Hydrogenation and Hydrogenolysis of Hydrocarbons on Perovskite Oxides

Ichimura, Kenji; Inoue, Y.; Yasumori, Iwao

doi:10.1080/01614949208016314

Cited by 29 publications

(19 citation statements)

References 26 publications

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“…The perovskites were prepared by the reaction of 0.5 mol of citric acid (CA) dissolved in 2 mol of water at 60 °C, followed by the addition of 1 mmol of La(NO 3 ) 3 3 . The mixture was stirred for about 2 hours, until a clear orange solution of the stable metal-CA complexes was obtained.…”

Section: Methodsmentioning

confidence: 99%

“…A second sextet at δ 0.37 mm/s, e 0.05 mm/s and H hf 49.2 T is also observed with a relative area of 53%. This is identified as the poorly crystallized LaFeO 3 17,18 probably due to small particle size or to the presence of Mn.…”

Section: Characterization Of the Perovskitesmentioning

confidence: 99%

“…Perovskites type oxides, ABO 3 , have been extensively investigated as catalysts for several processes including fuel cells 1 , water dissociation 2 , hydrogenation, hydrogenolysis 3 , ammonia oxidation 4 and NO x reduction 5 . Several reviews covering these fields can be found in the literature 6,7 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Characterization Of the Perovskitesmentioning

confidence: 99%

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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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“…Perovskite 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.…”

Section: Introductionmentioning

confidence: 99%

“…have already been investigated. 13,14 In this work we studied for the first time the isomorphic substitution of Mn in the LaMnO 3 structure by different amounts of Fe and Mo to produce the series of perovskites LaFe x Mn y Mo z O 3 . The Fe and Mo can also vary their oxidation states and this property can improve the catalytic activity in oxidation processes.…”

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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Heterogeneous Catalytic Hydrogenation

Bartók¹,

Molnár²

2009

Patai's Chemistry of Functional Groups

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Introduction General Characteristics Hydrogenation of C  C Bonds Hydrogenation of C  O Bonds Hydrogenation of C  N Bonds Asymmetric Hydrogenations

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Hydrogenation and Hydrogenolysis of Hydrocarbons on Perovskite Oxides

Cited by 29 publications

References 26 publications

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

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

Heterogeneous Catalytic Hydrogenation

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