SmMn2O5 catalysts modified with silver for soot oxidation: Dispersion of silver and distortion of mullite

Jin, Baofang; Zhao, Baohuai; Liu, Shuang; Li, Zhenguo; Li, Kaixiang; Ran, Rui; Si, Zhichun; Weng, Duan; Wu, Xiaodong

doi:10.1016/j.apcatb.2020.119058

Cited by 70 publications

(40 citation statements)

References 57 publications

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“…Analogous to these findings, the redox ability of mullite oxides is shown to improve through the creation of heterointerfaces by adding Pt, Pd, and Ag for the oxidation of NO, CO, soot, and hydrocarbons. [ 81–84 ]…”

Section: Strategies To Optimize the Catalytic Performance Of Mullite mentioning

confidence: 99%

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Thampy

Ashburn

Cho

et al. 2021

Adv Energy and Sustain Res

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Driving innovations in the field of catalysis and electrocatalysis for a sustainable future necessitates the development of highly active, thermally stable, and low‐cost heterogeneous catalysts. Earth‐abundant transition metal‐based oxide catalysts are highly sought after to replace expensive platinum group metals. Identifying new catalyst formulations and design principles to tune materials’ bulk electronic structures and surface energetics for enhanced catalytic activity accelerates the search. Herein, the inherent attributes of mullite‐type oxides in catalyzing various oxidation reactions—crystal structure, electronic structure, stability, and catalytic activity—are reviewed. A comprehensive understanding of the nature of active sites, oxidation mechanisms, strategies to enhance the catalytic performance and regeneration of active sites, emerging opportunities in electrocatalysis and sensors, and challenges in computational methodologies is discussed. Finally, a perspective on expanding mullite‐type oxides’ viability for commercial applications in environmental and sustainable energy production through the integration of advanced synthetic approaches, operando spectroscopic techniques, and high‐throughput computational tools is outlined.

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Section: Strategies To Optimize the Catalytic Performance Of Mullite mentioning

confidence: 99%

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Thampy

Ashburn

Cho

et al. 2021

Adv Energy and Sustain Res

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“…In terms of the active components in the catalysts, they can be categorized into precious metal nanoparticles, 4 nonprecious metal (transition and alkali metal) oxides, 5−9 and rare earth oxides. 10,11 It is widely acknowledged that precious metals (Pt and Pd) remain the essentially active components in conventionally commercial catalysts for the purification of engine exhaust. However, they present expensive price, and their reserves are limited.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The catalytic after-treatment technique composed of catalysts and diesel particulate filter is an indispensable part for the purification of soot particles, and the purification efficiency of soot particles greatly counts on the performance of coated catalysts. , Over the past decades, the researchers have studied a mass of high-efficient catalysts for soot purification. In terms of the active components in the catalysts, they can be categorized into precious metal nanoparticles, nonprecious metal (transition and alkali metal) oxides, − and rare earth oxides. , It is widely acknowledged that precious metals (Pt and Pd) remain the essentially active components in conventionally commercial catalysts for the purification of engine exhaust. However, they present expensive price, and their reserves are limited .…”

Section: Introductionmentioning

confidence: 99%

Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La_2–xK_xNiCoO₆ Catalysts with an Ordered Macroporous Structure

Zhang

Mei

Zhao

et al. 2021

Environ. Sci. Technol.

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The catalytic performances for soot purification over the perovskite-type ABO3 oxides, as one of the most potential non-noble metal catalysts, are closely correlated with the substitution of A-site and B-site ions. Herein, three-dimensional ordered macroporous (3DOM) structural catalysts of double perovskite-type La2–x K x NiCoO6 were prepared by a method of colloidal crystal template. The contact efficiency between the catalyst and soot particles is significantly promoted by the 3DOM structure, and the partial substitution of A-site (La) with low-valence potassium (K) ions in La2–x K x NiCoO6 catalysts boosts the increasing surface density of coordinatively unsaturated active B-sites (Co and Ni) and active oxygen. 3DOM La2–x K x NiCoO6 catalysts exhibited superior performance during the purification of soot particles, and the 3DOM La1.80K0.20NiCoO6 catalyst exhibited the highest activity, that is, the values of T 50, S CO2, and turnover frequency are 346 °C, 99.3%, and 0.204 h–1 (at 300 °C), respectively. According to the results of multiple experimental characterizations and density functional theory calculations, the mechanism of the samples during soot removal is proposed: the increase in surface oxygen density induced by the doping of K ions significantly promotes the critical step of the oxidation from NO to NO2 in catalyzing soot purification. It is one new strategy to develop the high-efficient non-noble metal catalysts for soot purification in practical application.

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“…Silver is a catalyst with good catalytic performance and stability for soot combustion, which has been extensively studied because of its lower price compared with other precious metals. Different materials, including CeO 2 , [7] ZrO 2 , [8] Al 2 O 3 , [9] SiO 2 , [10] SnO 2 , [11] TiO 2 , [7e] ZnO [10b] ), Ce x Zr 1-x O 2 [2] and Ce x Nd 1-x O 2 [12] solid solutions, LaFeO 3 [13] and LaCoO 3 [14] perovskites, MgAl 2 O 4 [15] spinel, yttria-stabilized zirconia, [16] SmMn 2 O 5 [17] mullite, have been used as supports to load Ag for soot combustion. It has been commonly agreed that the catalytic performance depends not only on the chemical property of the precious metals, the loadings and the particle sizes, but also on the synergistic interaction between the supported components and the supports, which is well known as the metal-support interaction.…”

Section: Introductionmentioning

confidence: 99%

Metallic Ag Confined on SnO₂ Surface for Soot Combustion: the Influence of Ag Distribution and Dispersion on the Reactivity

et al. 2021

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To unravel the surface confinement effect of SnO 2 for Ag, and find an effective way to design practical soot combustion catalysts, an XRD extrapolation method has been adopted for the first time to analyze the distribution and dispersion of metallic Ag on SnO 2 surface. Ag addition can generate more surface oxygen vacancies on SnO 2 , thus forming richer amount of surface O 2 À and O 2 2À anions. However, the amount of soot reactive oxygen sites is significantly influenced by the distribution of Ag. It is quantified that 1.86 mmol Ag/100 m 2 SnO 2 surface, which is equal to 5.2 wt% loading, is a threshold value for Ag distribution. Below the threshold, Ag is nearly in amorphous state, and has strong interaction with the SnO 2 support, thus producing more soot reactive surface oxygen sites. Furthermore, the redox property of SnO 2 lattice oxygen is enhanced by Ag addition. Therefore, metallic Ag in nearly amorphous state plays a critical role for the reaction. Ag crystallites formed on the surface above the threshold have negative influence on the activity. The best Ag/SnO 2 catalyst can be fabricated by loading the threshold amount of Ag over SnO 2 surface to get the maximum quantity of amorphous Ag species.

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SmMn2O5 catalysts modified with silver for soot oxidation: Dispersion of silver and distortion of mullite

Cited by 70 publications

References 57 publications

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La_2–xK_xNiCoO₆ Catalysts with an Ordered Macroporous Structure

Metallic Ag Confined on SnO₂ Surface for Soot Combustion: the Influence of Ag Distribution and Dispersion on the Reactivity

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SmMn2O5 catalysts modified with silver for soot oxidation: Dispersion of silver and distortion of mullite

Cited by 70 publications

References 57 publications

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La2–xKxNiCoO6 Catalysts with an Ordered Macroporous Structure

Metallic Ag Confined on SnO2 Surface for Soot Combustion: the Influence of Ag Distribution and Dispersion on the Reactivity

Contact Info

Product

Resources

About

Boosting Catalytic Purification of Soot Particles over Double Perovskite-Type La_2–xK_xNiCoO₆ Catalysts with an Ordered Macroporous Structure

Metallic Ag Confined on SnO₂ Surface for Soot Combustion: the Influence of Ag Distribution and Dispersion on the Reactivity