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Ordered intermetallic Pt–Cu nanoparticles for the catalytic CO oxidation reaction

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Title Ordered intermetallic Pt–Cu nanoparticles for the
catalytic CO oxidation reaction
 
Creator Govindachetty, Saravanan
Khobragade, Rohini
Nagar, Laxmichand
Labhsetwar, Nitin
 
Subject Air Pollution
Air Pollution Control
Environmental Pollution
Chemistry, Chemical Technology
Materials Science
 
Description Platinum-based intermetallic nanoparticles (NPs), using the abundantly available element copper, with an
average particle size of 4–5 nm on a g-Al2O3 support were prepared successfully to reduce the
consumption of Pt for the removal of CO through the catalytic oxidation reaction from flue gases.
Intermetallic Pt–Cu NPs (Pt3Cu, PtCu, and PtCu3) with a Pt loading weight of 5 wt% were prepared on
the g-Al2O3 support by a simple wet impregnation method followed by calcination at various
temperatures (500–800 �C) in a H2 environment and they were characterized by powder X-ray
diffraction analysis (pXRD), high resolution transmission electron microscopy (HR-TEM), selective area
electron diffraction (SAED) method, etc. Despite the higher synthesis temperature of these intermetallic
NPs, they were not agglomerated and formed a highly ordered intermetallic structure. The surface of the
intermetallic Pt–Cu NPs with cubic-type structure (Pt3Cu and PtCu3) is enclosed of {200} facets,
regardless of the significant difference in their compositions. Whereas the surface of rhombohedral-type
intermetallic PtCu NPs is enclosed of {104} facets. Although the Pt-loading weight of these intermetallic
NPs was the same, Pt3Cu NPs showed a stable and enhanced catalytic activity compared to the other
intermetallic PtCu and PtCu3 NPs. Pt3Cu NPs showed an onset and maximum conversion temperature of
50 and 125 �C, respectively. The intermetallic phase between Pt and Cu of Pt3Cu NPs did not
decompose; however, the intermetallic phase did decompose for PtCu and PtCu3 NPs after catalytic CO
oxidation. Unlike PtCu and PtCu3 NPs, the Pt3Cu NPs were not agglomerated and they were finely
dispersed even after catalytic CO oxidation.
 
Publisher RSC
 
Date 2016-08-24
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/953/1/RSC%20Advancs_NEERI.pdf
Govindachetty, Saravanan and Khobragade, Rohini and Nagar, Laxmichand and Labhsetwar, Nitin (2016) Ordered intermetallic Pt–Cu nanoparticles for the catalytic CO oxidation reaction. RSC Advances, 6 (88). pp. 85634-85642. ISSN 2046-2069
 
Relation http://pubs.rsc.org/
http://neeri.csircentral.net/953/