Catalytic soot oxidation activity of Cr-doped ceria (Ce Cr O2-δ) synthesized by sol-gel method with organic additives

Neelapala, Satya Deepika; Dasari, Harshini

doi:10.1016/j.mset.2018.06.009

Cited by 8 publications

(6 citation statements)

References 29 publications

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“…In sol-gel synthetic methods, a starting material is converted into a colloidal solution (the 'sol'), which further forms 'gel'. This method requires either esters or salts soluble in weakly acidic organic solutions as new raw materials 29 . A typical sol-gel process involves; hydrolysis, condensation, gelation, ageing and drying.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

N.A¹,

Haruna²,

Salisu³

2022

juc

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Design of viable catalysts that exhibits high catalytic activity and stability, as well as resistance against deactivation could be achieved by selecting the right active metal and support, understanding their structure, synergy or the metal support interaction and by employing the right preparation technique. Numerous studies and reviews have dealt with various aspects of CeO2 based catalysts, with the sole target of understanding its activity in various reactions such as dry and steam reforming of methane. Good metal dispersion on CeO2 surface is explained to be the reason for the promising activity of this systems. This review focuses on the synthesis, characterization and application of some CeO2 doped/supported catalysts in hydrogen production by dry and steam reforming of methane, and other reactions. Various synthetic methods for the preparation of the metal doped/supported CeO2 catalysts were introduced with a focus on how to effectively produce stable and efficient catalysts. Subsequently, some advanced characterization techniques were presented to precisely probe the metal and CeO2 at the atomic level, which is critical in investigating the structure of the catalysts.

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Section: Sol-gel Methodsmentioning

confidence: 99%

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

N.A¹,

Haruna²,

Salisu³

2022

juc

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“…Generalmente, el rango de temperatura del sistema de escape es de alrededor de 600-800 °C para gasolina y 150-500 °C para diésel. Esta estrategia conduce a un fenómeno exotérmico incontrolable, lo cual puede dañar el filtro, siendo esto una desventaja 5 . Recientemente, se han hecho mejoramientos significativos equipando los sistemas de escape con un convertidor catalítico.…”

Section: Introductionunclassified

Combustión De Hollín Usando Catalizadores Basados en Óxidos De Níquel(ii) Y Cerio(iv): Preparación, Caracterización Y Estudio Cinético

López,

Arcos,

Hurtado Cotillo

et al. 2023

rsqp

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El hollín generado en las arenas de fundición es un impedimento para la reutilización de las arenas debido a su contaminación, por ello la oxidación catalítica es necesaria para incrementar la velocidad de oxidación del hollín a menores temperaturas, mejorando la eficiencia energética y ambiental del proceso de recuperación. Los catalizadores mixtos de NiCe fueron preparados mediante el método de evaporación de solvente en proporciones molares Ni:Ce de 0.5:9.5, 1:9, 5:5, y 9:1 representados como Ni0.5Ce9.5, Ni1Ce9, Ni5Ce5 y Ni9Ce1, respectivamente y los catalizadores másicos CeO2 y NiO también fueron preparados por el mismo método. Todas las muestras se caracterizaron mediante diferentes técnicas basadas en su composición química, estructural, morfológica, textural y propiedades redox. Las técnicas de caracterización fueron: sorción de N2 (método BET), difracción de rayos X (XRD), termogravimetría (TGA), reducción a temperatura programada con H2 (TPR-H2), espectroscopía láser Raman (LRS), y espectroscopía infrarroja por transformada de Fourier (FTIR). La actividad catalítica se evaluó por TGA bajo aire sintético en contacto directo para la combustión del hollín. La calcinación a 800 °C y 600 °C de los catalizadores mixtos mostraron una baja superficie específica (3–74 m2 g-1) con tamaño promedio de cristalita que variaron con los distintos valores NiCe (9–22 nm). Sin embargo, se observó un incremento en el volumen del poro mesoporoso, un importante parámetro para la oxidación del hollín con aire. Asimismo, los difractogramas de rayos X del catalizador NiCe mostraron una introducción parcial de los iones Ni2+ a la red de la fluorita del CeO2 mediante un desplazamiento con respecto a la posición inicial del difractograma del CeO2. El catalizador Ni0.5Ce9.5 calcinado a 600 °C obtuvo la mejor actividad catalítica (T50 = 519.43 °C) comparado con los catalizadores Ni1Ce9, Ni5Ce5 y Ni9Ce1 and CeO2 calcinados a 800 °C y 600 °C. Se evaluó la cinética de oxidación del hollín, donde se determinó la energía de activación (Ea) tanto para el hollín catalizado como para el no catalizado bajo TGA con flujo de aire y se concluyó que el catalizador Ni0.5Ce9.5 (600) mejoró efectivamente la actividad catalítica (Ea = 73 kJ mol-1) generando la eliminación del hollín a una temperatura más baja.

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“…Most of the metals doped with CeO 2 reported in various works enhanced the catalytic activity significantly [9,18,[21][22][23][24][25][26]28]. On the other hand, few metal oxides doped with CeO 2 did not considerably reduce the temperature required for soot combustion compared to the pure CeO 2 catalyst [21,27].…”

Section: Introductionmentioning

confidence: 99%

A Negative Effect of Niobium‐Doped Ceria on Soot Oxidation Activity^‡

et al. 2022

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Niobium-doped ceria catalysts were synthesized to study soot oxidation activity. X-Ray diffraction (XRD) and Raman analysis of the samples revealed the presence of a fluorite structure of CeO 2 for all the doped samples. The T 50 temperature of the pure CeO 2 sample was more significant than that of bare soot. The high catalytic activity of the CeO 2 catalyst can be attributed to the low crystallite size, high facet ratio, and the large Brunauer-Emmett-Teller (BET) surface area as compared to Nb-doped samples. The activation energy calculated by both Ozawa and KAS methods were found to be low for CeO 2 when compared to Nb-doped samples. CeO 2 resulted in better soot oxidation activity with low activation energy.

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Catalytic soot oxidation activity of Cr-doped ceria (Ce Cr O2-δ) synthesized by sol-gel method with organic additives

Cited by 8 publications

References 29 publications

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

Combustión De Hollín Usando Catalizadores Basados en Óxidos De Níquel(ii) Y Cerio(iv): Preparación, Caracterización Y Estudio Cinético

A Negative Effect of Niobium‐Doped Ceria on Soot Oxidation Activity^‡

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Catalytic soot oxidation activity of Cr-doped ceria (Ce Cr O2-δ) synthesized by sol-gel method with organic additives

Cited by 8 publications

References 29 publications

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

An overview on Metal doped / Supported Ceria Catalysts: Synthesis, Characterization and Applications

Combustión De Hollín Usando Catalizadores Basados en Óxidos De Níquel(ii) Y Cerio(iv): Preparación, Caracterización Y Estudio Cinético

A Negative Effect of Niobium‐Doped Ceria on Soot Oxidation Activity‡

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A Negative Effect of Niobium‐Doped Ceria on Soot Oxidation Activity^‡