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.

Au/C catalyst: Experimental evidence of the coexistence of nanoclusters and larger Au particles

RIELLO, Pietro;CANTON, Patrizia;BENEDETTI, Alvise
1998

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/4019
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