Abstract: Desulfurization at medium and high temperature is a key technique for improving utilization factor of cleaning coal. Mnbased sorbent used for hot gas was investigated in this experimental study. The performance of Mn-based sorbent was studied from sintering temperature, sulfidation temperature, sulfidation gas and initial H₂S concentration in the fixed-bed reactor. The experimental results show that H₂S could be removed to 2×10^-6 by the sorbents sintered at 1 100 ℃,also showing good mechanical strength. Desulfurization of the sorbent performed at 700 ℃ was shown to have the best performance, and sulfur capacity was 31.8%. H₂S concentration in the outlet gas from reactor increased with the presence of CO₂ that increased the oxygen potential. The concentration of H2S in the outlet increased from 2×10^-6 to 20×10^-6 when CO² content increased from 0% to 4.53%. The desulfurization precision did not vary with the increase of initial H₂S concentration, while the duration of the breakthrough period was cut shorter.

Key words: desulfurization performance, hot gas, manganese-based sorbent