High temperature stable magnesium oxide catalyst for catalytic combustion of methane: A comparison with manganesesubstituted barium hexaaluminate

Berg, Mats; Jäås, S.G.

doi:10.1016/0920-5861(95)00143-x

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…Meanwhile, methane is stable, so it is easy to be transported and stored. This makes methane to be a good candidate of fuel in most of the research on catalytic combustion [2].…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of methane over iron- and manganese-substituted lanthanum hexaaluminates

Zheng

Ren

Song

et al. 2009

React Kinet Catal Lett

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A series of hexaaluminates, LaMnFe x Al 11-x O 19-d samples (x = 1, 2, 4, 6, 8) as new catalysts were prepared by carbonate precipitation and calcined at high temperature. Fe and Mn ions were used as active components to replace part of aluminum ions in the hexaaluminate lattices. The structures and properties of these samples were characterized by XRD, BET, and XPS. The series of hexaaluminates exhibited significant catalytic activity and stability at high temperature. The LaMnFe 2 Al 9 O 19-d retains a larger surface area and shows a good activity in methane combustion.

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“…Meanwhile, methane is stable, so it is easy to be transported and stored. This makes methane to be a good candidate of fuel in most of the research on catalytic combustion [2].…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of methane over iron- and manganese-substituted lanthanum hexaaluminates

Zheng

Ren

Song

et al. 2009

React Kinet Catal Lett

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“…El comportamiento para el caso de materiales usados en reacción es bastante análogo. En todos los casos el área superficial hallada en este trabajo es menor que las reportadas por Berg y Järas (1995), quienes obtuvieron 43.4 m 2 g -1 con calcinación 900 o C y 24.2 m 2 g -1 a 1100 o C; no obstante, el porcentaje de reducción del área (44%) es bastante mayor que el presentado en este trabajo (26.2% para óxido grado reactivo y 27.9% para óxido grado industrial).…”

Section: Estabilidad Térmicaunclassified

Combustión sin Llama de Mezclas Pobres Metano-Aire sobre Óxido de Magnesio Adicionado con Óxido de Calcio

Gómez¹,

Sánchez

Jaramillo

2008

Inf. tecnol.

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Se preparó material activo partiendo de óxido de magnesio (MgO) grado industrial y grado reactivo adicionado con óxido de calcio (CaO). En un lecho fijo empacado con partículas de material activo, se investigó el efecto que tienen la cantidad de CaO adicionado, la temperatura de calcinación, la velocidad espacial, el exceso de oxígeno y la composición de mezcla reactiva sobre la actividad, medida como conversión porcentual de metano. Se obtuvo combustión completa de metano para composiciones menores al límite inferior de inflamabilidad lo que permite evitar la emisión de NO x producidos por mecanismo térmico. Las muestras preparadas con MgO grado industrial tuvieron actividad similar a las obtenidas con MgO grado reactivo adicionado con CaO. Los materiales, de fácil preparación y bajo costo, mostraron alta estabilidad térmica antes y después de someterlos a reacción. Las propiedades de los sólidos preparados los hacen promisorios para aplicaciones en sistemas de combustión de gas natural y depuración de emisiones gaseosas.

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“…The acidic and basic nature of the sites in the MgO(001) surface affect directly the catalytic activity of adsorbed molecules and maintain a large surface area at high calcination temperatures. For this reason, MgO is an important mineral often used in industrial catalytic processes, exhibiting particularly smaller activity loss in the combustion of methane . The oxidation of magnesium leading to the MgO crystal growth represents a major drawback in gas–oxide interfaces …”

Section: Introductionmentioning

confidence: 99%

“…For this reason, MgO is an important mineral often used in industrial catalytic processes, exhibiting particularly smaller activity loss in the combustion of methane. 2 The oxidation of magnesium leading to the MgO crystal growth represents a major drawback in gas−oxide interfaces. 3 The perfect-terrace sites are important on the regular and nondefective MgO(001) surface employed in heterogeneous catalysis.…”

Section: Introductionmentioning

confidence: 99%

Proton Migration on Perfect, Vacant, and Doped MgO(001) Surfaces: Role of Dissociation Residual Groups

2018

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Although migration processes on low-coordination surface sites of a magnesium oxide (MgO) surface are important in technological applications including catalysis in gas interfaces, they are not well understood. In particular, hydrated MgO(001) surfaces present charge transfer and ionic transport phenomena that sometimes do not work properly in technological devices. On the other hand, low-coordination surface sites are chemically attractive. Given that defects and adsorbed species can be characterized by the kinetics of surface processes, in this work, we investigated proton mobility pathways produced from the dissociative adsorption of water molecules on different MgO(001) surfaces: a perfect-terrace, with an anionic vacancy, and with an Al-doped + cationic vacancy. For that purpose, we employed density-functional theory with periodic boundary conditions combined with the climbing imaged nudged elastic band method to compute energy barriers. The dissociative adsorption of water molecules on the perfect-terrace surface depends on their state of aggregation; the anionic vacancy was filled with hydroxyl groups, giving rise to co-adsorbed protons, and the cationic vacancy favored the formation of hydroxylated centers, in good agreement with experiment. The doping and vacancies increase the surface dissociation in the absence of co-adsorbed water molecules by decreasing the barriers of proton and hydroxyl formation. For the different surfaces, considering perfect-terrace surface or surface with defects, the water, hydroxyl, and proton species, are the main sources for changing the proton migration barriers. More free surface sites of basic residual groups follow favorable kinetic mobility of protons on MgO and increase the stability of the migration products, as seen in the surface with an anionic vacancy. Therefore, we showed that defects on MgO(001) surfaces may be important in surface proton transport due to the existence of favorable dissociative adsorption mechanisms of water molecules producing specific residual groups needed to lead to most stable migration pathways.

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High temperature stable magnesium oxide catalyst for catalytic combustion of methane: A comparison with manganesesubstituted barium hexaaluminate

Cited by 18 publications

References 12 publications

Catalytic combustion of methane over iron- and manganese-substituted lanthanum hexaaluminates

Catalytic combustion of methane over iron- and manganese-substituted lanthanum hexaaluminates

Combustión sin Llama de Mezclas Pobres Metano-Aire sobre Óxido de Magnesio Adicionado con Óxido de Calcio

Proton Migration on Perfect, Vacant, and Doped MgO(001) Surfaces: Role of Dissociation Residual Groups

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