8. Catalyst Deactivation and Regeneration in Benzene Selective Hydrogenation

For a set of 100,000–200,000 t/a industrial plant for benzene selective hydrogenation to produce cyclohexene and its downstream products, the initial loading of Ru catalyst is 200–400 kg for benzene selective hydrogenation, the life expectancy of the catalyst is about 2 years. During the operation of the device, the loss will be significant when the catalyst is inactivated due to improper operation or the introduction of impurities. If the deactivated catalyst cannot be regenerated in situ, it not only needs tens of millions of dollars to replace the catalyst, but also needs to discharge the mother liquor causing pollution. Therefore, it is very important to study the deactivation mechanism of catalyst for benzene selective hydrogenation and the regeneration method to ensure the normal production of industrial production.