Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Liu, Fudong; He, Hong; Ding, Yun; Zhang, Changbin

doi:10.1016/j.apcatb.2009.09.029

Cited by 614 publications

(373 citation statements)

References 66 publications

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“…There were two desorption bands on MnO x and Mn 2 Nb 1 O x catalysts. The peaks below 200°C could be attributed to physisorbed NO x and monodentate nitrate species, and the peaks above 200°C were due to the decomposition of bridging nitrate species and bidentate nitrate species with higher thermal stability [27]. Only stable nitrate species formed on the NbO x catalyst, which could not participate in the reaction at low temperature.…”

Section: Xpsmentioning

confidence: 96%

Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Lian

Liu

et al. 2014

Chemical Engineering Journal

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257

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Section: Xpsmentioning

confidence: 96%

Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Lian

Liu

et al. 2014

Chemical Engineering Journal

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257

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“…Hints to a highly dispersed form of iron oxide in Fe0.5-W-Ce are given by the XRD, Raman and UV-vis results. The formation of a solid solution of Fe and Ce as a new active phase can lead to a higher NO x reduction efficiency [25]. This can be an explanation why the Fe0.5-W-Ce performs better compared to the W-Ce catalyst.…”

Section: Discussionmentioning

confidence: 90%

“…Two definitions for low temperature SCR applications exist in literature: some researchers claim that the operation temperature window comprises the temperature range where the NO x reduction is >80% [41]. Other research groups set a threshold of >90% NO x reduction [25]. Because stricter legal regulations for NO x emissions can be expected in the future the value of 90% is used in this study.…”

Section: Discussionmentioning

confidence: 99%

“…First, Fe oxides existed in an amorphous state and were highly dispersed over the surface of the WO3 and CeO2 lattice [14]. Second, smaller Fe ions (atomic radius 140 pm) can substitute larger Ce ions (atomic radius 185 pm) in the CeO2 lattice [23], Fe/Ti oxides [24] as well as Fe/Mn oxides [25]. For Fe1-W-Ce and Fe2-W-Ce catalysts, the larger crystallite size was observed compared with W-Ce and Fe0.5-W-Ce samples (Table 1).…”

Section: Bet and Xrdmentioning

confidence: 99%

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Novel Fe‐W‐Ce Mixed Oxide for the Selective Catalytic Reduction of NOx with NH3 at Low Temperatures

et al. 2017

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A set of novel iron doped cerium-tungsten catalysts were prepared by sol-gel method with a view to their application for low temperature selective catalytic reduction (SCR) of NO x with NH 3 in power plants. With a molar ratio Fe/W/Ce of 0.5:1:1, a NO x reduction of >90% at 200 • C was achieved. In Fe-W-Ce catalysts with low iron oxide content, it was found that the iron compounds were highly dispersed and formed a solid solution within the cerium oxide lattice, which promoted the SCR activity. Large amounts of iron in the catalysts might form a layer of Fe 2 O 3 on the catalyst surface, which induced the synergistic inhibition effect among Fe, Ce and W species. Moreover, the Fe-W-Ce catalysts possessed a high resistance to changed operation parameters as well as to deactivation by SO 2 and/or H 2 O. The novel catalyst showed to be competitive among recently developed low-temperature SCR catalysts.

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“…Previous studies illustrated that Mn species with higher oxidation state is more active in redox reactions over Mn-based catalysts , and Mn 4+ exhibits the highest activity among different manganese oxides (Kapteijn et al, 1994). The increase in Mn 4+ /Mn 3+ was beneficial to the oxidation of NO to NO 2 , which could enhance the low-temperature SCR activity (Liu et al, 2009). For Cu 2p spectra, the two characteristic peaks at 932.4 eV and 934.6 eV were attributed to Cu + and Cu 2+ , respectively, by performing peak-fitting deconvolutions.…”

Section: Xpsmentioning

confidence: 96%

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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Effect of manganese substitution on the structure and activity of iron titanate catalyst for the selective catalytic reduction of NO with NH3

Cited by 614 publications

References 66 publications

Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Manganese–niobium mixed oxide catalyst for the selective catalytic reduction of NOx with NH3 at low temperatures

Novel Fe‐W‐Ce Mixed Oxide for the Selective Catalytic Reduction of NOx with NH3 at Low Temperatures

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

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