Study Of Catalyst Characterization During Residue Hydrotreating And Catalyst Deactivation

It is of great significance for improving Oil utilization efficiency andeasing the tense situation of China's energy to conduct residuehydroprocessing. Catalyst plays an important role on residue hydroprocessing.The effect of catalyst covers every aspect in the reaction system, such aslogistics distribution, hydrodynamics, mass transfer and heat transfer. It willincrease the fluid resistance and disrupt the normal operation if the particlesize is very small. But on the contrary, the activities in the catalyst surface willbe not fully utilized. It will be increase the pressure drop, which will lead tocoke on the bed, if we fill the bed with catalyst of a single specification. So weshould fill the bed with catalyst which have different morphologies. It willdecrease the resistance between beds and increase the utilization of catalysts,which will contribute to exert the activity. It is very meaningful to study the different morphology of the catalyst.The slurry bed hydroprocessing was conducted with the NiMo catalystbased on the mixture of atmospheric and vacuum residue from Daqing Oilfield,in accordance with the requirements of the Petroleum and PetrochemicalInstitute. It is the following operating conditions that has been confirmed bycontrast experiments:50.0g/Oil,10.0g/catalyst,370℃/temperature,7.0MPaof total pressure,400of H2-to-Oil,1h of reaction time and cooling downrapidly after reaction.It has been carried out to evaluate the activity of catalysts with differentdiameters in this condition. The result shows that there is a better rate inimpurities removing. The total activity of catalyst which has a1.2mmdiameter is much better. And then we conducted the further study of catalystdeactivation with XRD, BET, TG/DSC, TPO and SEM/EDS. The result showsthat there are several reasons for catalyst deactivation. There are manydeposits found in the catalyst surface such as asphalt, metalloporphyrins, cokeand metal sulfides. It could cover the active sites and reduce the catalyticactivity, which results in the drop of impurities removing...