M. Hatori et al., Role of TiO2 on oxidative regeneration of spent high-temperature desulfurization sorbent ZnO-TiO2, IND ENG RES, 40(8), 2001, pp. 1884-1890
To develop an easily regenerable high-temperature desulfurization sorbent,
the role of TiO2 in the course of oxidative regeneration of ZnO-TiO2 in the
presence of O-2 and H2O was studied. ZnO-TiO2 and ZnO were prepared by a p
recipitation method using aqueous solutions of Zn-(NO3)(2) Ti(SO4)(2), TiO2
sol, and NH3. The oxidative regeneration character of the spent ZnO-TiO2 a
nd ZnO was examined using a temperature-programmed reaction technique and i
sotopic (H2O)-O-18. It was found that TiO2 accelerated both the reaction be
tween ZnS and O-2 and the reaction between ZnS and H2O and also accelerated
the oxidative regeneration of ZnS in the presence of both O-2 and E H2O. F
urthermore, the acceleration in the presence of both O-2 and H2O could be e
xplained by an activation of H2O over TiO2 and spillover of the activated H
2O species.