Microkinetics of H_2S Removal by Zinc Oxide in the Presence of Moist Gas Atmosphere

摘要

The microkinetics of H_2S removal by ZnO desulfurization in H_2O-CO_2-N_2, H_2O-CO-N_2 and H_2O-O_2-N_2 gas mixtures was studied by thermogravimetric analysis. Experiments were carried out with 100-120 mesh ZnO powder at temperatures from 473 K to 563 K. The results show that the kinetic behaviors of desulfurization could all be described by an improved shrinking-core model. The activation energies of the reaction and the diffusion in different gas atmosphere's were estimated.