Industrial & Engineering Chemistry Research, Vol.38, No.3, 958-963, 1999
Modification of ZnO-TiO2 high-temperature desulfurization sorbent by ZrO2 addition
To develop a highly reactive and easily regenerable zinc oxide high-temperature desulfurization sorbent, a modification of ZnO-TiO2 by addition of ZrO2 was studied. The metal oxides ZnO-TiO2-ZrO2 were prepared by a coprecipitation 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 % ZnO-50 mol % TiO2 greatly improved the reactivity for H2S removal. Furthermore, the addition of ZrO2 improved its regenerability: the temperature for the regeneration of the sample was decreased to ca. 40 degrees C in the absence of H2O and ca. 75 degrees C in the presence of 10% H2O by the addition of 10% ZrO2.
Keywords:TITANIUM-OXIDE SORBENTS;ZINC-OXIDE;FERRITE;H2S;SULFIDATION;REACTIVITY;DURABILITY;REDUCTION;SOLIDS;GASES