Modification of ZnO-TiO2 high-temperature desulfurization sorbent by ZrO2 addition

To develop a highly reactive and easily regenerable zinc oxide high-tempera ture desulfurization sorbent, a modification of ZnO-TiO2 by addition of ZrO 2 was studied. The metal oxides ZnO-TiO2-ZrO2 were prepared by a coprecipit ation method: the amount of ZnO was a fixed 50 mol % of the sample. In this study, it was found that the addition of 5 or 10 mol % ZrO2 to 50 mol % Zn O-50 mol % TiO2 greatly improved the reactivity for H2S removal. Furthermor e, the addition of ZrO2 improved its regenerability: the temperature for th e regeneration of the sample was decreased to ca. 40 degrees C in the absen ce of H2O and ca. 75 degrees C in the presence of 10% H2O by the addition o f 10% ZrO2.