Fractal Characterization of Wide Pore Range Catalysts: Application to Pd–Ag/SiO2 Xerogels
✍ Scribed by S. Blacher; B. Heinrichs; B. Sahouli; R. Pirard; J.-P. Pirard
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 168 KB
- Volume
- 226
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Fractal analysis has been applied to characterize the structure of Pd-Ag/SiO 2 catalysts dried under vacuum (150 • C and 12 hPa) with different concentrations of Pd-Ag. Nitrogen adsorptiondesorption, mercury porosimetry, and small-angle X-ray scattering measurements have been used. The different approaches to fractal analysis and their conditions of applicability are briefly described. Results are discussed in relation to those derived previously from classical interpretations. This analysis shows that Pd-Ag/SiO 2 xerogels exhibit a very open self-similar pore structure analogous to the structure of supercritically dried aerogels and that the micropore texture can be tailored by varying the silver content.