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Alcohol induced ultra-fine dispersion of Pt on tuned morphologies of CeO2 for CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45823 46423 2013 11 PDF Available
Title
Alcohol induced ultra-fine dispersion of Pt on tuned morphologies of CeO2 for CO oxidation
Abstract

Controlling the structures of supports and supported phases is important for catalytic applications where synergic effects can play a main role. In this context, we present versatile methods for suitable microstructurization of CeO2 support and improved dispersion of supported Pt crystallites in a Pt/CeO2 system for enhanced catalytic oxidation of CO. The physicochemical properties investigated using SEM, BET, visible Raman, H2-TPR and OSC measurements demonstrated the important role played by the precursor on the properties of CeO2. Further, 0.5 wt% Pt deposited over CeO2 via ethylene glycol assisted reduction (EGR) was found to be more advantageous than conventional impregnation (IMP) in producing very finely dispersed Pt particles that did not noticeably sinter even after thermal treatment at 500 °C for longer duration. H2-chemisorption and H2-TPR experiments further substantiated better Pt dispersion on CeO2 prepared in the presence of Cl− ions regardless of the method employed, thus suggesting a strong microstructural effect of support during growth and anti-sintering activity of Pt crystallites. The CO oxidation activity additionally demonstrates that samples prepared by EGR method show remarkably better performance (100% conversion in <100 °C) as compared to their impregnated counterparts (100% conversion at ∼300 °C). The present approach to improve the catalytic activity of Pt/CeO2 based hetero-nanocomposites by finely dispersing low concentrations of Pt nanocrystallites over microstructurally tuned CeO2 support is encouraging in the context of designing novel metal–metal oxide based catalysts for astute potential applicability under vibrantly testing conditions.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Microstructurization of CeO2 is achieved by different anions during synthesis. ► Pt dispersion on CeO2 is improved by slow reduction of H2PtCl6 with ethylene glycol. ► CeO2 support prepared in the presence of Cl− ion induces better Pt dispersion. ► More Pt-CeO2 interfacial sites are responsible for low temperature CO oxidation.

Keywords
CeO2; Surface morphology; Alcohol assisted reduction; Pt dispersion; CO oxidation
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Alcohol induced ultra-fine dispersion of Pt on tuned morphologies of CeO2 for CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 130–131, 7 February 2013, Pages 121–131
Authors
, , , , , ,
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
Online Support
Any Questions? feel free to contact us