Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts - Archive ouverte HAL Access content directly
Journal Articles Journal of Industrial and Engineering Chemistry Year : 2019

Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts

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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.
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Dates and versions

hal-02409000 , version 1 (04-01-2021)

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Pedro S.F. Mendes, João Silva, M. Filipa Ribeiro, Christophe Bouchy, Antoine Daudin. Quantification of the available acid sites in the hydrocracking of nitrogen-containing feedstocks over USY shaped NiMo-catalysts. Journal of Industrial and Engineering Chemistry, 2019, 71, pp.167-176. ⟨10.1016/j.jiec.2018.11.019⟩. ⟨hal-02409000⟩

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