X-ray emission spectrometry of phase separation in Pt Rh nanoparticles for nitric oxide reduction

Composition determinations of individual sub-10 nm metal particles in Pt Rh/alumina by analytical electron microscopy are consistent with a low-temperature miscibility gap below about 750°C in this system. Pt-rich alloy particles are more active than pure Pt for the reduction of nitric oxide with hy...

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Bibliographic Details
Published in:Ultramicroscopy 1995-04, Vol.58 (1), p.25-34
Main Authors: Lyman, C.E., Lakis, R.E., Stenger, H.G.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Online Access:Get full text
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Summary:Composition determinations of individual sub-10 nm metal particles in Pt Rh/alumina by analytical electron microscopy are consistent with a low-temperature miscibility gap below about 750°C in this system. Pt-rich alloy particles are more active than pure Pt for the reduction of nitric oxide with hydrogen at temperatures ≤ 300°C. Rh-rich particles appear to have low activity for this reaction. Catalysts which contain a bimodal distribution of Pt-rich and Rh-rich particles are not as active as pure Pt. Composition versus size plots of small metal particles appear to comprise a new characterization method for supported metal catalysts.
ISSN:0304-3991
1879-2723
DOI:10.1016/0304-3991(94)00175-M