Kinetic modeling of nitrate reduction catalyzed by Pd – Cu supported on carbon nanotubes / Olivia Salomé G. P. Soares in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4854–4860 Titre : Kinetic modeling of nitrate reduction catalyzed by Pd – Cu supported on carbon nanotubes Type de document : texte imprimé Auteurs : Olivia Salomé G. P. Soares, Auteur ; Xiaolei Fan, Auteur ; José J. M. Orfao, Auteur Année de publication : 2012 Article en page(s) : pp. 4854–4860 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalysts Liquid phase Nanotubes Résumé : New catalysts for liquid phase nitrate reduction were recently synthesized using multiwalled carbon nanotubes as a support. The most promising catalyst (1%Pd–1%Cu/CNT) was used in this kinetic study. The catalyst experimentally showed high selectivity to nitrogen, between 80 and 89%. A mechanistic model was applied to experimental data to show that the reason for high selectivity is due to the enhanced mass transfer near the catalyst surface promoted by the use of a structured support. The experimental selectivity is close to the maximum selectivity predicted for this catalytic system at the best operating conditions and in the absence of any mass transfer limitations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202957v [article] Kinetic modeling of nitrate reduction catalyzed by Pd – Cu supported on carbon nanotubes [texte imprimé] / Olivia Salomé G. P. Soares, Auteur ; Xiaolei Fan, Auteur ; José J. M. Orfao, Auteur . - 2012 . - pp. 4854–4860. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4854–4860 Mots-clés : Catalysts Liquid phase Nanotubes Résumé : New catalysts for liquid phase nitrate reduction were recently synthesized using multiwalled carbon nanotubes as a support. The most promising catalyst (1%Pd–1%Cu/CNT) was used in this kinetic study. The catalyst experimentally showed high selectivity to nitrogen, between 80 and 89%. A mechanistic model was applied to experimental data to show that the reason for high selectivity is due to the enhanced mass transfer near the catalyst surface promoted by the use of a structured support. The experimental selectivity is close to the maximum selectivity predicted for this catalytic system at the best operating conditions and in the absence of any mass transfer limitations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202957v

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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]  inIndustrial & 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

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