Abstract
The activities of base metal oxides comprising 27 % MnO2, 21 % CeO2, and 52 % Al2O3 supported on cordierite monoliths calcined at 1,000 °C for 3 h in air dropped very rapidly due to the migration of mobile silicon dioxide (SiO2) from the cordierite to the base metal oxides to react with or physically block the active catalysts. After immobilizing migrating SiO2, cordierite-supported base metal oxides catalysts pretreated with BaO–Al2O3 barrier coats and calcined at 1,000 °C for 3 h in air, initiated the oxidation of HCHO, CH3OH, and CO at 150, 170, and 220 °C, respectively. These catalysts turned out to be more effective for the formaldehyde oxidation than 0.5 % Pt/Al2O3 precious metal catalysts. The incorporation of small amount of palladium (0.147 wt%) to cordierite-supported base metal oxides pretreated with BaO–Al2O3 barrier coats, showed the superiority for HCHO, CH3OH, and CO oxidation to 0.5 % Pt/Al2O3 precious metal catalysts. The temperatures of 50 % conversion of formaldehyde, methanol, and carbon monoxide were 70 °C lower over base metal oxides catalysts than over precious metal catalysts.
Graphical Abstract
Cordierite-supported Mn–Ce–Al oxides.
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Acknowledgments
This work was supported by the Konkuk University in 2010. We wish to thank Dr. A. Stiles for suggesting preparative methods for the laboratory-prepared catalysts.
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Park, S.M., Jeon, S.W. & Kim, S.H. Formaldehyde Oxidation Over Manganese–Cerium–Aluminum Mixed Oxides Supported on Cordierite Monoliths at Low Temperatures. Catal Lett 144, 756–766 (2014). https://doi.org/10.1007/s10562-014-1207-7
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DOI: https://doi.org/10.1007/s10562-014-1207-7