Abstract: The pore structure, crystal structure and surface acid properties of commercial fresh, deactivated and regenerated catalysts for olefin removal were studied by means of N₂ adsorption-desorption, XRD, NH₃-TPD and Py-IR, the commercial deactivated catalyst were characterized by TG and ¹³C NMR, and the organic composition in toluene-ethanol washing solution of deactivated catalyst was analyzed by FT-IR. The deolefinization activity of commercial fresh, deactivated and regenerated catalysts was evaluated by using catalytic reforming C₈+ aromatics as raw materials. The results showed that the specific surface area and pore volume of the deactivated catalyst decreased significantly, the average pore size increased, the total acid content decreased, and the acid strength of B acid and L acid decreased significantly. The main cause of deactivation of the deolefinization catalyst was the carbon (coke) deposited on the surface and in the pores of the catalyst. The carbon (coke) was mainly formed by the condensation of aromatics and assisted by the condensation of olefin. After regeneration, the specific surface area, pore volume, total acid amount, B acid and L acid amount recovered basically to the level of fresh catalyst, and the initial deolefinization activity restored to 96 %.

Key words: C₈+ aromatics, deolefin, Y zeolite catalyst, deactivation, regeneration