Characterization and hydrogenation activity of Ni/Si(Al)- MCM-41 catalysts prepared by deposition-precipitation / Rubén Nares in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1154–1162 Titre : Characterization and hydrogenation activity of Ni/Si(Al)- MCM-41 catalysts prepared by deposition-precipitation Type de document : texte imprimé Auteurs : Rubén Nares, Auteur ; Jorge Ramírez, Auteur ; Aída Gutiérrez-Alejandre, Auteur ; Rogelio Cuevas, Auteur Année de publication : 2009 Article en page(s) : p. 1154–1162 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nickel phyllosilicate Catalysts spectroscopy Résumé : The deposition−precipitation (DP) method was used for the preparation of Ni/SiMCM-41 and Ni/AlMCM-41 catalysts with different DP times (1−4 h), and the catalysts were characterized by BET, XRD, TPR, FTIR spectroscopy, and TEM. On both types of catalysts, the Ni(II) phases formed are a mixture of 1:1 nickel phyllosilicate and Ni(OH)2. The quantity of each phase at the end of the deposition process determines the final Ni particle size; i.e., greater amounts of Ni(OH)2 lead to larger Ni particles. In addition, it was found that the presence of aluminum in the framework of MCM-41 delays the formation of the nickel hydrosilicate phase. As a result of the consumption of the siliceous pore walls during DP, the long-range order of the MCM-41 hexagonal pore structure is gradually lost. Catalytic activity in the hydrogenation of naphthalene was higher for Ni/SiMCM-41 catalysts and was a linear function of the exposed area of Ni particles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800569j [article] Characterization and hydrogenation activity of Ni/Si(Al)- MCM-41 catalysts prepared by deposition-precipitation [texte imprimé] / Rubén Nares, Auteur ; Jorge Ramírez, Auteur ; Aída Gutiérrez-Alejandre, Auteur ; Rogelio Cuevas, Auteur . - 2009 . - p. 1154–1162. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1154–1162 Mots-clés : Nickel phyllosilicate Catalysts spectroscopy Résumé : The deposition−precipitation (DP) method was used for the preparation of Ni/SiMCM-41 and Ni/AlMCM-41 catalysts with different DP times (1−4 h), and the catalysts were characterized by BET, XRD, TPR, FTIR spectroscopy, and TEM. On both types of catalysts, the Ni(II) phases formed are a mixture of 1:1 nickel phyllosilicate and Ni(OH)2. The quantity of each phase at the end of the deposition process determines the final Ni particle size; i.e., greater amounts of Ni(OH)2 lead to larger Ni particles. In addition, it was found that the presence of aluminum in the framework of MCM-41 delays the formation of the nickel hydrosilicate phase. As a result of the consumption of the siliceous pore walls during DP, the long-range order of the MCM-41 hexagonal pore structure is gradually lost. Catalytic activity in the hydrogenation of naphthalene was higher for Ni/SiMCM-41 catalysts and was a linear function of the exposed area of Ni particles. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800569j

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