n this study, using X-ray diffraction Rietveld analysis, we have determined that a great quantity of very fine particles (<2nm) can be present in a supported metal catalyst, but that they are almost undetectable if larger particles (even a very small fraction) are contained in the sample. The large amount of hidden fine particles found in the discussed catalyst convinced us that, probably, such a nanostructure could be characteristic of catalysts containing a low percentage of metal. Since heterogeneous catalysis is a surface phenomenon, it is clear that losing great fractions of nanoparticles biases the microstructural study, and hence, the understanding of the catalytic working mechanism.
|Titolo:||Au/C catalyst: Experimental evidence of the coexistence of nanoclusters and larger Au particles|
|Data di pubblicazione:||1998|
|Appare nelle tipologie:||2.1 Articolo su rivista |
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