共 12 条
Au/C catalyst: Experimental evidence of the coexistence of nanoclusters and larger Au particles
被引:26
作者:
Riello, P
[1
]
Canton, P
[1
]
Benedetti, A
[1
]
机构:
[1] Univ Venice, Dipartimento Chim Fis, I-30123 Venice, Italy
来源:
关键词:
D O I:
10.1021/la9803272
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
In this study, using X-ray diffraction Rietveld analysis, we have determined that a great quantity of very fine particles (< 2 nm) 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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页码:6617 / 6619
页数:3
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