Study on the mechanism of the oxidation of soot on Fe2O3 catalyst

Wagloehner, Steffen; Kureti, Sven

doi:10.1016/j.apcatb.2012.05.032

Cited by 70 publications

(62 citation statements)

References 24 publications

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“…The best performances are obtained with Cu-Sr combination, with a Tp of 468 and 482 • C for Zr and Ce sample, respectively, compared to 501 • C and 496 • C for SrFeZr and SrFeCe. As shown in Figure 4 when soot oxidation is carried out with a mixture of NO/O2, an enhancement in catalytic combustion was found, compared to the reaction performed under oxygen environment and the reason could be ascribed to two different mechanisms that could take part in a NO/O2 atmosphere: (i) from one side soot can be oxidized by active oxygen species (O*) that are generated over Cu-or Fe-containing materials, i.e., transition metals exhibit the capability to cycle between two states of oxidation contributing to soot combustion [45,48,49]; (ii) on the other hand, the NOx-assisted mechanism can improve the catalytic activity forming NO2, a more oxidant and mobile species [71]. As shown in Figure 4 when soot oxidation is carried out with a mixture of NO/O 2 , an enhancement in catalytic combustion was found, compared to the reaction performed under oxygen environment and the reason could be ascribed to two different mechanisms that could take part in a NO/O 2 atmosphere: (i) from one side soot can be oxidized by active oxygen species (O*) that are generated over Cu-or Fe-containing materials, i.e., transition metals exhibit the capability to cycle between two states of oxidation contributing to soot combustion [45,48,49]; (ii) on the other hand, the NO x -assisted mechanism can improve the catalytic activity forming NO 2 , a more oxidant and mobile species [71].…”

Section: Catalytic Testsmentioning

confidence: 99%

“…Catalysts 2017, 7, 28 6 of 13 As shown in Figure 4 when soot oxidation is carried out with a mixture of NO/O2, an enhancement in catalytic combustion was found, compared to the reaction performed under oxygen environment and the reason could be ascribed to two different mechanisms that could take part in a NO/O2 atmosphere: (i) from one side soot can be oxidized by active oxygen species (O*) that are generated over Cu-or Fe-containing materials, i.e., transition metals exhibit the capability to cycle between two states of oxidation contributing to soot combustion [45,48,49]; (ii) on the other hand, the NOx-assisted mechanism can improve the catalytic activity forming NO2, a more oxidant and mobile species [71]. In the case of NO x -assisted reaction it is important that the catalyst can promote the oxidation of NO to NO 2 at low temperature.…”

Section: Catalytic Testsmentioning

confidence: 99%

“…Several studies investigated the promotional effects of copper and iron in soot combustion catalysts under O 2 atmosphere [20,22,45,48]. The mechanism of reaction commonly proposed is correlated to the presence of M x O y particles and the ability of the metal to be reduced to M (n−1)+ and then reoxidized to M n+ , producing active oxygen species that can easily react with soot [45,50].…”

Section: Catalytic Testsmentioning

confidence: 99%

“…Among transition metals, Fe and Cu have often been employed as dopants/promoters of soot oxidation catalysts supported on metal oxides with different properties, such as alumina, titania, zirconia, and ceria [16,19,22,[44][45][46][47]. The mechanism path commonly proposed for Cu-and Fe-based materials is correlated to the presence of metal oxide particles and their capability to be cyclically reduced and then reoxidized by O 2 gas phase or lattice oxygen from the support [45,48,49].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Rico-Pérez¹,

Aneggi²,

Trovarelli³

2017

Catalysts

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This study investigates the activity of transition and alkaline-earth metal-doped catalysts supported on ceria or zirconia for the NO x -assisted oxidation of diesel particulate. A series of Cu-and Fe-impregnated catalysts over CeO 2 and ZrO 2 supports were prepared by incipient wetness impregnation and characterized by BET, X-ray diffraction (XRD), and temperature-programmed reduction (TPR) experiments while their catalytic activity was investigated in NO x -assisted reaction by means of temperature programmed oxidation experiments (TPO). Higher activity was achieved by copper modified catalysts; the addition of Sr positively affected the performance of the materials, suggesting a synergic effect between transition metals and alkaline-earth metal. The role of copper is correlated to the oxidation of NO to NO 2 , while strontium seems to be mainly involved in the storage of NO x species.

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Section: Catalytic Testsmentioning

confidence: 99%

Section: Catalytic Testsmentioning

confidence: 99%

Section: Catalytic Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Rico-Pérez¹,

Aneggi²,

Trovarelli³

2017

Catalysts

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“…Hematite nanoparticles proved to be effective catalyst in numerous reactions such as the decomposition of soot and NO x in diesel exhausts [13], oxidation of CO [14], photocatalytic degradation of salicylic acid [15], and FischerTropsch synthesis [16]. An iron-based solid catalyst is also normally used as a Lewis acid catalyst and/or support in homogeneous and heterogeneous catalysis [17].…”

Section: Introductionmentioning

confidence: 99%

Sonochemical Synthesis of Hematite Nanoparticles

Mihail¹

2015

ChemJMold

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Abstract. Hematite nanoparticles were prepared by a procedure consisting in sonication of μ 3 -oxo trinuclear iron(III) acetate of composition [Fe 3 O(OOCCH 3 ) 6 (H 2 O) 3 ]NO 3 •4H 2 O, {Fe 3 O}NO 3 as iron source, in strong basic conditions followed by thermal treatment at 600˚C. The formation of the hematite was confi rmed by IR spectroscopy, X-ray powder diffraction and Raman spectroscopy while, the shape and size of the nanoparticles and their agglomeration were evidenced and estimated on the basis of the images taken with TEM techniques.Keywords: hematite, nanoparticles, iron oxides, sonochemistry. There are various forms of iron oxides [7]. They differ in composition, in the valence of Fe and, above all, in crystal structure. The most stable and wide spread oxide phase of iron is α-Fe 2 O 3 , where Fe has the lower Gibbs free energy [8]. Hematite has hexagonal structure of the corundum type with a close-packed oxygen lattice in which twothirds of the octahedral sites are occupied by Fe(III) ions. Bulk hematite is antiferromagnetic till Morin temperature (TM) (~260 K). Between TM and Neel temperature (TN) (~ 950K) it is weak ferromagnetic and above TN the hematite is paramagnetic [9,11]. These transitions are infl uenced by particle size, shape and crystallinity [9][10][11]. Particles smaller than 16 nm have a superparamagnetic behaviour at room temperature [12].Hematite nanoparticles proved to be effective catalyst in numerous reactions such as the decomposition of soot and NO x in diesel exhausts [13], oxidation of CO [14], photocatalytic degradation of salicylic acid [15], and FischerTropsch synthesis [16]. An iron-based solid catalyst is also normally used as a Lewis acid catalyst and/or support in homogeneous and heterogeneous catalysis [17]. Hematite nanoparticles could be applicable in water treatment technology for removing metal [18]. Hematite has a bandgap of 2-2.2 eV thus being semiconductor suitable for photocatalytic water-splitting with hydrogen formation [19].The hematite nanoparticles could be obtained by different routes: co-precipitation [20], microemulsion method [20,21], thermal decomposition [20,22] Our approach in this study is to obtain hematite nanoparticles using μ 3 -oxo homotrinuclear {Fe 3 O}NO 3 acetate as an iron source and easy sonochemical route as a synthesis procedure. The obtained product was characterized by adequate techniques (FTIR, energy-dispersive X-ray spectroscopy, Raman spectroscopy, wide angle X-ray spectroscopy, transmission electron microscopy), in order to evaluate the formed structure.

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Hydrocarbon and Soot Oxidation over Cerium and Iron Doped Vanadium SCR Catalysts

et al. 2020

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V2O5−WO3/TiO2 (VWTi) catalysts are widely employed for selective catalytic reduction (SCR) of NOx. However, due to their poor thermal stability the application in diesel particulate filters (DPFs), i. e. 2‐way SCRonDPF is limited. In this study, the potential of Ce‐ and Fe‐doped VWTi systems for hydrocarbon and soot oxidation in addition to the SCR activity was systematically investigated for fresh and thermally aged samples. The formation of metal vanadates upon thermal aging, as identified by X‐ray diffraction, Raman and X‐ray adsorption spectroscopy, prevents drastic sintering of the support and maintains a high NOx−SCR and hydrocarbon oxidation activity. Additionally, the doped VWTi catalysts show a slight increase of the CO2 selectivity during hydrocarbon oxidation, which represents an important aspect for such multifunctional catalysts. Despite of the advantages, the formation of metal vanadates hinders the mobility of vanadium species and decreases the soot oxidation ability of the doped catalysts. Interestingly, a promising soot oxidation activity was identified for the VWTi−Fe sample after aging at 650 °C, which resulted in decomposition of the iron vanadate and generation of highly dispersed and mobile V2O5.

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Study on the mechanism of the oxidation of soot on Fe2O3 catalyst

Cited by 70 publications

References 24 publications

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

The Effect of Sr Addition in Cu- and Fe-Modified CeO2 and ZrO2 Soot Combustion Catalysts

Sonochemical Synthesis of Hematite Nanoparticles

Hydrocarbon and Soot Oxidation over Cerium and Iron Doped Vanadium SCR Catalysts

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