Perovskite-type oxides synthesized by reactive grinding

Kaliaguine, Serge; Neste, A. Van; Szabó, Veronika; Gallot, J.E.; Bassir, M.; Muzychuk, R.

doi:10.1016/s0926-860x(00)00779-1

Cited by 233 publications

(140 citation statements)

References 21 publications

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“…In LaNiO 3 catalyst, the carbonate quantity is bigger, when compared to another catalyst, due to the catalyst has been stayed more time during the filtration process (72 h), once fine grain was formed, difficulting the filtration process. The oxides at low temperatures present typical structure of perovskite (Figure 2), what can be confirmed comparing with standard archives JCPDS and literature [13][14][15]. The catalyst LaNiO 3 and LaCoO 3 presented rhombohedrical structure and the LaMnO 3 presented orthorhombic structure.…”

Section: Resultssupporting

confidence: 79%

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Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Silva

Soares

2009

Eclet. Quím.

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IntroductionThe removal of CO, unburned hydrocarbons (HC), and NO from automotive exhaust requires catalytic devices in which these pollutants are eliminated. Catalytic combustion offers one of the most efficient means for controlling atmospheric pollution (1). Although noble metals, such as palladium, platinum, and Rhodium are well known with higher activity (per site than metal-oxide catalysts, they present several disadvantages, such as higher volatility, high cost, and poor availability. Compared with noble metals, base metal catalysts present a lower but still sufficient activity as oxidation catalysts, and have the advantages of lower costs and the potential market in energy generation systems in domestic and small scale industrial applications. For this reason perovskite type compounds have received wide attention, which have been incorporated into the design of the novel combustors (2,3).A perovskite-type oxide has an ABO 3 type crystal structure wherein cations with a large ionic radius have twelve coordination to oxygen atoms and occupy A-sites, and occupy B sites. A and O form a cubic closest packing, and B is contained in the octahedral voids in the packing. If the ionic radii are r A , r B and r O , to form a perovskite crystal structure, the tolerance factor (t) = (r A + r O )/ (r B + r O ) must lie within the range 0.8 < Abstract:The perovskite-type oxides using transition metals present a promising potential as catalysts in total oxidation reaction. The present work investigates the effect of synthesis by oxidant co-precipitation on the catalytic activity of perovskite-type oxides LaBO 3 (B= Co, Ni, Mn) in total oxidation of propane and CO. The perovskite-type oxides were characterized by means of X-ray diffraction, nitrogen adsorption (BET method), thermo gravimetric and differential thermal analysis (ATG-DTA) and X-ray photoelectron spectroscopy (XPS). Through a method involving the oxidant co-precipitation it's possible to obtain catalysts with different BET surface areas, of 33-44 m 2 /g, according the salts of metal used. The characterization results proved that catalysts have a perovskite phase as well as lanthanum oxide, except LaMnO 3 , that presents a cationic vacancies and generation for known oxygen excess. The results of catalytic test showed that all oxides have a specific catalytic activity for total oxidation of CO and propane even though the temperatures for total conversion change for each transition metal and substance to be oxidized.

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Section: Resultssupporting

confidence: 79%

“…LaNiO 3 started the conversion near 300ºC that is a high temperature when compared to the others catalysts. The good conversion is mentioned to the LaCoO 3 by Shu & Kaliaguine [13].…”

Section: Resultsmentioning

confidence: 98%

Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Silva

Soares

2009

Eclet. Quím.

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“…The characterisation of materials for SOFCs [10,11] also allowed concluding that oxygen diffusion is faster along the grain boundaries than in the crystal bulk. In addition, we recently described a method, based on TPR and TPD analysis, to evaluate oxygen non-stoichiometry for LaCoO 3±δ samples.…”

Section: Introductionmentioning

confidence: 99%

Oxygen transport in nanostructured lanthanum manganites

Rossetti

Allieta

Biffi

et al. 2013

Phys. Chem. Chem. Phys.

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Methods and models describing oxygen diffusion and desorption in oxides have been developed for slightly defective and well crystallised bulky materials. Does nanostructuring change the mechanism of oxygen mobility? In such a case, models should be properly checked and adapted to take into account new material properties.In order to do so, temperature programmed oxygen desorption and thermogravimetric analysis, either in isothermal or ramp mode, have been used to investigate some nanostructured La 1-x A x MnO 3±δ samples (A=Sr and Ce, 20-60 nm particle size) with perovskite-like structure. The experimental data have been elaborated by means of different models to define a set of kinetic parameters able to describe oxygen release properties and oxygen diffusion through the bulk. Different rate-determining steps have been identified, depending on the temperature range and oxygen depletion of the material. In particular, oxygen diffusion shows rate-limiting at low temperature and with low defect concentration, whereas oxygen recombination at the surface seems to be the rate-controlling step at high * Corresponding author: Fax: +39-02-50314300; e-mail: ilenia.rossetti@unimi.it 2 temperature. However, the oxygen recombination step is characterised by an activation energy much lower than that for diffusion.In the present paper oxygen transport in nanosized materials is quantified by making use of widely diffused experimental techniques and by critically adapting to nanoparticles suitably chosen models developed for bulk materials.

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“…Synthesis of LaCoO 3 has been achieved with a number of methods, including a sol-gel method [8,9], a poly-merizable complex method [10], combustion synthesis [11], molten chloride flux [12], mechanochemical synthesis [13], alkaline co-precipitation [14], and electrochemical oxidation [15]. The properties of the final materials obtained are highly dependent on the preparation method [12][13][14][15][16]. The reverse micro emulsion, which is also known as W/O (water in oil) micro emulsion method, is a recently developed technique, ideal for the preparation of inorganic nanoparticles [17].…”

Section: Introductionmentioning

confidence: 99%

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Islam

Jeong

Ghani

et al. 2015

Journal of Electrochemical Science and Technology

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The micro emulsion method has been successfully used for preparing perovskite LaCoO 3 with uniform, fine-shaped nanoparticles showing high activity as electro catalysts in oxygen reduction reactions (ORRs). They are, therefore, promising candidates for the air-cathode in metal-air rechargeable batteries. Since the activity of a catalyst is highly dependent on its specific surface area, nanoparticles of the perovskite catalyst are desirable for catalyzing both oxygen reduction and evolution reactions. Herein, LaCoO 3 powder was also prepared by sol-gel method for comparison, with a broad particle distribution and high agglomeration. The electro catalytic properties of LaCoO 3 and LaCoO 3 -carbon Super P mixture layers toward the ORR were studied comparatively using the rotating disk electrode technique in 0.1 M KOH electrolyte to elucidate the effect of carbon Super P. Koutecky-Levich theory was applied to acquire the overall electron transfer number (n) during the ORR, calculated to be ~3.74 for the LaCoO 3 -Super P mixture, quite close to the theoretical value (4.0), and 2.7 for carbon-free LaCoO 3 . A synergistic effect toward the ORR is observed when carbon is present in the LaCoO 3 layer. Carbon is assumed to be more than an additive, enhancing the electronic conductivity of the oxide catalyst. It is suggested that ORRs, catalyzed by the LaCoO 3 -Super P mixture, are dominated by a 2+2-electron transfer pathway to form the final, hydroxyl ion product.

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Perovskite-type oxides synthesized by reactive grinding

Cited by 233 publications

References 21 publications

Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Oxygen transport in nanostructured lanthanum manganites

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

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Perovskite-type oxides synthesized by reactive grinding

Cited by 233 publications

References 21 publications

Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Lanthanum based high surface area perovskite-type oxide and application in CO and propane combustion

Oxygen transport in nanostructured lanthanum manganites

Micro Emulsion Synthesis of LaCoO3Nanoparticles and their Electrochemical Catalytic Activity

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Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity