from temperature-programmed reaction (TPR) experiments with H 2 consumption. The TPR measurements showed an enhanced bulk reduction at much lower temperatures, indicating increased oxygen mobility in the samples, which enable to enhanced oxygen diffusion at lower temperatures.

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Section: Crystallographic and Morphological Structuresupporting

confidence: 90%

Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material

Ansari

Labis

Alam

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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“…Several diffraction peaks observed at 28 (PDF#34-0394). The peaks attributed to CeO 2 could also be seen before and after the SCR reaction [25]. However, no manganese oxide phases could be detected, indicating that the manganese oxides formed as primary crystals of less than approximately 4 nm, which was consistent with the report by Machida et al [26].…”

Section: Xpssupporting

confidence: 90%

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

et al. 2018

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Honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 , with and without SO 2 and/or H 2 O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NO x conversion at 100 • C in the absence of SO 2 . However, SO 2 reduces the catalytic activity (80% to 72%) of the honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts under identical conditions. This finding demonstrated that the catalyst exhibited high activity at low temperature and excellent SO 2 resistance in the presence of 50 ppm SO 2 . The fresh and sulfated honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. Characterization results indicated that the deactivation by SO 2 was primarily the result of the deposition of ammonium hydrogen sulfate and sulfated CeO 2 on the catalyst surface during the SCR process. The formed sulfates depressed the catalytic activity via the blocking of pores and the occupation of active sites. Additionally, the competitive adsorption between SO 2 and NH 3 always decreased the catalytic activity.

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“…It can be found that the addition of CeO x to the 9%Mn/TiO 2 -0.8%GO had a negative effect on the specific surface area and the porous structure parameters, which has also been proven by some other analogous research [19,45,46]. When the ratio was no more than 0.3, this tendency was not very obvious, but when the Ce/Mn molar ratio reached 0.4, the specific surface area and total pore volume of the catalysts decreased significantly.…”

Section: Bet Surface Areas and Pore Size Distributionssupporting

confidence: 58%

The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature

Tong

Song

2017

Crystals

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Abstract:A series of 9%CeO x -MnO x /TiO 2 -GO nanocomposites with different molar ratios of Ce/Mn were synthesized by the sol-gel and ultrasonic impregnation methods and characterized by field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM), N 2 adsorption (BET) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The results showed that various valences of Ce and Mn oxides were uniformly distributed on the surface of TiO 2 -GO multilayered supports. The coexistence of various valences of Ce and Mn oxides can improve the redox performance of the catalyst. With the introduction of Ce, the amount of MnO 2 and non-stoichiometric MnO x /Mn, the total oxygen and chemisorbed oxygen content, and the electron transfer ability of the catalyst increased significantly. When the molar ratio of Ce/Mn was 0.3, the catalysts exhibited high selective catalytic reduction activity (more than 99% at 180 • C) and N 2 selectivity. The presence of hydrophilic groups on the surface of the GO was considered as the critical factor influencing the H 2 O resistance of the catalyst. Due to the pre-sulfuring process of GO, serious sulfation of the active component can be prevented, and the catalyst exhibited excellent SO 2 resistance.

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MnO_x–CeO₂/Activated Carbon Honeycomb Catalyst for Selective Catalytic Reduction of NO with NH₃ at Low Temperatures

Cited by 92 publications

References 39 publications

Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material

Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature

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