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Selective catalytic reduction of NOx / Sounak Roy in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9240–9247 Titre : Selective catalytic reduction of NOx : mechanistic perspectives on the role of base metal and noble metal ion substitution Type de document : texte imprimé Auteurs : Sounak Roy, Auteur ; A. Marimuthu, Auteur ; Parag A. Deshpande, Auteur Année de publication : 2009 Article en page(s) : p. 9240–9247 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : NOx  Catalytic  Reduction  Noble  Metal  Ion  Substitution Résumé : Selective catalytic reduction (SCR) of NO by NH3 in presence of excess oxygen is an industrially and environmentally important reaction. Determining a suitable catalyst substituted with noble metals or base metal ions with a suitable reaction mechanism is important. In this study, ionically substituted Mn and Pd in TiO2 catalysts were synthesized by the solution combustion technique and examined for SCR activity. A seven-step reaction mechanism was proposed to incorporate the role of NH3 oxidation in the SCR reaction that shows minima in the NO concentration profile. Both modeling and experimental results show that the reduction of NO in SCR condition follows the order Ti0.9Mn0.1O2-δ > Ti0.89Mn0.1Pd0.01O2-δ > Ti0.99Pd0.01O2-δ. However, the hydrogen uptake study showed that the noble metal ion (Pd2+) substituted TiO2 has better reducibility than the base metal ion (Mn3+) substituted TiO2. The rate of ammonia oxidation by different catalysts followed the reverse order such as that of NO reduction. This clearly indicates that catalysts with higher reducibility and that which exhibit higher rates of ammonia oxidation have poor SCR activity. Thus, the base metal ion substitution is better than noble metal ion substitution for SCR. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010879#afn2 [article] Selective catalytic reduction of NOx : mechanistic perspectives on the role of base metal and noble metal ion substitution [texte imprimé] / Sounak Roy, Auteur ; A. Marimuthu, Auteur ; Parag A. Deshpande, Auteur . - 2009 . - p. 9240–9247. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9240–9247 Mots-clés : NOx  Catalytic  Reduction  Noble  Metal  Ion  Substitution Résumé : Selective catalytic reduction (SCR) of NO by NH3 in presence of excess oxygen is an industrially and environmentally important reaction. Determining a suitable catalyst substituted with noble metals or base metal ions with a suitable reaction mechanism is important. In this study, ionically substituted Mn and Pd in TiO2 catalysts were synthesized by the solution combustion technique and examined for SCR activity. A seven-step reaction mechanism was proposed to incorporate the role of NH3 oxidation in the SCR reaction that shows minima in the NO concentration profile. Both modeling and experimental results show that the reduction of NO in SCR condition follows the order Ti0.9Mn0.1O2-δ > Ti0.89Mn0.1Pd0.01O2-δ > Ti0.99Pd0.01O2-δ. However, the hydrogen uptake study showed that the noble metal ion (Pd2+) substituted TiO2 has better reducibility than the base metal ion (Mn3+) substituted TiO2. The rate of ammonia oxidation by different catalysts followed the reverse order such as that of NO reduction. This clearly indicates that catalysts with higher reducibility and that which exhibit higher rates of ammonia oxidation have poor SCR activity. Thus, the base metal ion substitution is better than noble metal ion substitution for SCR. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8010879#afn2