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Dehydrogenation of isopropanol on copper - containing mesoporous catalysts / Nancy F. Balsamo in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp.12365–12370 Titre : Dehydrogenation of isopropanol on copper - containing mesoporous catalysts Type de document : texte imprimé Auteurs : Nancy F. Balsamo, Auteur ; Corina M. Chanquia, Auteur ; Eduardo R. Herrero, Auteur Année de publication : 2011 Article en page(s) : pp.12365–12370 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mesoporous  catalysts Résumé : Copper-containing mesoporous catalysts with an MCM-41 type structure have been prepared using direct hydrothermal synthesis and characterized using XRD, AAS, N2 adsorption−desorption, DRUV−vis, and TEM. All of the samples showed high structural regularity and surface area. Three copper species are presented in these materials: isolated mononuclear Cuδ+ species, oligonuclear [Cuδ+···Oδ−···Cuδ+]n clusters, and bulky CuO oxides. These materials were catalytically tested in isopropanol dehydrogenation, showing good activity and very high selectivity to propanone at 300 °C. A further reduction treatment of the samples allowed us to suggest possible active species. Both the [Cuδ+···Oδ−···Cuδ+]n clusters and the isolated Cuδ+ cations seem to be the species responsible for isopropanol dehydrogenation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100972h [article] Dehydrogenation of isopropanol on copper - containing mesoporous catalysts [texte imprimé] / Nancy F. Balsamo, Auteur ; Corina M. Chanquia, Auteur ; Eduardo R. Herrero, Auteur . - 2011 . - pp.12365–12370. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp.12365–12370 Mots-clés : Mesoporous  catalysts Résumé : Copper-containing mesoporous catalysts with an MCM-41 type structure have been prepared using direct hydrothermal synthesis and characterized using XRD, AAS, N2 adsorption−desorption, DRUV−vis, and TEM. All of the samples showed high structural regularity and surface area. Three copper species are presented in these materials: isolated mononuclear Cuδ+ species, oligonuclear [Cuδ+···Oδ−···Cuδ+]n clusters, and bulky CuO oxides. These materials were catalytically tested in isopropanol dehydrogenation, showing good activity and very high selectivity to propanone at 300 °C. A further reduction treatment of the samples allowed us to suggest possible active species. Both the [Cuδ+···Oδ−···Cuδ+]n clusters and the isolated Cuδ+ cations seem to be the species responsible for isopropanol dehydrogenation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100972h

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