Effect of synthesis conditions on the structure and catalytic performance of V- and Ce-incorporated SBA-15-like materials in propane selective oxidation / Ozge Aktas in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6790–6802 Titre : Effect of synthesis conditions on the structure and catalytic performance of V- and Ce-incorporated SBA-15-like materials in propane selective oxidation Type de document : texte imprimé Auteurs : Ozge Aktas, Auteur ; Sena Yasyerli, Auteur ; Gulsen Dogu, Auteur Année de publication : 2010 Article en page(s) : pp 6790–6802 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst Selective Oxidation. Résumé : Vanadia- and/or ceria-incorporated SBA-15-like materials were prepared by impregnation and one-pot hydrothermal synthesis procedures at different solution pH values. The pH of the synthesis solution was found to have a very strong effect on the pore structure, chemical composition, and morphology of the synthesized materials. Materials synthesized by impregnation of V and/or Ce and by the one-pot hydrothermal route at pH 1.0 showed the characteristic ordered pore structure of SBA-15. However, the materials prepared by the one-pot synthesis route at pH 1.5 gave complex pore structures with bottleneck-shaped and/or slit-like interconnected pores. Activity tests in the selective oxidation of propane showed higher activities for the V-incorporated materials than for the materials containing Ce and V−Ce. Catalysts synthesized by impregnation gave higher propane conversions. However, the propylene selectivity values were higher with the catalysts prepared by the one-pot route. An increase in the temperature from 550 to 600 °C led to increases in both the conversion and the propylene selectivity with the V- and V−Ce-incorporated materials prepared by the one-pot procedure at pH 1.5. For the V-incorporated catalyst prepared by this route, the propane conversion and propylene selectivity were obtained as 40% and 62%, respectively, at a space time of 0.4 s·g·cm−3 and a temperature of 600 °C. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901672b [article] Effect of synthesis conditions on the structure and catalytic performance of V- and Ce-incorporated SBA-15-like materials in propane selective oxidation [texte imprimé] / Ozge Aktas, Auteur ; Sena Yasyerli, Auteur ; Gulsen Dogu, Auteur . - 2010 . - pp 6790–6802. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 6790–6802 Mots-clés : Catalyst Selective Oxidation. Résumé : Vanadia- and/or ceria-incorporated SBA-15-like materials were prepared by impregnation and one-pot hydrothermal synthesis procedures at different solution pH values. The pH of the synthesis solution was found to have a very strong effect on the pore structure, chemical composition, and morphology of the synthesized materials. Materials synthesized by impregnation of V and/or Ce and by the one-pot hydrothermal route at pH 1.0 showed the characteristic ordered pore structure of SBA-15. However, the materials prepared by the one-pot synthesis route at pH 1.5 gave complex pore structures with bottleneck-shaped and/or slit-like interconnected pores. Activity tests in the selective oxidation of propane showed higher activities for the V-incorporated materials than for the materials containing Ce and V−Ce. Catalysts synthesized by impregnation gave higher propane conversions. However, the propylene selectivity values were higher with the catalysts prepared by the one-pot route. An increase in the temperature from 550 to 600 °C led to increases in both the conversion and the propylene selectivity with the V- and V−Ce-incorporated materials prepared by the one-pot procedure at pH 1.5. For the V-incorporated catalyst prepared by this route, the propane conversion and propylene selectivity were obtained as 40% and 62%, respectively, at a space time of 0.4 s·g·cm−3 and a temperature of 600 °C. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901672b

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Selectivity and stability enhancement of iron oxide catalyst by ceria incorporation for selective oxidation of H2S to sulfur / D. D. Eslek Koyuncu in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5223–5229 Titre : Selectivity and stability enhancement of iron oxide catalyst by ceria incorporation for selective oxidation of H2S to sulfur Type de document : texte imprimé Auteurs : D. D. Eslek Koyuncu, Auteur ; Sena Yasyerli, Auteur Année de publication : 2009 Article en page(s) : pp. 5223–5229 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Iron oxide catalysts H2S Selective oxidation Ceria incorporation Résumé : Cerium incorporated iron oxide catalysts and a pure iron oxide catalytic material were prepared by the complexation technique and their catalytic performances were investigated for selective oxidation of H2S to elemental sulfur in a fixed-bed flow reactor. Ce−Fe mixed oxide catalyst having a Fe/Ce ratio of 1/1 (2Fe−2Ce) showed complete conversion and very high sulfur selectivity in the temperature range of 200−300 °C. Sulfur selectivity and stability of iron oxide catalyst was significantly enhanced by the incorporation of cerium into the catalyst structure. It was concluded that incorporation of ceria into the catalyst structure significantly improved the redox ability of the catalyst. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017059 [article] Selectivity and stability enhancement of iron oxide catalyst by ceria incorporation for selective oxidation of H2S to sulfur [texte imprimé] / D. D. Eslek Koyuncu, Auteur ; Sena Yasyerli, Auteur . - 2009 . - pp. 5223–5229. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5223–5229 Mots-clés : Iron oxide catalysts H2S Selective oxidation Ceria incorporation Résumé : Cerium incorporated iron oxide catalysts and a pure iron oxide catalytic material were prepared by the complexation technique and their catalytic performances were investigated for selective oxidation of H2S to elemental sulfur in a fixed-bed flow reactor. Ce−Fe mixed oxide catalyst having a Fe/Ce ratio of 1/1 (2Fe−2Ce) showed complete conversion and very high sulfur selectivity in the temperature range of 200−300 °C. Sulfur selectivity and stability of iron oxide catalyst was significantly enhanced by the incorporation of cerium into the catalyst structure. It was concluded that incorporation of ceria into the catalyst structure significantly improved the redox ability of the catalyst. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017059

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