Properties of Nanosize Zinc Titanium Desulfurization Sorbents Promoted with Iron and Cerium Oxides

Abstract

To improve the sulfidation and regeneration properties of Zn−Ti-based desulfurization sorbents, sorbents with 5 wt % of the promoters, iron or cerium oxide, were prepared and tested in a packed reactor under intermediate temperature conditions (H2S absorption at 480 °C, regeneration at 580 °C). These sorbents showed excellent sulfur-removing capacities without deactivation even after 10 cycles of absorption and regeneration. Their regeneration properties were also improved by the iron and cerium promoters. In the case of the iron promoter, heat was released when the metal sulfide was converted to the metal oxide, which improved the regeneration property of the Zn−Ti-based sorbent. In the case of the cerium promoter, there was no reaction with hydrogen sulfide gases, and the spent Zn−Ti-based sorbent was easily regenerated by virtue of the OSC (oxygen storage capacity) property of the cerium promoter, which easily converted the S of ZnS to SO2.