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Redox activity and NO storage capacity of MnOx−ZrO2 with enhanced thermal stability at elevated temperatures / Zhao, Qiang in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1725–1731 Titre : Redox activity and NO storage capacity of MnOx−ZrO2 with enhanced thermal stability at elevated temperatures Type de document : texte imprimé Auteurs : Zhao, Qiang, Auteur ; Shih, Wan Y., Auteur ; Chang, Hsiao-Lan, Auteur Année de publication : 2010 Article en page(s) : pp 1725–1731 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxides  MnOx  ZrO2  Redox  Heat  treatment. Résumé : MnOx−ZrO2 mixed oxides are very active catalysts for oxidation or combustion applications due to their excellent redox activity. Recently, they have also shown promising results for NO storage in emission control. Despite the versatile applications, a systematic study on the redox activity and NO storage capacity of MnOx−ZrO2 with their thermal stability at high temperatures is still missing. In this paper the evolution of these properties in the temperature range 500−900 °C is reported. It was found that there is a dramatic deterioration in redox activity and NO storage capacity when the calcination temperature increases to 900 °C, which is attributed to the loss of thermal stability at this high temperature. On the other hand, doping with La can hinder the sintering of MnOx−ZrO2 particles and therefore increase the surface area of the mixed oxides calcined at 900 °C. Correspondingly, La-doped MnOx−ZrO2 mixed oxides show much improved redox activity and NO storage capacity even after 900 °C heat treatment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901234x [article] Redox activity and NO storage capacity of MnOx−ZrO2 with enhanced thermal stability at elevated temperatures [texte imprimé] / Zhao, Qiang, Auteur ; Shih, Wan Y., Auteur ; Chang, Hsiao-Lan, Auteur . - 2010 . - pp 1725–1731. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1725–1731 Mots-clés : Oxides  MnOx  ZrO2  Redox  Heat  treatment. Résumé : MnOx−ZrO2 mixed oxides are very active catalysts for oxidation or combustion applications due to their excellent redox activity. Recently, they have also shown promising results for NO storage in emission control. Despite the versatile applications, a systematic study on the redox activity and NO storage capacity of MnOx−ZrO2 with their thermal stability at high temperatures is still missing. In this paper the evolution of these properties in the temperature range 500−900 °C is reported. It was found that there is a dramatic deterioration in redox activity and NO storage capacity when the calcination temperature increases to 900 °C, which is attributed to the loss of thermal stability at this high temperature. On the other hand, doping with La can hinder the sintering of MnOx−ZrO2 particles and therefore increase the surface area of the mixed oxides calcined at 900 °C. Correspondingly, La-doped MnOx−ZrO2 mixed oxides show much improved redox activity and NO storage capacity even after 900 °C heat treatment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901234x