Influence of the synthesis method on the structure of Pd-substituted perovskite catalysts for methane oxidation

Lu, Yonglai; Eyssler, Arnim; Otal, Eugenio H.; Matam, Santhosh Kumar; Brunko, Oliver C; Weidenkaff, Anke; Ferri, Davide

doi:10.1016/j.cattod.2012.10.026

Cited by 39 publications

(32 citation statements)

References 39 publications

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“…After the partial substitution of lanthanum or manganese by palladium in the LaMnO 3 perovskites the increase in their activity in the oxidation of carbon monoxide is caused by the PdO or PdO/ Pd 0 dispersed on the surface of the perovskites and depends on the palladium concentration on the catalyst surface. The results obtained in this study are in agreement with the ones reported by Eyssler et al [21] and Lu et al [11].…”

Section: Resultssupporting

confidence: 83%

“…The XRD patterns of monolithic catalysts with LaMn 1-x Pd x O 3 x = 0.1 and 0.15 perovskites calcined at 800 and 850°C for 4 h display the LaMnO 3.1 phase, PdO and Fe-Cr peaks. On the surface of the catalysts which [11]. In the case of perovskites obtained by the 6-h calcination of metal nitrates at 750°C, the conversion of CO increased when Pd content was raised from 0.05 to 0.2 mol (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The activity of a threeway automotive exhaust catalyst with the same palladium loading is significantly higher with Pd deposited on the LaFe 0.8 Co 0.2 O 3 perovskite-type oxide than with Pd substituted for iron in the LaFe 0.77 Co 0.17 Pd 0.06 O 3 perovskite [9]. The activity of Pd-doped perovskites is strongly influenced by the method of their preparation [11].…”

Section: Introductionmentioning

confidence: 97%

“…Such substitution changes the properties of the perovskite by inducing structural and electronic defects, which contribute to the perovskite's non-stoichiometry and thus considerably improve its catalytic activity [2,4]. The catalytic properties of the perovskite can be improved by partial substitution of the metal in position A or B with cations of noble metals: silver [3,5], platinum [6,7] or palladium [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Oxidation of Carbon Monoxide on Pd-Containing LaMnO3 Perovskites

Kucharczyk

2015

Catal Lett

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The substitution of 0.05 mol La with Pd enhances the activity of the LaMnO 3 in CO oxidation. La 0.9 Pd 0.1 MnO 3 and La 0.85 Pd 0.15 MnO 3 catalysts exhibit a very high activity, which depends on the conditions of perovskite preparation. Monolithic catalysts display a higher activity during CO oxidation when based on La 1-x Pd x MnO 3 than LaMn 1-x Pd x O 3 perovskites. The activity of the catalysts is determined by the concentration of palladium on the catalyst surface, which increases as the precursor calcination temperature is raised from 650 to 800°C. The size of the specific surface area of the perovskites has smaller influence on the activity of the catalysts. Graphical Abstract

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Catalytic Oxidation of Carbon Monoxide on Pd-Containing LaMnO3 Perovskites

Kucharczyk

2015

Catal Lett

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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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