Perovskite-like La1−xKxMnO3 and related compounds: Solid state chemistry and the catalysis of the reduction of NO by CO and H2

Voorhoeve, R. J. H.; Remeika, J. P.; Trimble, L. E.; Cooper, A. S.; DiSalvo, Francis J.; Gallagher, P. K.

doi:10.1016/0022-4596(75)90061-4

Cited by 145 publications

(50 citation statements)

References 29 publications

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“…Perovskites as support for noble metal are known to be active since they were first used by Voorhoeve et al [4] but their low specific surface area (SSA), as well as, bulk and surface heterogeneity were an impediment to further practical developments despite a well known high thermal stability. New synthesis routes lead to significant improvement on specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Thermal Ageing Induced Effects on Pd/LaFeO3 for NOx Reduction by Hydrocarbons: Influence of the Preparation Method

Miquel

Yamin²,

Lombaert

et al. 2009

Top Catal

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The influence of the support synthesis for the preparation of supported Pd/LaFeO 3 perovskite based catalysts and the nature of the palladium precursor on the catalytic performances in the selective reduction of NO to N 2 by hydrocarbons have been investigated. According to the preparation method, subsequent surface and bulk characterisation revealed significant changes in the degree of dispersion and the chemical environment of oxidic palladium species depending on the extent of interaction with the support. Pd nitrate precursor leads to the stabilisation of the Pd surface concentration. The metal support interactions thus obtained strongly enhance the catalytic performances, particularly the resistance to thermal ageing whereas sol-gel synthesis produces the higher support activity.

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Section: Introductionmentioning

confidence: 99%

Thermal Ageing Induced Effects on Pd/LaFeO3 for NOx Reduction by Hydrocarbons: Influence of the Preparation Method

Miquel

Yamin²,

Lombaert

et al. 2009

Top Catal

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“…Nitadori et al [31], as well as Panich et al [32], did not observe significant activity differences between Y-, La-, Pr-, Nd-, Sm-, Eu-, and Gd-based cobaltates tested in the oxidation of propane, methanol, CO, ethylbenzene, and propylene ( Figure 1). However, partial substitution at the A-site by a cation of different valence (e.g., substitution of La 3+ by Sr 2+ or K + ) can form oxygen vacancies and/or change the oxidation state of the B-site cation, which enhances substancially the catalytic properties of the material [31,33]. Detailed review concerning the effects of substitution on the CO oxidation activity of perovskite-type oxides can be found in reference [27].…”

Section: Parameters Influencing the Catalytic Activitymentioning

confidence: 99%

“…CO 2(ads) → CO 2(g) (10) NO reduction takes place following an intrafacial mechanism [9,25,33,53,54]. NO dissociatively adsorbs on a surface oxygen vacancy (□) (Equation (11)).…”

Section: Reaction Mechanismsmentioning

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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“…(4) Another advantage is the ability to control valencies and vacancies to enhance the catalytic activity [10,12,15,19]. (5) Addition of precious metals to perovskites improves the activity of three-way catalysts for NOx reduction [26][27][28].…”

Section: History Of Research On Perovskite Catalystsmentioning

confidence: 99%

An Intelligent Catalyst: The Self-Regenerative Palladium–Perovskite Catalyst for Automotive Emissions Control

Tanaka¹

2005

Catal Surv Asia

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An innovative ÔÔintelligent catalystÕÕ that exhibits a greatly improved durability as a result of the self-regenerative function of Pd nanoparticles has been developed. Self-regeneration was realized through a cycle between solid solution and segregation of Pd in a perovskite crystal, without any auxiliary treatment. That is, Pd atoms move back and forth between the inside (as Pd cations in the lattice) and the outside (as Pd nanoparticles) of the perovskite crystal in synchronization with the fluctuations between reductive and oxidative (redox) atmospheres that occur in real automotive exhaust gases. As a result of this cyclic redox reaction, the growth of Pd nanoparticles can be suppressed during the entire lifetime of the vehicle. This self-regenerative function provides a new and useful tool for the development of future automotive catalysts. The mechanism of the self-regenerative function is described, and it is shown by ex situ and in situ X-ray absorption fine-structure spectroscopic analyses that the self-regenerative function occurs at an extremely high speed over a wide range of temperatures. In addition, technical solutions for overcoming the weaknesses of general perovskite catalysts for practical use are described.

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Perovskite-like La1−xKxMnO3 and related compounds: Solid state chemistry and the catalysis of the reduction of NO by CO and H2

Cited by 145 publications

References 29 publications

Thermal Ageing Induced Effects on Pd/LaFeO3 for NOx Reduction by Hydrocarbons: Influence of the Preparation Method

Thermal Ageing Induced Effects on Pd/LaFeO3 for NOx Reduction by Hydrocarbons: Influence of the Preparation Method

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

An Intelligent Catalyst: The Self-Regenerative Palladium–Perovskite Catalyst for Automotive Emissions Control

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