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The kinetics of high-temperature H 2 S 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 ( k 0 ), deactivation rate constant ( k d ), apparent activation energy ( E a ), and deactivation energy ( E d ) were obtained. The k 0 and k d values of Mn/Al sorbents are much higher than those of pure Mn 2 O 3 . This indicates that Mn/Al sorbents have higher reactivity on the removal of H 2 S and less diffusion resistance caused by the formation of the sulfided product. The E a and E d 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 H 2 S breakthrough curves in the sulfidation-regeneration process., Competing Interests: The authors declare no competing financial interest., (© 2022 The Authors. Published by American Chemical Society.)