KINETIC-MODEL AND ANALYSIS METHOD OF CATA LYST DEACTIVATION IN HYDRODESULFURIZATION OF LIGHT AND HEAVY OILS

Catalyst deactivation in hydrodesulfurization (HDS) of petroleum disti llates is caused by coking alone but deactivation in HDS of residue is due to a combination of coking and the deposition of metals, such as Ni and V. The objective of the present study is to determine the HDS a ctivity of commercial catalysts affected by coke, metals and so on. Ac cording to a long term test for catalyst deactivation using light gas oil, vacuum gas oil and atmospheric residue, we proposed a kinetic mod el of simple simultaneous equations that supposed the mechanism of cat alyst deactivation as a first-order reduction of different active site s in HDS of light and heavy oils. We hypothesized that the deactivatin g species are composed of two types: one that loses activity easily an d the other that does not and derived an analysis method. This deactiv ation equation could successfully express the deactivation behaviors i n extensive HDS, and was confirmed to be applicable to the various cat alyst deactivations of light and heavy oils.