Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 81, Issue 1-2, Pages 115-121Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2007.12.007
Keywords
MnOx-CeO2 mixed oxides; Pt/MnOx-CeO2 catalyst; complete oxidation; formaldehyde; platinum precursor
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MnOx-CeO2 mixed oxides with a Mn/(Mn + Ce) molar ratios of 0-1 were prepared by a modified coprecipitation method and investigated for the complete oxidation of formaldehyde. The MnOx-CeO2 with Mn/(Mn + Ce) molar ratio of 0.5 exhibited the highest catalytic activity among the MnOx-CeO2 mixed oxides. Structure analysis by X-ray powder diffraction and temperature-programmed reduction of hydrogen revealed that the formation of MnOx-CeO2 solid solution greatly improved the low-temperature reducibility, resulting in a higher catalytic activity for the oxidation of formaldehyde. Promoting effect of Pt on the MnOx-CeO2 mixed oxide indicated that both the Pt precursors and the reduction temperature greatly affected the catalytic performance. Pt/MnOx-CeO2 catalyst prepared from chlorine-free precursor showed extremely high activity and stability after pretreatment with hydrogen at 473 K. 100% conversion of formaldehyde was achieved at ambient temperature and no deactivation was observed for 120 h time-on-stream. The promoting effect of Pt was ascribed to enhance the effective activation of oxygen molecule on the MnOx-CeO2 support. (C) 2007 Elsevier B.V. All rights reserved.
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