Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H2S at Low Temperature

摘要

Fe/activated carbon desulfurizer is prepared by precipitation method using activated carbon as carrier to remove H2S. The desulfurizer before and after desulfurization was characterized by XRD, XPS, SEM and N(2)adsorption-desorption. The results show that the active component of desulfurizer is Fe2O3, which reacts with H2S to form FeS, elemental sulfur and Fe-2(SO4)(3). The sulfide block the pores, causing the specific surface area, pore volume and fractal dimension to decrease after desulfurization. The effects of gas flow rate, particle size and temperature on the removal of H2S were investigated by solid-bed reactor. Based on the above experimental data, an improved unreacted shrinking core model is used to study the kinetics of Fe/activated carbon desulfurization at low temperature. The improved unreacted shrinking core model is used to analyzing experimental data, in which the activation energies of surface reaction and internal diffusion were determined to be 0.8801 and 3.301 kJ/mol, respectively.