Removal of Carbonyl Sulfide from Syngas Using a Novel Mixed-Oxide Sorbent

摘要

In order to develop a highly sulfur capacity and reactive COS removal sorbent from syngas, Fe-Mn-Ce oxides were studied in this work. The sorbents can remove COS from 1.5% to less than 0.3 mg/m~3 in appropriate conditions. Sulfur capacity of the fresh sorbent was about 20 gS/100 g sorbent in the temperature of 320-400℃. Tests showed that Fe_2O_3 was reduced to Fe_3O_4 or FeO with the simulated syngas and the presence of Fe_3O_4 can account for the high COS removal efficiency. The reactivity of the sorbent decreased when Fe_3O_4 was partially reduced to FeO. It was found that the desulfurization behavior was also influenced by the calcination temperatures, desulfurization temperatures, and gas compositions. High calcination temperature has a negative effect on the desulfurization performance of the sorbent due to lower BET. Hydrogen favors the desulfurization efficiency, whereas CO exhibits a negative effect on the COS removal.