LaCoO3 perovskite on ceramic monoliths – Pre and post reaction analyzes of the partial oxidation of methane

Brackmann, Rodrigo; Perez, Carlos A.; Schmal, Martín

doi:10.1016/j.ijhydene.2014.07.027

Cited by 36 publications

(22 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The quality of Rietveld fit for the monoclinic cell to our high resolution powder data at 300 K are also tabulated in Table 1 and we see a small decrease in fit quality using the monoclinic structure despite the increase in number of fitting parameters. The monoclinic unit cell values at 300 K are a=5.38089(9), b=5.44590(9), c=7.65237(11) β=90.972(1) V=224.212 (1). We note that the errors in the unit cell parameters are higher than those for the rhombohedral structure (Table 1) and are determined to a much higher precision than previously reported for the proposed monoclinic structure [13].…”

Section: Resultsmentioning

confidence: 50%

“…There continues to be significant research activity in the RECoO 3 perovskites (where RE rare earth cation). This is motivated in part as a result of their interesting electronic properties, but also for the potential for application in catalysis [1,2]. One of the most studied materials is LaCoO 3 in which the majority of the studies have focused on the electronic transitions of the cobalt cation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-temperature structural behaviour of LaCoO3 – A high-resolution neutron study

Bull

Knight

2016

Solid State Sciences

View full text Add to dashboard Cite

We present the temperature evolution of the crystallographic structure of LaCoO 3 in the range 4-300 K. We observe no anomalies in the rhombohedral unit cell parameters at temperatures where electronic transitions are expected to occur. We also find no evidence of the monoclinic distortion of the unit cell proposed others. We parameterise the octahedral tilt and distortion as a function of temperature which show a linear evolution towards a more symmetric form.

show abstract

Section: Resultsmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Low-temperature structural behaviour of LaCoO3 – A high-resolution neutron study

Bull

Knight

2016

Solid State Sciences

View full text Add to dashboard Cite

show abstract

“…El análisis de la Figura 3, realizada a partir de los datos de la gráfica de la Figura 2, arroja una energía de band gap de 3,3 eV , lo que define al cerámico como un óxido semiconductor [15]. El análisis térmico gravimétrico y el térmico diferencial de la Figura 4, muestran que existe una pérdida inicial de masa entre los 50 y 150 • C, asociada con la eliminación de humedad y agua intermolecular [25]. A partir de los 170 • C, se inicia una marcada pérdida de masa que alcanza cerca de un 33 %, relacionada con el inicio de procesos de autocombustión y de transformación de los compuestos de coordinación metal-citrato a aconitato, finalizando hacia los 330 • C. Los productos formados al final de esta etapa, principalmente carbonatos y oxo-carbonatos, permanecen estables hasta valores de temperatura de 700 • C, al final de la cual la evidencia de estas especies desaparece y permite la consolidación de las fases cristalinas.…”

Section: Resultados Y Discusiónunclassified

Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

2017

View full text Add to dashboard Cite

ResumenSe sintetizó el cerámico LaFe 0,2 Co 0,8 O 3 , usando el método de polimerización con ácido cítrico. Las caracterizaciones de los precursores con espectroscopia infrarroja (FT-IR), ultravioleta visible (UV-vis), y análisis térmicos (TGA-DTA), revelaron la presencia de especies tipo citrato y la consolidación de una estructura estable a partir de los 700 • C. Análisis de difracción de rayos X (XRD), energía dispersiva de rayos X (EDX), microscopia electrónica de barrido (SEM) y espectroscopia Raman, confirmaron la consolidación de un sistema cristalino tipo LaCoO 3 de fase simple romboédrica, una superficie homogénea y porosa, y tamaño de partícula nanométrico. La evaluación mediante espectroscopia de impedancias (IS), desde temperatura ambiente hasta 900 • C, mostró un material con alta conductividad eléctrica y comportamiento semiconductor.Palabras clave: Estructura tipo perovskita, Polimerización con ácido citrico, Óxido semiconductor. AbstractThe LaFe 0.2 Co 0.8 O 3 ceramic was synthesized using polymerization with citric acid method. Characterizations of the precursors with Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and thermal analysis (TGA-DTA), revealed the presence of species citrate type, and formation of a stable structure from up to 700 • C. Analysis by means of X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and Raman spectroscopy, confirmed the consolidation of a crystal system LaCoO 3 type, of rhombohedral single phase, with homogeneous and porous surface and nanometer particle size. The evaluation by impedance spectroscopy (IS) from room temperature to 900 • C, showed a material with good electrical conductivity and semiconductor type behavior.

show abstract

“…of the active phase over the support and avoids the agglomeration of metal precursor and favors a high dispersion of active component (Liu et al, 2017). Therefore, inhibiting the loss of active phase may favor the catalyst activity and stability (Brackmann at al., 2014). This explanation can be illustrated in Fig.9.…”

Section: Catalytic Activitymentioning

confidence: 99%

CATALYTIC OXIDATION OF ISOPROPYL ALCOHOL OVER PLATINUM BASED CATALYST: A STUDY OF THE EFFECT OF METHYL CELLULOSE ON Pt PARTICLES DISPERSION OVER MULLITE

Abbas-Ghaleb

Chlala

2019

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

Isopropyl alcohol (IPA) catalytic oxidation remains one of the most popular techniques to remove volatile organic compounds from indoor places. In our study, catalytic oxidation of IPA was investigated on catalysts based on platinum deposited on mullite (Al 6 Si 2 O 13 ), known for its excellent thermal stability. Pt/ Al 6 Si 2 O 13 catalysts were prepared by impregnation with and without methyl cellulose (MC) and were tested in order to study the influence of MC on the platinum particle dispersion over the support. The catalytic reactivity was compared with Pt/α-alumina and Pt/SiO 2 . Moreover, the resulting materials were characterized by BET, XRD, TEM and H 2 -chemisorption. This study showed that platinum exhibits better dispersion on alumina sites than silica sites. This can be due to a strong interaction between platinum and alumina, leading to a higher dispersion of platinum species. Furthermore, the addition of MC enhanced the Pt dispersion over the mullite, leading to an improvement in the catalytic performance.

show abstract

LaCoO3 perovskite on ceramic monoliths – Pre and post reaction analyzes of the partial oxidation of methane

Cited by 36 publications

References 39 publications

Low-temperature structural behaviour of LaCoO3 – A high-resolution neutron study

Low-temperature structural behaviour of LaCoO3 – A high-resolution neutron study

Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

CATALYTIC OXIDATION OF ISOPROPYL ALCOHOL OVER PLATINUM BASED CATALYST: A STUDY OF THE EFFECT OF METHYL CELLULOSE ON Pt PARTICLES DISPERSION OVER MULLITE

Contact Info

Product

Resources

About