Deactivation Kinetics Model for Diesel Aromatics Hydrogenation Under Accelerated Catalyst Deactivation

Using mixed diesel oils as the feedstock, dicscl hydrogenation catalysts were treated by the accelerated catalyst deactivation method on a medium-sized fixed bed hydrogenation experimental device. On this basis, the aromatic hydrogenation saturation reaction patterns under the action of NiMo catalyst in diesel with different activities are analyzed and compared. The results show that as compared with fresh catalysts, the catalysts obtained by the accelerated deactivation method were significantly deactivated, and the catalyst activity loss increased with the increasing reaction time and decreasing hydrogen-to-oil volume ratio. A three-lumped deactivation kinetics model for polycyclic aromatic hydrocarbons hydrosaturation was established based on the catalyst activity loss, and the calculated activation coefficients in the accelerated deactivation experiments were correlated with the reaction time and hydrogen-oil volume ratio to obtain a model of activation coefficients for diesel aromatics hydrogenation saturation. Moreover, the changes of PAHs contents under different activation coefficients were calculated by the deactivation kinetics model. © 2024 Editorial Office of Acta Petrolei Sinica. All rights reserved.