Influence of the Preparation Method on the Surface Characteristics and Activity of Boron-Nitride-Supported Noble Metal Catalysts
| Autor: | Antonella Gervasini, Aline Auroux, G. Postole, Bernard Bonnetot, C. Guimon |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Thermogravimetric analysis
Inorganic chemistry chemistry.chemical_element Diglyme engineering.material Surfaces Coatings and Films Catalysis chemistry.chemical_compound Adsorption chemistry Materials Chemistry engineering Noble metal Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Dispersion (chemistry) Palladium |
| Zdroj: | The Journal of Physical Chemistry B. 110:12572-12580 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp060183x |
| Popis: | In this article, we report how variations in the preparation method of boron-nitride-supported noble metal catalysts may influence the surface characteristics of the active phase and consequently the potential applications as catalysts for oxidation reactions. The deposition and the dispersion of the active phase are strongly influenced by the preparation process and in particular by the protic or aprotic solvent used as the dispersing phase; in this study, benzene, glyme, water, tetrahydrofuran, diglyme, 2-propanol, and glycol have been investigated. Characterization techniques, such as Brunauer-Emmett-Teller, X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis, have been used to study the influence of the choice of a solvent phase on the particle size and dispersion of the metal deposited on the BN support. The modifications undergone by the support during the deposition of palladium in different solvents have also been studied. Through the use of the same deposition procedure, different noble metal coatings (Pt, Pd, Au, and Ag) have been prepared. The acidic and redox characteristics of the resulting samples were characterized by temperature-programmed reduction and adsorption microcalorimetry. The catalytic performances of these materials were tested in the total oxidation of methane in lean conditions (excess oxygen and presence of water). |
| Databáze: | OpenAIRE |
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