Char‐supported Fe–Zn–Cu sorbent prepared by ultrasonic‐assisted impregnation for simultaneous removal of H2S and COS from coke oven gas

Abstract

Lignite char supported Fe–Zn–Cu sorbents were prepared by ultrasonic‐assisted impregnation method for the simultaneous removal of H2S and COS from coke oven gas (COG). Sulfidation experiments were carried out in a fixed‐bed quartz reactor using simulated COG. The results showed that the addition of Cu can significantly increase the sulfidation reactivity of char‐supported Fe–Zn sorbents. Char‐supported Fe–Zn–Cu sorbents with Fe:Zn:Cu molar ratio of 2:1:0.5 could simultaneously remove H2S and COS in the temperature range of 200–400°C. The sulfur capacity reached to 17.62 g S per 100 g sorbent at 400°C. The X‐ray diffraction (XRD) analysis suggested that the addition of Cu into the Fe–Zn sorbent leads to the formation of composite oxides. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 352–358, 2016