关键词: S Zorb吸附剂, 吸附脱硫, 表征, 失活, 锌铝尖晶石, 硅锌矿, FCC汽油脱硫

Abstract: Aiming at investigating the causes of fast deactivation and high consumption of sorbent in S Zorb process, the physicochemical properties of various sorbent samples were characterized by SEM, XRD, XRF, XPS and MAS-NMR techniques systemically. During the operation of S Zorb unit, the amount of active ZnO decreases significantly, due to the formation of non-activated gahnite, such as zinc aluminate, Willemite and etc. As long as the amount of active ZnO is not enough to support the transfer of sulfur containing compounds in gasoline, the sorbent is deactivated and its desulfurization function diminishes. In addition, the formation of zinc aluminate in sorbent may cause the particles to be fragile, thus the consumption of sorbent increases. It is suggested that monitoring the phase changes of spent and regenerated sorbent will be helpful to ensure an effective and stable running of the S Zorb unit.

Key words: S Zorb sorbent, deactivation, characterization, FCC gasoline desulfuration, Gahnite, Willemite