Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts
Résumé
The inhibition of Brønsted acid sites by nitrogen-containing molecules was quantified under industrially relevant hydrocracking conditions. This was achieved by testing bifunctional catalysts based on HUSY zeolite in cyclohexane hydroconversion. For ammonia partial pressures within 0.2-2.8 kPa, the percentage of inhibited Brønsted sites was superior to 98% at 623 K. Significant reduction in the ammonia content caused rather moderate variations on the number of available sites. Conversely, a temperature raise from 600 to 640 K triplicated the vacant Brønsted sites due to the significant endothermicity of ammonia desorption. The inhibiting effect of ammonia can be therefore easily modulated by temperature.
Fichier principal
Quantification-accepted.pdf (1.03 Mo)
Télécharger le fichier
SI Quantification.pdf (443.03 Ko)
Télécharger le fichier
Origine | Fichiers produits par l'(les) auteur(s) |
---|