The reduction, sulfidation and regeneration characteristics of high temperature desulfurization sorbents composed of zinc oxide titanium oxides have been studied in a TGA reactor. The addition of titanium oxides significantly reduced zinc oxide reduction and subsequent volatilization of metallic zinc and increased the maximum sorbent operating temperature. In the temperature range of primary interest(650-750℃) the conversion for the sulfidation reaction was independent of reaction temperatures, while the conversion for regeneration was a relatively weak function of reaction temperature. Also, the reaction between H2S and a single cylindrical pellet of zinc titanate sorbent was described by a special case of the unreacted core model in which the global reaction rate is controlled by mass transfer and product layer diffusion resistances. The temperature dependence of the mass transfer coefficient and the effective diffusivity could be calculated from experimental data.