Influence of the preparation conditions on the properties of perovskite-type oxide catalysts

Hackenberger, M.; Stephan, K.; Kießling, D.; Schmitz, W.; Wendt, G.

doi:10.1016/s0167-2738(97)00174-4

Cited by 16 publications

(8 citation statements)

References 6 publications

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“…The performance does not only depend on the phase composition of the mixed oxide but also on the preparation procedure and its parameters, as these affect the crystallinity, texture and morphology of the final material [34][35][36][37][38][39]. 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.…”

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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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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“…On the other hand, it has been reported by previous studies [7,18,21,22] that the substituted perovskites showed an enhanced reducibility in low and medium temperature ranges as compared with the non-substituted perovskites because of their excess oxygen and/or B-site synergistic effect. For the sample IV, it is possible to partially form the La 3+ Mn 3+ O 3−δ perovskite structure with some segregation of Sr and Cu.…”

Section: Effect On Physicochemical Properties Of the Catalystsmentioning

confidence: 77%

“…4c. As we know, the LaMnO 3−δ perovskite structure has larger theoretical lattice parameters in JCPDS and less structure defaults than La 0.7 Sr 0.3 Mn 0.7 Cu 0.3 O 3+λ with A x A 1−x B y B 1−y O 3±λ structure [7,18]. Thus, it is implied by the constriction of the crystal lattice of the sample II that more structural defaults may be induced in this procedure.…”

Section: Effect On Physicochemical Properties Of the Catalystsmentioning

confidence: 99%

“…Thus, by replacing part of A-or Bsite with A and B ions to form A x A 1−x B y B 1−y O 3±λ structure, it is possible to create oxygen vacancies in the perovskite oxides and exhibit high catalytic oxidation activity, especially for LaMnO 3 -and LaCoO 3 -based perovskites [5,6]. In particular, the catalytic activity of Sr-doped LaMnO 3 perovskite was supposed to be comparable with that of Pt/Al 2 O 3 catalyst [7].…”

Section: Introductionmentioning

confidence: 99%

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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

Ran

Weng

2006

Journal of Alloys and Compounds

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“…One of the most important factors for the catalytic activity of perovskite-type (ABO 3 ) catalysts is preparation methods, and good preparation results in high catalytic activity of catalysts [1]. The preparation methods include the pyrolytic process [2], co-precipitation method [3], ceramic method [4], spray freeze-drying [5], spray drying method [6], citrate acid complexation method [7], sol-gel method [8], impregnation method [9] and so on.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic performance of La0.8Sr0.2CoO3 supported on the mullite fiber ceramic

Zeng

Yan-chun

Liu

et al. 2007

Front. Chem. Eng. China

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The perovskite-type La 0.8 Sr 0.2 CoO 3 supported on the mullite fiber porous ceramics was prepared by means of the impregnating method, and was then characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD); thus we can come to the conclusion that the perovskitetype composite oxidant can disperse on the surface of mullite fiber ceramics. The catalytic activity of the La 0.8 Sr 0.2 CoO 3 for NO and CO was evaluated. The effect of the doped 0.1 wt-% PdCl 2 on the catalytic activity of the perovskite-type La 0.8 Sr 0.2 CoO 3 was also discussed. The results show that the conversion rates of NO and CO respectively reaches 74.5% and 99% at 601°C without doped Pd, and both reach 100% at 350°C with a little doped Pd.

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Influence of the preparation conditions on the properties of perovskite-type oxide catalysts

Cited by 16 publications

References 6 publications

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

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

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

Preparation and catalytic performance of La0.8Sr0.2CoO3 supported on the mullite fiber ceramic

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