Reduction and Agglomeration of Supported Metal Clusters Induced by High-Flux X-ray Absorption Spectroscopy Measurements

2021 ◽  
Author(s):  
Malik Albrahim ◽  
Coogan Thompson ◽  
Denis Leshchev ◽  
Abhijit Shrotri ◽  
Raymond R. Unocic ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Metal Clusters ◽  
High Flux ◽  
X Ray ◽  
Supported Metal Clusters ◽  
X Ray Absorption ◽  
Supported Metal

Synthesis and Characterization of Supported Metal Cluster Catalysts with Well-Defined Structures

1994 ◽  
Vol 368 ◽  
Author(s):  
B. C. Gates
Keyword(s):  
Metal Clusters ◽  
Metal Cluster ◽  
X Ray ◽  
Coordination Numbers ◽  
Supported Clusters ◽  
Supported Metal Clusters ◽  
X Ray Absorption ◽  
Thermal Decarbonylation ◽  
Supported Metal

ABSTRACTNearly uniform supported metal clusters are the focus of this summary, which addresses their synthesis, characterization, and catalytic properties. Supported clusters represented as Ir4 and Ir6 were prepared on MgO powder by thermal decarbonylation of [HIr4(CO)11]− and [Ir6(CO)15]2−, respectively. The most useful characterization technique for supported clusters is extended X-ray absorption fine structure spectroscopy, but the structure data are limited by the precision of the coordination numbers (about ±20%). Ir4 and Ir6 clusters on supports catalyze hydrogenation of cyclohexene and of toluene, and they are catalytically distinct from larger iridium particles, although the reactions are structure insensitive (proceeding at about the same rate per exposed metal atom) when catalyzed by metal particles larger than about 1 nm. Thus the concept of structure insensitivity does not extend to supported metal clusters, which are regarded as quasi molecular.

Characterization of supported metal catalysts by X-ray absorption spectroscopy

1983 ◽  
Vol 20 (3) ◽  
pp. 389 ◽  
Author(s):  
FarrelW. Lytle ◽  
RobertB. Greegor ◽  
John Sinfelt ◽  
GraysonH. Via
Keyword(s):  
Absorption Spectroscopy ◽  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
X Ray ◽  
X Ray Absorption ◽  
Supported Metal
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