Catalytic destruction of chlorinated C2 compounds on a LaMnO3+δ perovskite catalyst

Sinquin, G.; Petit, C.; Libs, S.; Hindermann, J. P.; Kiennemann, A.

doi:10.1016/s0926-3373(00)00293-9

Cited by 58 publications

(32 citation statements)

References 23 publications

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“…6, left). However, the amount of exchanged 16 O 2 (i.e. at the bulk level) is higher in the catalysts containing both Mo and W that in the W-free sample (Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 87%

“…In addition, a different distribution of isotopic oxygen species is observed on these samples depending on the W/(Mo+W) ratio. Thus, the amount of double exchanged 16 (Fig. 6, left).…”

Section: Catalyst Characterizationmentioning

confidence: 97%

“…MW0-L), shows a higher amount of double exchanged 16 O 18 O than of exchanged 16 O 2, suggesting that the oxygen dissociation in the catalyst surface is faster than its diffusion into the bulk, enhancing the concentration of active electrophilic species on the catalyst surface. However, W-containing samples show a higher amount of 16 O 2 , indicating that the diffusion of oxygen species into the bulk is faster than the oxygen dissociation. Thus, it can be concluded that the incorporation of tungsten in the catalyst increases the diffusion of oxygen in the bulk which, under catalytic conditions, could facilitate a fast reoxidation of the catalyst.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…Usually, two types of catalysts have been studied for the chlorinated VOCs abatement: metal oxides [8][9][10][11][12][13][14][15][16][17][18][19][20], either single (e.g. chromium oxide) or mixed (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Blanch-Raga

Soriano

Palomares

et al. 2013

Applied Catalysis B: Environmental

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“…6, left). However, the amount of exchanged 16 O 2 (i.e. at the bulk level) is higher in the catalysts containing both Mo and W that in the W-free sample (Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 87%

“…In addition, a different distribution of isotopic oxygen species is observed on these samples depending on the W/(Mo+W) ratio. Thus, the amount of double exchanged 16 (Fig. 6, left).…”

Section: Catalyst Characterizationmentioning

confidence: 97%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Blanch-Raga

Soriano

Palomares

et al. 2013

Applied Catalysis B: Environmental

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“…This result is likely related to the higher activity of LaMnO 3 compared to LaFeO 3 for total oxidation, as reported in the literature. 22,23 On the other hand, the higher activity observed for the perovskite LaFe 0.27 Mn 0.73 O 3 suggests a special effect of the combination of small amounts of Fe with Mn. However, more detailed studies are necessary to understand the effect of Fe in the catalytic reaction.…”

Section: Discussionmentioning

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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Total Oxidation of Volatile Organic Compounds

Pârvulescu

2015

Perovskites and Related Mixed Oxides

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Catalytic destruction of chlorinated C2 compounds on a LaMnO3+δ perovskite catalyst

Cited by 58 publications

References 23 publications

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

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

Total Oxidation of Volatile Organic Compounds

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