Low-temperature selective catalytic reduction of NO x with NH3 over Fe–Cu mixed oxide/ZSM-5 catalysts containing Fe2CuO4 phase

Zhang, Jie; Qu, Hongxia

doi:10.1007/s11164-014-1580-2

Cited by 16 publications

(6 citation statements)

References 33 publications

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“…The satellite peak energy corresponds well with that reported for Fe2O3 [45]. The Fe 2p3/2 peak was deconvolved into two components with peaks at 710.4 eV and 712.6 eV indicative of Fe 2+ and Fe 3+ phases [46], respectively. The results indicate that the percentage of Fe atoms in the Fe 3+ state listed in Table 2 are about 13% less in the VMT support of the MnOx/VMT catalyst than that of the MnOx-Fe2O3/VMT catalyst.…”

Section: Resultssupporting

confidence: 82%

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

Zhang

Dan

et al. 2018

Catalysts

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Selective catalytic reduction of NO x by ammonia (NH 3 -SCR) was the most efficient and economic technology for De-NO x applications. Therefore, a series of MnO x /vermiculite (VMT) and MnO x -Fe 2 O 3 /VMT catalysts were prepared by an impregnation method for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ). The MnO x -Fe 2 O 3 /VMT catalysts provided an excellent NO conversion of 96.5% at 200 • C with a gas hourly space velocity (GHSV) of 30,000 h −1 and an NO concentration of 500 ppm. X-ray photoelectron spectroscopy results indicated that the Mn and Fe oxides of the MnO x -Fe 2 O 3 /VMT catalyst were mainly composed of MnO 2 and Fe 2 O 3 . However, the MnO 2 and Fe 2 O 3 components were well dispersed because no discernible MnO 2 and Fe 2 O 3 phases were observed in X-ray powder diffraction spectra. Corresponding MnO x -Fe 2 O 3 /VMT monolithic honeycomb catalysts (MHCs) were prepared by an extrusion method, and the MHCs achieved excellent SCR activity at low temperature, with an NO conversion greater than 98.6% at 150 • C and a GHSV of 4000 h −1 . In particular, the MnO x -Fe 2 O 3 /VMT MHCs provided a good SCR activity at room temperature (20 • C), with an NO conversion of 62.2% (GHSV = 1000 h −1 ). In addition, the NO reduction performance of the MnO x -Fe 2 O 3 /VMT MHCs also demonstrated an excellent SO 2 resistance.

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Section: Resultssupporting

confidence: 82%

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

Zhang

Dan

et al. 2018

Catalysts

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“…Nitrogen oxides (NO x ) are global air pollutants, resulting from high-temperature combustion processes and adverse poisons in the atmosphere [1][2][3], including nitrogen monoxide (NO), nitrogen dioxide (NO 2 ), nitrous oxide (N 2 O), and their derivatives, which have a wide range of health and environmental impacts. Selective catalytic reduction (SCR) of NO x with NH 3 is an advanced, economic, and fuel-efficient technology that allows the removal of NO x from stationary sources [4].…”

Section: Introductionmentioning

confidence: 99%

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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“…Great efforts have been made to modify the structure and properties of OMC, and transitional metal oxides (MnO x Su et al, 2013), CuO x (Ouzzine et al, 2008;Amanpour et al, 2013;Chen et al, 2014), CeO x (Shen et al, 2013;Zhang et al, 2013), FeO x Zhang and Qu, 2015), etc.) are introduced to prepare metal-containing OMC catalysts based on their enhancement in catalytic performance as active phases.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of NO over Cu-Mn/OMC Catalysts: Effect of Preparation Method

Cao

Zhu

et al. 2017

Aerosol Air Qual. Res.

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Ordered mesoporous carbon (OMC) was used as support for CuO x and MnO x , and the effects of preparation method on selective catalytic reduction (SCR) of NO with NH 3 were investigated. The Cu-Mn/OMC prepared by solvent evaporation-induced self-assembly method, named as self-assembly synthesis (S), exhibited higher NO conversion and N 2 selectivity than the catalyst prepared by ultrasound-assisted impregnation (I) or mechanical mixing (M). The structural and surface properties of catalysts were characterized by various techniques. XRD and TEM results showed good dispersion of active phases on Cu-Mn/OMC(S). XPS analysis suggested that the surface of Cu-Mn/OMC(S) had the maximum amount of O-C=O groups and chemisorbed O. The strongest acidity and largest amount of oxidative species were further illustrated by NH 3 -TPD and H 2 -TPR profiles, which were consistent with the XPS results. Accordingly, these favorable properties may be the main reasons for the outstanding performance of Cu-Mn/OMC(S) in NH 3 -SCR reaction. Thus, selfassembly synthesis can be considered an effective method for the preparation of OMC-supported catalysts.

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Low-temperature selective catalytic reduction of NO x with NH3 over Fe–Cu mixed oxide/ZSM-5 catalysts containing Fe2CuO4 phase

Cited by 16 publications

References 33 publications

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

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

Selective Catalytic Reduction of NO over Cu-Mn/OMC Catalysts: Effect of Preparation Method

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