Study of the formation of LaMO3 (M=Co, Mn) perovskites by propionates precursors: application to the catalytic destruction of chlorinated VOCs

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

doi:10.1016/s0920-5861(01)00417-5

Cited by 89 publications

(40 citation statements)

References 30 publications

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“…Figure 2 showed results obtained. We observed characteristic peaks for perovskite structure such as 593.3 562.7, 417.8 cm −1 [14]. In case of sample substituted by Ag and Sr, a shoulder peak was recognized at 642cm −1 .…”

Section: Resultsmentioning

confidence: 70%

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

Bình

Tam

Quynh

2011

e-J. Surf. Sci. Nanotechnol.

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A series of nanosized perovskite oxides, LaCoO3 and La1−xBxCoO3 (x = 0.1; B: Sr, Ag), was synthesized by citrate method. The samples were characterized by XRD, IR and SEM. The XRD results show that all samples have principal phase with rhombohedra perovskite structure and particles size of 30-50 nm. The catalytic performance of these nanoperovskites has been evaluated by the total combustion of 1000 ppm of toluene in air. The result obtained shows the highest activity for the sample La0.9Ag0.1CoO3. The last one seems to be related with the highest quantity of oxygen released as showed by oxygen temperature program desorption results (O2-TPD).

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Section: Resultsmentioning

confidence: 70%

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

Bình

Tam

Quynh

2011

e-J. Surf. Sci. Nanotechnol.

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“…These non-stoichiometries are commonly observed in perovskite structures. 10,20,21 The shift seems more pronounced for LaMnO 3 ( Figure 6(a)) compared to LaFe 0.27 Mn 0.73 O 3 ( Figure 6(b)), which could be related to the higher stability produced in the perovskite by the presence of Fe. Broad and low intensity peaks between 20-30 o can also be observed in Figure 6.…”

Section: Catalytic Oxidation Of Toluenementioning

confidence: 95%

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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“…For all the LC samples, the peak 594 cm À1 corresponds to the asymmetric stretching vibration of Co-O in octahedral CoO 6 . 12) Another absorption peak at 420 cm À1 marks the formation of O-Co-O and La-O-Co.…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

Dye Degradation Activity and Stability of Perovskite-Type LaCoO3−x (x=0&sim;0.075)

Sun

Jiang

et al. 2010

Mater. Trans.

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Perovskite-type LaCoO 3Àx (x ¼ 0$0:075) porous powder was synthesized via citrate sol-gel method. With calcination temperature increasing, its crystal structure changed from LaCoO 3 to LaCoO 2:925 with the increase in oxygen vacancy. The synthesized LaCoO 3Àx contains a large amount of adsorbed oxygen on its surface due to the existence of oxygen vacancy to some extent. Dye degradation activity of LaCoO 3Àx in methyl orange solution was investigated both under the visible light irradiation (>400 nm) and in the dark. LaCoO 3Àx exhibited dye degradation activity in the dark when being preserved in methyl orange solution for a long time caused by the reducibility of Co 3þ in LaCoO 3Àx , and then dye molecule was oxidized gradually and slowly. The degradation rate was improved under the visible light due to the optical property of LaCoO 3Àx in visible light region. After degradation, methyl orange molecule may be decomposed to acetate group in a small amount. After use for a long time, some Co 3þ was reduced to Co 2þ accompanied by the formation of oxygen vacancy, and then LaCoO 3 transformed to LaCoO 2:925 gradually. For LaCoO 3Àx calcined at 800 C, LaCoO 3Àx perovskite skeleton structure was stable, and can be reused in recycle dye degradation.

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Study of the formation of LaMO3 (M=Co, Mn) perovskites by propionates precursors: application to the catalytic destruction of chlorinated VOCs

Cited by 89 publications

References 30 publications

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

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

Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3−<I>x</I></SUB> (<I>x</I>=0&sim;0.075)

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Study of the formation of LaMO3 (M=Co, Mn) perovskites by propionates precursors: application to the catalytic destruction of chlorinated VOCs

Cited by 89 publications

References 30 publications

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

Total Oxidation of Toluene on Nano-Perovskites La1-xBxCoO3 (B: Ag, Sr)

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

Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3&minus;<I>x</I></SUB> (<I>x</I>=0&sim;0.075)

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Dye Degradation Activity and Stability of Perovskite-Type LaCoO<SUB>3−<I>x</I></SUB> (<I>x</I>=0&sim;0.075)