Ceria-supported small Pt and Pt 3 Sn nanoparticles for NO x -assisted soot oxidation

Andana, Tahrizi; Piumetti, Marco; Bensaid, Samir; Veyre, Laurent; Thieuleux, Chloé; Russo, Nunzio; Fino, Debora; Quadrelli, Elsje Alessandra; Pirone, Raffaele

doi:10.1016/j.apcatb.2017.03.010

Cited by 71 publications

(35 citation statements)

References 69 publications

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“…However, the soot particulate matter (PM) released from diesel engines has a severe impact on the environment and human health [3][4][5]. Trapping the soot PM in the exhaust using a diesel particulate filter (DPF) honeycomb, which is usually coated with an oxidation catalyst, has been shown to be an effective way to reduce pollution and has been applied in vehicles [6][7][8]. Presently, noble metals are most commonly used catalysts for soot oxidation, but their wide application is restricted by their limited availability and high cost.…”

Section: Introductionmentioning

confidence: 99%

Stable CuO/La2Sn2O7 catalysts for soot combustion: Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support

Feng

et al. 2021

Chinese Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

Stable CuO/La2Sn2O7 catalysts for soot combustion: Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support

Feng

et al. 2021

Chinese Journal of Catalysis

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“…Thus, the control of PM's emission is necessary for diesel engine future developments. Generally, there are two steps of PM's treatment: filtration and regeneration [28]. Filtration consists of capturing soot in a Diesel Particulate Filter (DPF), followed by the regeneration which refers to the combustion of soot at relatively high temperature (around 600 °C [29]) to avoid backpressure across the filter [25].…”

Section: Introductionmentioning

confidence: 99%

“…NOx-assisted soot oxidation is a simultaneous approach which involves NO to NO2 conversion and subsequent soot oxidation by the formed NO2 from the gas phase, at relatively low temperature [28]. Many works have investigated this reaction using noble metal catalysts, which are able to reduce the ignition temperature of soot oxidation (T10% -temperature when 10% of soot is combusted) down to 370 °C, depending on the operating conditions [28,[35][36][37][38]. However, no high NO2 yields of the soot oxidation reaction have been reported whereas a high proportion of NO2 is beneficial for further NOx elimination processes (for instance, NH3-SCR).…”

Section: Introductionmentioning

confidence: 99%

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Tran

Martinović

Ceretti

et al. 2020

Applied Catalysis A: General

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In the framework of nowadays challenges in the automotive catalysis, directed to the mitigation of pollution caused by the emissions of internal combustion engines, a series of LaAl1-xCoxO3 perovskites were investigated with the purpose of enhancing the oxidation of soot in the presence of NOx. Perovskite oxides LaAl1-xCoxO3 (x=0; 0.25; 0.5; 0.75 and 1) were synthesized by a solgel route and characterized by different methods: X-Ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), N2-sorption, O2/NOx-temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). The perovskite oxides were tested as catalysts for NO oxidation in isothermal mode and for NOx-assisted soot oxidation in temperature programmed reaction. Structural results reveal that Co is well incorporated in the perovskite structure expanding the unit cell, and doping Co may result in the distortion of the BO6 octahedra of the general ABO3 perovskite structure. An increase in Co substitution with x up to 0.75 remarkably promotes the oxidation activity, whereas total replacement of Al by Co degrades the catalytic performance. Among the prepared solids, LaAl0.25Co0.75O3 is the most active for NO oxidation, with a conversion of 78% at 320 °C, and it also exhibits the highest activity for NOxassisted soot oxidation, with a T10% of 377 °C while maintaining high NO2 production (71%). The outstanding performance of LaAl0.25Co0.75O3 is associated with the high mobility of lattice oxygen species and the role of surface adsorbed oxygen seems not to be prominent. The strong correlation of catalytic activity with NOx-TPD profiles suggests that NOx adsorption on catalyst surface is an essential step in soot oxidation. It is also shown that higher calcination temperature promotes the crystallinity of perovskite phase and leads to the improvement in the catalytic activity. The present work indicates that the prepared perovskite catalysts are competitive with noble-metal rivals for NOx-assisted soot oxidation and outperform them in NO2 production for further NOx abatement.

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“…As one of the main pollutants from diesel engine exhaust, soot particulate matters (PM) have severe harm to the air quality and human health [1][2][3]. Therefore, it is necessary to eliminate soot PM with effective exhaust treatment strategies [4][5][6]. For soot combustion, increasing the oxidation efficiency of soot PM trapped by the DPF filters at low temperatures over an active oxidation catalyst is one of the most effective ways [4].…”

Section: Introductionmentioning

confidence: 99%

Study on the Structure–Reactivity Relationship of LnMn2O5 (Ln = La, Pr, Sm, Y) Mullite Catalysts for Soot Combustion

Feng

Zhang

et al. 2020

Chemistry Africa

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To understand systematically the structure and reactivity relationship of AB 2 O 5 mullite catalysts under the same condition, and with the objective to obtain more feasible catalysts, a series of mullites with Mn cations at B site but with changed La 3+ , Pr 3+ , Sm 3+ and Y 3+ at A site were fabricated and applied to soot combustion, and characterized by different means. A pure phase orthorhombic mullite structure has been successfully formed in all the samples. However, the radius of the rare earth cations at A site can evidently influence the crystalline structures. As a result, the surface structure and reactivity of the samples can be impacted. A mullite catalyst with higher soot combustion activity generally owns a larger quantity of more reactive surface oxygen anions/sites, which results in a soot combustion activity sequence of SmMn 2 O 5 > YMn 2 O 5 > PrMn 2 O 5 > LaMn 2 O 5. In conclusion, the amount and reactivity of the surface active oxygen species control the soot oxidation activity of the mullite catalysts.

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Ceria-supported small Pt and Pt 3 Sn nanoparticles for NO x -assisted soot oxidation

Cited by 71 publications

References 69 publications

Stable CuO/La2Sn2O7 catalysts for soot combustion: Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support

Stable CuO/La2Sn2O7 catalysts for soot combustion: Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support

Co-doped LaAlO3 perovskite oxide for NOx-assisted soot oxidation

Study on the Structure–Reactivity Relationship of LnMn2O5 (Ln = La, Pr, Sm, Y) Mullite Catalysts for Soot Combustion

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