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Synthesis of titanium-containing mesoporous silicas as catalysts for cyclohexene epoxidation / Verónica R. Elías in Industrial & engineering chemistry research, Vol. 48 N° 20 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9076–9082 Titre : Synthesis of titanium-containing mesoporous silicas as catalysts for cyclohexene epoxidation Type de document : texte imprimé Auteurs : Verónica R. Elías, Auteur ; Mónica E. Crivello, Auteur ; Eduardo R. Herrero, Auteur Année de publication : 2010 Article en page(s) : pp. 9076–9082 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ti-containing  mesoporous  materials  Hydrothermal  synthesis Résumé : Ti-containing mesoporous materials have been prepared by hydrothermal synthesis at 100 °C with two different Si/Ti ratios (20 and 60) in the synthesis mixture. A detailed study about the effect of synthesis time on the physicochemical properties of the materials has been carried out. The samples were characterized by XRD, DRUVvis, N2 adsorption, and pyridine adsorption analyzed by FT-IR. The samples synthesized using the lower Si/Ti ratio presented the higher titanium incorporation and the higher acid character. The synthesis time appears as an important parameter that affects the textural, structural, chemical, and acid properties of the final solids. For the lower Si/Ti ratio, a longer synthesis time is needed to obtain a more ordered structure. However, in both cases, short synthesis times do not allow a proper incorporation of titanium into the silica framework, which is reached with synthesis times of about 3 days. The results of catalytic activity indicate that the solids studied here present an interesting potential as catalysts in the selective oxidation of cyclohexene using H2O2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018017 [article] Synthesis of titanium-containing mesoporous silicas as catalysts for cyclohexene epoxidation [texte imprimé] / Verónica R. Elías, Auteur ; Mónica E. Crivello, Auteur ; Eduardo R. Herrero, Auteur . - 2010 . - pp. 9076–9082. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 20 (Octobre 2009) . - pp. 9076–9082 Mots-clés : Ti-containing  mesoporous  materials  Hydrothermal  synthesis Résumé : Ti-containing mesoporous materials have been prepared by hydrothermal synthesis at 100 °C with two different Si/Ti ratios (20 and 60) in the synthesis mixture. A detailed study about the effect of synthesis time on the physicochemical properties of the materials has been carried out. The samples were characterized by XRD, DRUVvis, N2 adsorption, and pyridine adsorption analyzed by FT-IR. The samples synthesized using the lower Si/Ti ratio presented the higher titanium incorporation and the higher acid character. The synthesis time appears as an important parameter that affects the textural, structural, chemical, and acid properties of the final solids. For the lower Si/Ti ratio, a longer synthesis time is needed to obtain a more ordered structure. However, in both cases, short synthesis times do not allow a proper incorporation of titanium into the silica framework, which is reached with synthesis times of about 3 days. The results of catalytic activity indicate that the solids studied here present an interesting potential as catalysts in the selective oxidation of cyclohexene using H2O2. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018017