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Effect of the CeO2 content on the surface and structural properties of CeO2–Al2O3 mixed oxides prepared by sol–gel method

Paper ID Volume ID Publish Year Pages File Format Full-Text
41817 45901 2010 12 PDF Available
Title
Effect of the CeO2 content on the surface and structural properties of CeO2–Al2O3 mixed oxides prepared by sol–gel method
Abstract

Mixed xCeO2–Al2O3 oxides with different CeO2 content (x = 1–20 wt%) were prepared by sol–gel method. The effect of the CeO2 content, atmosphere and temperature treatment during synthesis on the structure and properties of the xCeO2–Al2O3 was investigated. xCeO2–Al2O3 xerogels prepared from aluminum tri-sec-butoxide and Ce(III) nitrates have a pseudo boehmite-like structure. The Ce(III) ions stabilized under a reductive atmosphere randomly occupy vacant sites in tetrahedral and octahedral positions of Al2O3. The crystallization of γ-Al2O3 is suppressed and the textural properties of the mixed xCeO2–Al2O3 oxides are stabilized at high temperature. Conversely, the treatment xCeO2–Al2O3 xerogels in an oxidative atmosphere shows a progressive oxidation of Ce(III) to Ce(IV) with crystallization of γ-Al2O3 and formation of CeO2 with fluorite-like structure as the temperature rises. The effect of CeO2 on the catalytic performance xCeO2–Al2O3-supported Pt catalysts in partial oxidation of methane reaction was tested. The Pt catalysts were obtained by two methods: (i) impregnation of the xCeO2–Al2O3 supports with H2PtCl6·6H2O and (ii) one-step preparation by addition of Pt precursor during the sol–gel synthesis. CeO2-containing catalysts showed higher stability than Pt/Al2O3 catalyst obtained by impregnation method. The effect of the support was less evident when the catalysts were obtained by the one-step method. Pt catalysts based on sol–gel oxides preparation show higher thermal stability and result in higher Pt sintering resistance than conventional ones.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (125 K)Download as PowerPoint slideResearch highlights▶ The xerogels of Al(III) and Ce(III) with boehmite-like structure is obtained by sol–gel method. ▶ The structure of CeO2–Al2O3 mixed oxides is strongly dependent of temperature and atmosphere. ▶ Pt/CeO2–Al2O3 catalysts based on sol–gel preparation have increasing expectative about wide application.

Keywords
Sol–gel method; Cerium oxide; Mixed oxides; Physicochemical characterization; Partial oxidation of methane
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Effect of the CeO2 content on the surface and structural properties of CeO2–Al2O3 mixed oxides prepared by sol–gel method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 388, Issues 1–2, 20 November 2010, Pages 45–56
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us