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Bimetallic nanoparticles of PtM (M = Au, Cu, Ni) supported on iron oxide: Radiolytic synthesis and CO oxidation catalysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
41803 45900 2010 8 PDF Available
Title
Bimetallic nanoparticles of PtM (M = Au, Cu, Ni) supported on iron oxide: Radiolytic synthesis and CO oxidation catalysis
Abstract

Bimetallic composite nanoparticles of PtM (M = Au, Cu or Ni) supported on γ-Fe2O3 were synthesized by a radiolytic method employing a 4.8-MeV electron beam to reduce aqueous ions. These composite particles were obtained at room temperature just by irradiating glass vials containing source materials in an aqueous system without using any surfactant, organic solvent and stabilizer. The irradiation, taking several seconds, formed metallic nanograins of 3 nm in diameter stabilized on the support of γ-Fe2O3 particle of 13 nm in diameter. XRD patterns of PtAu and PtCu samples showed clear peak shifts indicating occurrence of random alloy phase. X-ray absorption fine structure analysis for the PtCu and PtNi samples indicated significant Pt–M coordination. Catalytic activity of CO oxidation of the samples was evaluated by measuring residual CO contents in air in contact with the sample material with a gas-chromatograph. All the PtM systems exhibited activities higher than those of monolithic Pt on γ-Fe2O3. The correlation between the atomic structures and the catalytic activities indicated that the random alloy structure enhances the activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (151 K)Download as PowerPoint slideResearch highlights▶ Radiolytic one-pot aqueous process without surfactant, solvent, heating. ▶ Intense irradiation induces alloyed grains with enhanced CO oxidation catalysis. ▶ Feasible for mass production at commercial facility, already 1-g powder in a few min. ▶ All proceed in aqueous phase, providing naked metallic surface.

Keywords
CO oxidation; Bimetallic catalyst; Radiolytic synthesis; Platinum; Copper
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Bimetallic nanoparticles of PtM (M = Au, Cu, Ni) supported on iron oxide: Radiolytic synthesis and CO oxidation catalysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 387, Issues 1–2, 20 October 2010, Pages 195–202
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
Online Support
Any Questions? feel free to contact us