Silver-modified manganite and ferrite perovskites for catalyzed gasoline particulate filters

Hernández, Willinton Y.; López-González, D.; Ntais, Spyridon; Zhao, Chunhua; Boréave, A.; Vernoux, P.

doi:10.1016/j.apcatb.2017.12.029

Cited by 52 publications

(81 citation statements)

References 55 publications

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“…On the other hand, an additional XRD pattern at 44.3 • on the diffractogramm of LSACO-4 and LSACO-5, corresponding to (2 0 0) planes of fcc metallic silver, proves the presence of metallic Ag, out of the perovskite structure. These results demonstrate the limited solubility of Ag in the perovskite in agreement with previous studies [32]. For high contents of Ag, reaching 25 at.…”

Section: Preparation and Characterization Of La 1-x-y Sr X Ag Y Coo 3supporting

confidence: 93%

“…The partial substitution of La 3+ cations by Sr 2+ ones improves the thermal stability and then the specific surface area of pure LaCoO 3 [29] and also enhances the surface concentration of oxygen vacancies involved in the oxidation catalytic mechanism [30]. The partial substitution of La 3+ by Ag + can also increase the catalytic properties of lanthanum cobaltites for oxidation reactions due to the formation of oxygen vacancies [31] and the stabilisation of Ag nanoparticles on the oxide surface [6,32]. The different parameters (intensities of current applied on the metallic targets, total pressure in the chamber, oxygen partial pressure, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering

et al. 2019

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Lanthanum perovskites are promising candidates to replace platinum group metal (PGM), especially regarding catalytic oxidation reactions. We have prepared thin catalytic coatings of Sr and Ag doped lanthanum perovskite by using the cathodic co-sputtering magnetron method in reactive condition. Such development of catalytic films may optimize the surface/bulk ratio to save raw materials, since a porous coating can combine a large exchange surface with the gas phase with an extremely low loading. The sputtering deposition process was optimized to generate crystallized and thin perovskites films on alumina substrates. We found that high Ag contents has a strong impact on the morphology of the coatings. High Ag loadings favor the growth of covering films with a porous wire-like morphology showing a good catalytic activity for CO oxidation. The most active composition displays similar catalytic performances than those of a Pt film. In addition, this porous coating is also efficient for CO and NO oxidation in a simulated Diesel exhaust gas mixture, demonstrating the promising catalytic properties of such nanostructured thin sputtered perovskite films.

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Section: Preparation and Characterization Of La 1-x-y Sr X Ag Y Coo 3supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering

et al. 2019

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“…For this reason, representative catalysts were studied as well by mixing the soot and the respective catalyst powder, under intimate contact in an agate mortar, for 10 min. to improve the soot/catalyst agglomerate contact [35]. The O2 evolving from the catalysts and the soot combustion products (CO2 and CO) were continuously recorded with MS analysis.…”

Section: Soot Combustion Testsmentioning

confidence: 99%

Lattice oxygen activity in ceria-praseodymia mixed oxides for soot oxidation in catalysed Gasoline Particle Filters

Martínez-Munuera

Zoccoli

Giménez-Mañogil

et al. 2019

Applied Catalysis B: Environmental

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Two series of ceria-praseodymia catalysts with varying composition have been systematically investigated in the oxidation of soot under inert atmosphere in order to find out its potential utilization in Gasoline Particulate Filters for GDI engines. The samples have been widely characterized by XRD, Raman spectroscopy, TEM, FESEM, XPS, N2 adsorption at-196 o C and O2-TPD. The praseodymium incorporation onto the ceria enhances the oxygen mobility in the subsurface/bulk of the sample favoring higher O2 released amounts under inert atmosphere. The intermediate compositions can promote more accentuated O2 emissions at moderate temperatures (up to 500 o C). The efficiency of the own active oxygen species released from the catalyst to oxidize soot under inert atmosphere, even under loose contact mode, has been well demonstrated. The pathways of the mechanism taking place seem to be dependent on the temperature and mainly on the type of contact among soot and catalyst. Under loose contact conditions and lowmedium temperatures, the O2 freshly emitted from the catalyst can oxidize soot more efficiently than a diluted O2-gas stream. Conversely, under more severe conditions (higher temperature or tight contact conditions), the soot acts as a "driving force" and the own lattice oxygen species can be transferred directly towards soot surface in an efficient way.

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“…Song et al 114 indicated that Ag-doping of LaMnO 3 , LaCoO 3 , LaFeO 3 , LaNiO 3 and LaFe 0.5 Co 0.5 O 3 perovskites significantly increased catalytic activity in methane combustion. Hernández et al 122 synthesized Ag-modified manganite (LaSrAgMn) and ferrite (LaSrAgFe) perovskites with variable Ag loadings for catalysed gasoline particulate filters. In silver-containing catalysts, a notable increase in activity per unit SA occurred over 800 K, where a new O 2 source surface was revealed.…”

Section: Pd-doped Perovskite Catalystsmentioning

confidence: 99%

“…Rong et al 121 prepared Ag-doped LaFeO 3 by using a sol-gel method combined with molecularly imprinted technology as precursors for using as a sensitive methanol gas sensor. Hernández et al 122 synthesized Ag-modified manganite (LaSrAgMn) and ferrite (LaSrAgFe) perovskites with variable Ag loadings for catalysed gasoline particulate filters.…”

Section: Ag-doped Perovskite Catalystsmentioning

confidence: 99%

Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

Başhan

Üst

2019

Int J Energy Res

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Summary This review underlines the importance of the developments in perovskite catalysts for methane combustion from the past up to the present. In this review, after a general and brief introduction to perovskites, the mechanisms of catalytic combustion of methane have been included. Moreover, current studies on perovskites have been summarized including the effects of substitutions, doped perovskites, perovskite preparation methods, and the effect of sulfur presence on perovskite catalysts. Besides, recent studies on perovskite oxides and phenomenon of oxygen (O2) deficiency, porous perovskite oxides, and nanostructured perovskites have been conducted. In addition, partial oxidation of methane (POM) has been reviewed. The loss of active component during the POM reaction can take place in the nickel catalyst, in particular. Since nickel has a lower melting point than noble metals and other active components, such as Co and Fe, in general, to deactivate nickel is easier. Compared with conventional structure, the porous structure with the unique morphology significantly enhances the catalytic activity through a much larger surface area (SA) and greater reactivity of the active sites. Furthermore, the monolithic nanoarrayed perovskite presents very good results in well‐defined faceted catalysts and takes part in porous channel hydrocarbon combustion. This review study is prepared as a guide to cover the profound knowledge of perovskite oxides catalysts, considering the methane combustion reaction mechanisms, and addresses prospective studies in this field for researchers.

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Silver-modified manganite and ferrite perovskites for catalyzed gasoline particulate filters

Cited by 52 publications

References 55 publications

Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering

Catalytic Properties of Double Substituted Lanthanum Cobaltite Nanostructured Coatings Prepared by Reactive Magnetron Sputtering

Lattice oxygen activity in ceria-praseodymia mixed oxides for soot oxidation in catalysed Gasoline Particle Filters

Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

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