Can microwave assisted in situ reduction of supported Pt nanoparticles challenge the chemical method in controlling the dispersion profile-catalytic performance relationship?
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Type
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Journal
Article
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Author
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Ain
Shams University, Abbassia, Egypt Chemistry Department, Faculty of Science
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Author
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Nasr
City, Egypt Catalysis Department, Refining Division, Egyptian
Petroleum Research Institute
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Author
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St.
Dokki, Egypt National Research Centre, Geophysical
Sciences Dept
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URL
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Volume
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5
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Issue
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67
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Pages
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54460-54470
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Publication
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RSC
Advances
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Date
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2015-06-18
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Abstract
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Reports
a study in which Pt was supported on a
mesoporous silica surface via a microwave-assisted solution (MAS) method or
rotary chemical evaporation (RCE) method in the in situ reduction step.
The as-synthesized Pt nanocatalysts were characterized through XRD, XRF, TGA/DSC, TEM, N2-adsorption–desorption, H2-pulse titration and electrical conductivity techniques. The samples prepared by MAS method exhibited higher surface area and a better dispersion profile of Pt NPs, of average sizes not exceeding 10 nm with increasing the Pt loading. In contrast, although RCE method showed higher efficacy in decomposing the used precursor, an uneven distribution of larger Pt nanoparticles was observed. Electrical properties in terms of AC conductivity and dielectric constant confirmed the enhancement of an even distribution of smaller Pt NPs with a higher concentration of grain boundaries effected by microwave electromagnetic radiations. |
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