CO oxidation catalyzed by Ag/SBA-15 catalysts: Influence of the hydrothermal treatment - 01/07/14
pages | 10 |
Iconographies | 9 |
Vidéos | 0 |
Autres | 0 |
Abstract |
Four types of SBA-15 were prepared with different times and temperatures of treatment in order to obtain a range of micropore sizes. CO oxidation was used as a probe reaction in order to evaluate the nature of the active species when SBA-15s were doped with ca 10% Ag deposited from an AgNO3 solution and calcined or reduced at 350°C. The texture (TEM, nitrogen physisorption), structure (XRD) and reducibility (TPR) of the various catalysts (Ag/SBA-15) were studied and compared to those of a catalyst prepared by deposition of silver on fumed silica as a reference. These catalysts differ initially by the nature of silica and by pore sizes. In CO oxidation, pre-reduced catalysts are more active than pre-oxidised ones. This has to do with two phenomena, i.e. sintering, which produces large inactive silver particles, and formation of active silver species in the form of small Ag2O particles.
Le texte complet de cet article est disponible en PDF.Keywords : SBA-15, Silver catalysis, CO oxidation, Silver nano-particles, Double-solvent technique
Plan
☆ | Thematic issue devoted to François Garin. |
Vol 17 - N° 7-8
P. 775-784 - juillet 2014 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’achat d’article à l’unité est indisponible à l’heure actuelle.
Déjà abonné à cette revue ?