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Redox Activity and NO Storage Capacity of MnOx-ZrO2 with Enhanced Thermal Stability at Elevated Temperatures
Journal article   Peer reviewed

Redox Activity and NO Storage Capacity of MnOx-ZrO2 with Enhanced Thermal Stability at Elevated Temperatures

Qiang Zhao, Wan Y. Shih, Hsiao-Lan Chang and Wei-Heng Shih
Industrial & engineering chemistry research, v 49(4), pp 1725-1731
17 Feb 2010
DOI: https://doi.org/10.1021/ie901234x

Abstract

Engineering Engineering, Chemical Science & Technology Technology
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 degrees 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 degrees 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 degrees C. Correspondingly, La-doped MnOx-ZrO2 mixed oxides show much improved redox activity and NO storage capacity even after 900 degrees C heat treatment.

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Industry collaboration
Domestic collaboration
Web of Science research areas
Engineering, Chemical
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