High-resolution imaging of nanoparticle bimetallic catalysts supported on mesoporous silica

Although conventional high‐resolution transmission electron microscopy is a powerful method for the elucidation of the structure of mesoporous solids (diameter of pores from 1.5 to 20 nm), it is far less capable than high‐resolution scanning transmission electron microscopy in identifying the spatia...

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Bibliographic Details
Published in:Catalysis letters 1999-01, Vol.60 (3), p.113-120
Main Authors: OZKAYA, D, WUZONG ZHOU, THOMAS, J. M, MIDGLEY, P, KEAST, V. J, HERMANS, S
Format: Article
Language:English
Subjects:
Bimetals
Carbonyls
Catalysis
Catalysts
Catalysts: preparations and properties
Chemistry
Electrons
Exact sciences and technology
General and physical chemistry
Nanocrystals
Nanoparticles
Scanning electron microscopy
Scanning transmission electron microscopy
Silicon dioxide
Size distribution
Spatial distribution
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Transmission electron microscopy
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Summary:Although conventional high‐resolution transmission electron microscopy is a powerful method for the elucidation of the structure of mesoporous solids (diameter of pores from 1.5 to 20 nm), it is far less capable than high‐resolution scanning transmission electron microscopy in identifying the spatial distribution of nanocrystals of catalysts encapsulated within the mesopores. Using high‐angle annular dark‐field imaging (either in a 100 or 300 keV STEM system), it is possible to locate precisely individual bimetallic nanoparticles (Ag3Ru10, Cu4Ru12 and Pd6Ru6 hydrogenation catalysts) supported on mesoporous silica, to determine their size distribution, and to record their characteristic X‐ray emission maps. It is also established that there is little tendency for elemental fragmentation of the bimetallic catalysts, all of which were prepared by decarbonylating, by thermolysis, precursor cluster carbonylate anions: [Ag3Ru10C2(CO)28Cl]−, [Ru6C(CO)16Cu2Cl]2− and [Ru6Pd6(CO)24]2−.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1019046705386