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In situ encapsulation of Pt nanoparticles in mesoporous silica: Synthesis, characterisation and effect of particle size on CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41407 45888 2011 7 PDF Available
Title
In situ encapsulation of Pt nanoparticles in mesoporous silica: Synthesis, characterisation and effect of particle size on CO oxidation
Abstract

Pt nanoparticles of narrow size distribution and average particle size of 4.4 nm are isolated exclusively inside SBA-12 mesoporous silica by a novel in situ method. The interaction of Pt precursor with surfactant–polymer composite micelle is followed by NMR and UV studies. The final Pt incorporated silica material is characterised by XRD, TEM and N2 adsorption. The mesoporous nature of the silica is found to be intact after Pt incorporation without any pore blockage. CO oxidation activity of this material is compared with that of mesoporous silica incorporating different sizes of Pt viz., 1.8, 3.6 and 8 nm. Activation energies of CO oxidation for all these materials are calculated by a simple differential method based on first principles. A comparison of activation energies and single site yields reveals that these parameters are distinguishably less in catalyst containing 1.8 nm Pt nanoparticles but more or less same in catalysts containing 3.6, 4.4 and 8 nm Pt nanoparticles.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (221 K)Download as PowerPoint slideHighlights• Employing mesoporous channels as moulds for in situ synthesis of Pt nanoparticles. • Particles of size 4.4 nm isolated exclusively in the channels of mesoporous silica. • CO oxidation kinetics studied in catalysts with 1.8, 3.6, 4.4 and 8 nm Pt particles. • Particles of size <2 nm behave distinguishably different in CO oxidation.

Keywords
In situ synthesis; Pt nanoparticle; Mesoporous silica; CO oxidation
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In situ encapsulation of Pt nanoparticles in mesoporous silica: Synthesis, characterisation and effect of particle size on CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 403, Issues 1–2, 22 August 2011, Pages 91–97
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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