Continuous operation was performed at high pressure and high temperature to see the long-term reactivity and the attrition resistance of the sorbent, the reliability of the process in a bench-scale KIER fluidized hot gas desulfurization process. A spray dried sorbent consisting of zinc-oxide and titanium oxide was used. The pressure was maintained at 5 atm, the temperatures were 600 ℃ in a desulfurizer and 700 ℃ in the the regenerator. Solids were circulated continuously and stably between two fluidized reactors at high pressure. The H2S concentration at exit was consistently maintained for 100 hours below 40 ppmv for a simulated coal gas containing 7,700 ppm H2S. The analysis of solid samples, such as densities, sulfur content, SEM, Mercury pore analysis, BET, size distribution, were contributed to uncover the characteristics of reactions and entrainment in two fluidized bed reactors