Kinetic Study on High-Temperature HS Removal over Mn-Based Regenerable Sorbent Using Deactivation Model.

The kinetics of high-temperature HS removal over Mn/Al sorbents prepared by co-precipitation method was investigated in a fixed-bed reactor using a deactivation model. The initial sorption rate constant ( ), deactivation rate constant ( ), apparent activation energy ( ), and deactivation energy ( ) were obtained. The and values of Mn/Al sorbents are much higher than those of pure MnO. This indicates that Mn/Al sorbents have higher reactivity on the removal of HS and less diffusion resistance caused by the formation of the sulfided product. The and values for the sorbent with the Mn content (wt %) of 35.4% are 38.18 and 31.05 kJ/mol, respectively. The deactivation model gives excellent predictions for the HS breakthrough curves in the sulfidation-regeneration process.