%0 Journal Article %T Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts %+ Instituto Superior Técnico, Universidade Técnica de Lisboa %+ IFP Energies nouvelles (IFPEN) %+ Instituto Superior de Engenharia de Lisboa (ISEL) %A Mendes, Pedro S.F. %A Silva, João %A Ribeiro, M. Filipa %A Bouchy, Christophe %A Daudin, Antoine %< avec comité de lecture %@ 1226-086X %J Journal of Industrial and Engineering Chemistry %I Elsevier %V 71 %P 167-176 %8 2019-03 %D 2019 %R 10.1016/j.jiec.2018.11.019 %K hydrocracking %K HUSY zeolite %K catalyst deactivation %K ammonia %K operando Brønsted acidity %K bifunctional catalyst %Z Chemical Sciences/Chemical engineeringJournal articles %X 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. %G English %2 https://ifp.hal.science/hal-02409000/document %2 https://ifp.hal.science/hal-02409000/file/Quantification-accepted.pdf %L hal-02409000 %U https://ifp.hal.science/hal-02409000 %~ IFP