Disclosing the synergistic mechanism in the catalytic activity of different-sized Ru nanoparticles for ammonia synthesis at mild reaction conditions

According to our previous results, a broad size distribution of Ru-supported nanoparticles is required for a high activity in ammonia synthesis under mild reaction conditions, since a synergy in the catalytic activity was observed between particles of different sizes. In this work we reach a more co...

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Vydané v:Catalysis today Ročník 251; s. 88 - 95
Hlavní autori: Fernández, Camila, Pezzotta, Chiara, Gaigneaux, Eric M., Bion, Nicolas, Duprez, Daniel, Ruiz, Patricio
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier 01.08.2015
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Abstract According to our previous results, a broad size distribution of Ru-supported nanoparticles is required for a high activity in ammonia synthesis under mild reaction conditions, since a synergy in the catalytic activity was observed between particles of different sizes. In this work we reach a more controlled heterogeneity of sizes by mixing different ruthenia colloidal suspensions, before impregnation on alumina, which improves the catalytic activity. Kinetic studies, 'in situ' characterizations and H/D isotopic exchange experiments were separately performed on catalysts containing small Ru nanoparticles and catalysts containing larger particles, in order to elucidate the mechanism of catalytic cooperation. Clear evidence is presented of a mechanism involving the migration of H atoms from large to small Ru nanoparticles, which is expected to improve the catalytic performance by promoting the hydrogenation of adsorbed NHX species and the release of active sites
AbstractList According to our previous results, a broad size distribution of Ru-supported nanoparticles is required for a high activity in ammonia synthesis under mild reaction conditions, since a synergy in the catalytic activity was observed between particles of different sizes. In this work we reach a more controlled heterogeneity of sizes by mixing different ruthenia colloidal suspensions, before impregnation on alumina, which improves the catalytic activity. Kinetic studies, 'in situ' characterizations and H/D isotopic exchange experiments were separately performed on catalysts containing small Ru nanoparticles and catalysts containing larger particles, in order to elucidate the mechanism of catalytic cooperation. Clear evidence is presented of a mechanism involving the migration of H atoms from large to small Ru nanoparticles, which is expected to improve the catalytic performance by promoting the hydrogenation of adsorbed NHX species and the release of active sites
Author Fernández, Camila
Gaigneaux, Eric M.
Bion, Nicolas
Duprez, Daniel
Pezzotta, Chiara
Ruiz, Patricio
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  fullname: Ruiz, Patricio
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Keywords Hydrogen mobility
Particle size heterogeneity
Ammonia synthesis
Catalytic cooperation mechanism
Ru-supported nanoparticles
Language English
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Title Disclosing the synergistic mechanism in the catalytic activity of different-sized Ru nanoparticles for ammonia synthesis at mild reaction conditions
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