Lanthanum ferrite LaFeO3+d nanopowders obtained by the polymerizable complex method

Popa, Mónica; Frantti, Johannes; Kakihana, Masato

doi:10.1016/s0167-2738(02)00480-0

Cited by 160 publications

(79 citation statements)

References 22 publications

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“…The number of catalysts used in modern chemical industries are based on mixed oxide including perovskite oxide ABO 3 where A is a rare earth element, B is 3d transition metals remain predominant [6] perovskite oxides crystals can have broad applications in advanced technologies such as catalysts, oxide fuel cell, chemical sensors, magnetic materials, electrode materials [7][8][9]. Perovskites, especially LaMnO 3 , have also been used in environmental applications, e.g., the oxidation of hydrocarbons [10][11][12], chlorinated organics [13] and H 2 O 2 reactions [14]. LaMnO 3 shows good stability, flexible oxygen stoichiometry (δ) and the different Mn oxidation states i.e., Mn 2+ , Mn 3+ , Mn 4+ , which strongly affects the catalytic behavior.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Lamn1-XFexO3 (X=0, 0.1, 0.2) by Coprecipitation Route

Geetha¹,

Kumar²,

Prakash³

2018

J Phys Chem Biophys

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Lamn1-XFexO3 (X=0, 0.1, 0.2) by Coprecipitation Route

Geetha¹,

Kumar²,

Prakash³

2018

J Phys Chem Biophys

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“…The heating at 90 °C over 7 hours resulted in a viscous orange resin. 12 This resin was then treated at 400-450 °C in air over 2 hours for the carbonization. The final product, a dark brown powder, was ground and then calcined at 800 °C in air for 6 hours.…”

Section: Methodsmentioning

confidence: 99%

“…Perovskites, especially LaMnO 3 , have also been used in environmental applications, e.g. the oxidation of hydrocarbons [8][9][10] , chlorinated organics 11 and H 2 O 2 reactions 6,12 . LaMnO 3 shows good stability, flexible oxygen stoichiometry (δ) and the different Mn oxidation states i.e.…”

Section: Introductionmentioning

confidence: 99%

LaMn1-xFe xO3 and LaMn0.1-xFe0.90Mo x O3 perovskites: synthesis, characterization and catalytic activity in H2O2 reactions

et al. 2008

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In this work two perovskites were prepared: LaMn 1-x Fe x O 3 , and LaMn 0.1-x Fe 0.90 Mo x O 3 . XRD and Mössbauer spectroscopy suggest the formation of pure phase perovskite with the incorporation of Fe and Mo in the structure. The catalytic activity of these materials was studied in two reactions with H 2 O 2 : the decomposition to O 2 , and the oxidation of the model organic contaminant methylene blue. The perovskite composition strongly affects the catalytic activity, while Fe decreases the H 2 O 2 decomposition Mo strongly improves dye oxidation.

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“…The prolonged heating at 90 °C occurred over 7 h and resulted in a viscous orange mass. 12 This resin was then treated at 400-450 °C in air over 2 h for carbonization. The final product, a dark brown powder, was ground and then calcined at 800 °C in air for 6 h. The catalysts were characterized by powder XRD, TPR (temperature programmed reduction), Mössbauer spectroscopy, BET surface area determination and thermal analysis.…”

Section: Methodsmentioning

confidence: 99%

“…the oxidation of hydrocarbons, [8][9][10] chlorinated organics 11 and H 2 O 2 reactions. 6,12 LaMnO 3 shows good stability and flexible oxygen stoichiometry ( ) with different Mn oxidation states, i.e. Mn 2+ , Mn 3+ , Mn 4+ , which strongly affects the catalytic behavior.…”

Section: Introductionmentioning

confidence: 99%

LaFe xMn yMo zO 3 catalysts for the oxidation of volatile aromatic organic contaminants

Tristão¹,

Ardisson²,

Macedo³

et al. 2007

J. Braz. Chem. Soc.

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Novas perovskitas mistas LaFe x Mn y Mo z O 3 foram preparadas, caracterizadas e investigadas como catalisadores para a oxidação total de tolueno, usado como composto orgânico aromático volátil (COV aromático) modelo. As perovskitas foram caracterizadas por DRX (Difratometria de Raios X), RTP (Redução a Temperatura Programada), determinação de área superficial BET e espectroscopia Mössbauer. Os dados obtidos indicaram a formação da fase perovskita e a incorporação de todos os metais na estrutura. As reações catalíticas foram realizadas em um sistema de Reação a Temperatura Programada com tolueno (1000 ppm) e ar sintético em fase gasosa. Foi observado que a oxidação do tolueno inicia-se a 280 o C e que Mn é o principal responsável pela atividade catalítica. No entanto, a presença de pequenas quantidades de Fe (LaFe 0,27 Mn 0,73 O 3 ) resulta em um importante aumento nessa atividade. Estudos de tempo de vida mostraram que os catalisadores são estáveis mesmo após 100 h de reação a 400 o C e nenhuma alteração estrutural significativa foi observada por DRX e Mössbauer.New mixed perovskites LaFe x Mn y Mo z O 3 were prepared, characterized and investigated as catalysts for the total oxidation of the model aromatic VOC (Volatile Organic Compound), toluene. The perovskites were characterized by XRD (X-Ray Diffractometry), Mössbauer spectroscopy, TPR (Temperature Programmed Reduction) and BET surface area determination. The results suggested the formation of the perovskite phase with incorporation of all metals in the structure. The catalytic studies were carried out in a Temperature Programmed Reaction system with toluene (1000 ppm) and synthetic air in the gas phase. It was observed that the oxidation of toluene starts at temperature as low as 280 °C and that Mn is responsible for most of the catalytic activity. However, the presence of small amounts of Fe (LaFe 0.27 Mn 0.73 O 3 ) leads to an increase in this activity. Stability studies showed that these perovskite catalysts are stable even after 100 h reaction at 400 o C with no significant structural change, as observed by XRD and Mössbauer analyses.Keywords: lanthanum iron perovskite, toluene oxidation, catalytic oxidation, manganese, molybdenum IntroductionPerovskite type oxides, ABO 3 , have been extensively investigated as catalysts for several processes including fuel cells, 1 water dissociation, 2 hydrogenation and hydrogenolysis, 3 ammonia oxidation 4 and NO x reduction. 5 Several reviews covering these fields can be found in the literature. 6,7 Perovskites, especially LaMnO 3 , have also been used in environmental applications, e.g. the oxidation of hydrocarbons, 8-10 chlorinated organics 11 and H 2 O 2 reactions. 6,12 LaMnO 3 shows good stability and flexible oxygen stoichiometry ( ) with different Mn oxidation states, i.e. Mn 2+ , Mn 3+ , Mn 4+ , which strongly affects the catalytic behavior. Also, the isomorphic substitution of metals in the perovskite structure allows a control of the catalytic properties of the material. Several LaMnO 3 1525 Tristão et a...

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Lanthanum ferrite LaFeO3+d nanopowders obtained by the polymerizable complex method

Cited by 160 publications

References 22 publications

Synthesis and Characterization of Lamn1-XFexO3 (X=0, 0.1, 0.2) by Coprecipitation Route

Synthesis and Characterization of Lamn1-XFexO3 (X=0, 0.1, 0.2) by Coprecipitation Route

LaMn1-xFe xO3 and LaMn0.1-xFe0.90Mo x O3 perovskites: synthesis, characterization and catalytic activity in H2O2 reactions

LaFe xMn yMo zO 3 catalysts for the oxidation of volatile aromatic organic contaminants

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