 |
Journal articles
Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts
Abstract : 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.
https://hal-ifp.archives-ouvertes.fr/hal-02409000
Contributor : Nadine Couëdel <>
Submitted on : Monday, January 4, 2021 - 2:50:04 PM
Last modification on : Thursday, January 7, 2021 - 12:37:08 PM
Long-term archiving on: : Monday, April 5, 2021 - 8:30:15 PM
Contributor : Nadine Couëdel <>
Submitted on : Monday, January 4, 2021 - 2:50:04 PM
Last modification on : Thursday, January 7, 2021 - 12:37:08 PM
Long-term archiving on: : Monday, April 5, 2021 - 8:30:15 PM