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Mixed platinum-manganese oxide catalysts for combustion of volatile organic compounds / Aguero, Fabiola N. in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2795–2800 Titre : Mixed platinum-manganese oxide catalysts for combustion of volatile organic compounds Type de document : texte imprimé Auteurs : Aguero, Fabiola N., Auteur ; Barbero, Bibiana P., Auteur ; Manuel Fernando R. Pereira, Auteur Année de publication : 2009 Article en page(s) : pp. 2795–2800 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Mixed  platinum-manganese  oxide  catalysts  Chloroplatinic  acid  solution  Ethanol  combustion  Toluene  combustion Résumé : Mixed platinum−manganese oxide catalysts were prepared by impregnation of supported manganese oxide catalysts with a chloroplatinic acid solution. Supported manganese oxide catalysts used as bare catalysts were prepared from different manganese precursors (nitrate and acetate) and with two manganese loadings. Supported pure platinum catalysts were also prepared as a reference. The catalytic activity was evaluated in ethanol and toluene combustion. Considering the catalysts from the different manganese precursors separately, the catalytic activity increased with increasing platinum dispersion. The platinum dispersion was affected by the presence of basic sites on the surface. Furthermore, at least two different platinum active sites were found to exist on the surface. The sites corresponding to a direct platinum−Al2O3 interaction were more active than those corresponding to a platinum−manganese oxide interaction. Finally, the catalytic tests in the combustion of an ethanol−toluene mixture demonstrated that manganese plays a beneficial role in avoiding the inhibition of toluene combustion that is observed on pure platinum catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801310t [article] Mixed platinum-manganese oxide catalysts for combustion of volatile organic compounds [texte imprimé] / Aguero, Fabiola N., Auteur ; Barbero, Bibiana P., Auteur ; Manuel Fernando R. Pereira, Auteur . - 2009 . - pp. 2795–2800. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2795–2800 Mots-clés : Mixed  platinum-manganese  oxide  catalysts  Chloroplatinic  acid  solution  Ethanol  combustion  Toluene  combustion Résumé : Mixed platinum−manganese oxide catalysts were prepared by impregnation of supported manganese oxide catalysts with a chloroplatinic acid solution. Supported manganese oxide catalysts used as bare catalysts were prepared from different manganese precursors (nitrate and acetate) and with two manganese loadings. Supported pure platinum catalysts were also prepared as a reference. The catalytic activity was evaluated in ethanol and toluene combustion. Considering the catalysts from the different manganese precursors separately, the catalytic activity increased with increasing platinum dispersion. The platinum dispersion was affected by the presence of basic sites on the surface. Furthermore, at least two different platinum active sites were found to exist on the surface. The sites corresponding to a direct platinum−Al2O3 interaction were more active than those corresponding to a platinum−manganese oxide interaction. Finally, the catalytic tests in the combustion of an ethanol−toluene mixture demonstrated that manganese plays a beneficial role in avoiding the inhibition of toluene combustion that is observed on pure platinum catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801310t

Pd − Cu and Pt − Cu catalysts supported on carbon nanotubes for nitrate reduction in water / Olivia Salomé G. P. Soares in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7183–7192 Titre : Pd − Cu and Pt − Cu catalysts supported on carbon nanotubes for nitrate reduction in water Type de document : texte imprimé Auteurs : Olivia Salomé G. P. Soares, Auteur ; José J. M. Orfao, Auteur ; Manuel Fernando R. Pereira, Auteur Année de publication : 2010 Article en page(s) : pp. 7183–7192 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts  Nanotubes  carbon. Résumé : The influence of the preparation conditions on the performance of Pd−Cu and Pt−Cu supported on multiwalled carbon nanotubes for the reduction of nitrates was studied and compared with that obtained using a commercial activated carbon as support. Different preparation conditions lead to different catalytic activities and selectivities. Generally, the activity decreases by increasing the calcination and reduction temperatures for the catalysts supported on the original carbon nanotubes, where the nitrate conversion varies from 67% (noncalcined and nonreduced) to 15% (calcined and reduced at 200 °C) for the pair Pd−Cu after 5 h of reaction; the inverse performance was observed for the catalysts supported on carbon nanotubes previously oxidized with HNO3 and on this same sample heat treated at 400 °C. The functional groups created during the oxidation treatment have a negative effect on the catalyst performance. For all the preparation conditions tested, the Pd−Cu pair is more selective to nitrogen than the pair Pt−Cu; 82% and 37% are the highest values obtained for each pair, respectively. Carbon nanotubes are demonstrated to be a good support for this reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001907 [article] Pd − Cu and Pt − Cu catalysts supported on carbon nanotubes for nitrate reduction in water [texte imprimé] / Olivia Salomé G. P. Soares, Auteur ; José J. M. Orfao, Auteur ; Manuel Fernando R. Pereira, Auteur . - 2010 . - pp. 7183–7192. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7183–7192 Mots-clés : Catalysts  Nanotubes  carbon. Résumé : The influence of the preparation conditions on the performance of Pd−Cu and Pt−Cu supported on multiwalled carbon nanotubes for the reduction of nitrates was studied and compared with that obtained using a commercial activated carbon as support. Different preparation conditions lead to different catalytic activities and selectivities. Generally, the activity decreases by increasing the calcination and reduction temperatures for the catalysts supported on the original carbon nanotubes, where the nitrate conversion varies from 67% (noncalcined and nonreduced) to 15% (calcined and reduced at 200 °C) for the pair Pd−Cu after 5 h of reaction; the inverse performance was observed for the catalysts supported on carbon nanotubes previously oxidized with HNO3 and on this same sample heat treated at 400 °C. The functional groups created during the oxidation treatment have a negative effect on the catalyst performance. For all the preparation conditions tested, the Pd−Cu pair is more selective to nitrogen than the pair Pt−Cu; 82% and 37% are the highest values obtained for each pair, respectively. Carbon nanotubes are demonstrated to be a good support for this reaction. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1001907