75.ZnO-TiO_2系高温脱硫剤の再生におけるTiO_2の役割(石炭利用における科学と工学の融合)

抄録

In order to develop an easily regenerable zinc oxide high-temperature desulfurization sorbent the role of TiO_2 on oxidative regeneration of spent ZnO-TiO_2 sorbent was studied using TPR and isotopic H_2^<18>O. It was found that TiO_2 accelerated both the reaction between ZnO and O_2 and the reaction between ZnS and H_2O, and also accelerated the oxidative regeneration of ZnS in the presence of both O_2 and H_2O. Furthermore, the acceleration in the presence of both O_2 and H_2O could be explained by an activation of H_2O over the TiO_2 and spill over of the activated H_2O species.