Effect of complexing species in a sol–gel synthesis on the physicochemical properties of La0.7Sr0.3Mn0.7Cu0.3O3+λ catalyst

Ran, Rui; Wu, Xiaodong; Weng, Duan

doi:10.1016/j.jallcom.2005.03.120

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Bonne et al reported that lattice oxygen mobility of LaCoO 3 doubled when its particle size was reduced to <5 nm . Ran et al reported that the structural defects and reducibility of La 0.7 Sr 0.3 Mn 0.7 Cu 0.3 O 3+δ can be controlled by changing the macrostructure of materials …”

Section: Perovskites As Oxygen Storage Materials In Three-way Catalysismentioning

confidence: 99%

“…177 Ran et al reported that t h e s t r u c t u r a l d e f e c t s a n d r e d u c i b i l i t y o f La 0.7 Sr 0.3 Mn 0.7 Cu 0.3 O 3+δ can be controlled by changing the macrostructure of materials. 155 The formation of three-dimensionally ordered macroporous structure for the perovskite catalysts can significantly increase the concentration of active surface oxygen species, 163,178,179 improve the activity of lattice oxygen, 162,180 and enhance the reducibility of the catalysts, 178,179,181 which can explain the enhancement of the catalytic activity for CO or HCs oxidations. Enhanced reducibility and catalytic activity were also observed on the mesoporous perovskite oxides prepared by the organic template decomposition method or vinyl silica template method.…”

Section: Perovskites As Oxygen Storage Materialsmentioning

confidence: 99%

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Perovskites as Geo-inspired Oxygen Storage Materials for Chemical Looping and Three-Way Catalysis: A Perspective

et al. 2018

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With highly tunable composition, structure, and chemical-physical properties, perovskite oxides represent a large family of mixed-oxide materials that finds many energyand environment-related applications. This perspective discusses the fundamentals and applications of perovskite oxides in the context of chemical looping and three-way catalysis (TWC). Both applications make use of perovskite oxides' oxygen storage and donation properties (>400 μmol O/g) under macroscopic reduction−oxidation (redox) cycles and at elevated temperatures. While perovskite oxides have been investigated as oxygen storage materials (OSMs) and three-way catalysts for more than five decades, use of these oxides in chemical looping, as oxygen carriers or redox catalysts, is a relatively new topic. This article provides an account of the effects of compositional, structural, and surface properties of perovskites on their oxygen storage and donation properties as well as their interactions with various gaseous reactants. Design and optimization strategies of tailored perovskite OSMs for chemical looping and TWC are discussed. Emerging applications of perovskite-based redox catalysts for chemical looping partial oxidation are also covered.

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Section: Perovskites As Oxygen Storage Materials In Three-way Catalysismentioning

confidence: 99%

Section: Perovskites As Oxygen Storage Materialsmentioning

confidence: 99%

Perovskites as Geo-inspired Oxygen Storage Materials for Chemical Looping and Three-Way Catalysis: A Perspective

et al. 2018

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“…For example, the TWC activity of La 0.7 Sr 0.3 Mn 0.7 Cu 0.3 O 3−δ prepared by complexation of nitrate salts in the presence of citric acid and ammonia is strongly affected by the acid-to-ammonia ratio employed for the synthesis [40] since it affects the polymerization of the precursor molecules. The catalytic performance of perovskite-type oxides is well-known to increase with their Specific Surface Area (SSA) [11,23] which can often be very low.…”

Section: Figurementioning

confidence: 99%

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains a critical research topic owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals. Among other material classes, perovskite-type oxides are known to be valuable alternatives to conventionally used TWC compositions and have demonstrated to be suitable for a wide range of automotive applications, ranging from TWC to Diesel Oxidation Catalysts (DOC), from NO x Storage Reduction catalysts (NSR) to soot combustion catalysts. The interest in these catalysts has been revitalized in the past ten years by the introduction of the concept of catalyst regenerability of perovskite-based TWC, which is in principle well applicable to other catalytic processes as well, and by the possibility to reduce the amounts of critical elements, such as precious metals without seriously lowering the catalytic performance. The aim of this review is to show that perovskite-type oxides have the potential to fulfil the requirements (high activity, stability, and possibility to be included into structured catalysts) for implementation in TWC.

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“…8 The solution was stirred for 1 h and concentrated by evaporating water at 80 • C to obtain the formation of a gel, which has been subsequently dried at 200-250 • C in air to obtain an amorphous precursor [10][11][12][13]. TG analysis under air shows no weight loss above 700 • C, but the powders were heated in air at 1000 • C for 12 h in order to obtain dense particles with the perovskite structure.…”

Section: Powder Synthesismentioning

confidence: 99%

Elaboration of La0.8Sr0.2Fe0.7Ga0.3O3−δ/La0.8M0.2FeO3−δ (M=Ca, Sr and Ba) asymmetric membranes by tape-casting and co-firing

Julian

Juste

Geffroy

et al. 2009

Journal of Membrane Science

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Effect of complexing species in a sol–gel synthesis on the physicochemical properties of La0.7Sr0.3Mn0.7Cu0.3O3+λ catalyst

Cited by 8 publications

References 23 publications

Perovskites as Geo-inspired Oxygen Storage Materials for Chemical Looping and Three-Way Catalysis: A Perspective

Perovskites as Geo-inspired Oxygen Storage Materials for Chemical Looping and Three-Way Catalysis: A Perspective

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Elaboration of La0.8Sr0.2Fe0.7Ga0.3O3−δ/La0.8M0.2FeO3−δ (M=Ca, Sr and Ba) asymmetric membranes by tape-casting and co-firing

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