458206 Study of Copper-Based Commercial Sorbent for Desulfurization of Syngas at Warm Temperature
In this study, a commercial sorbent with particle size of 30~50 mesh is used for removing hydrogen sulfide from syngas (containing 1% vol. H2S) down to ppm levels in a fixed-bed reactor. The effect of regeneration temperature and cycles of sorption-regeneration on the sulfur capacity were studied as reference to build an operation strategy. The XRD analysis indicates that sulfidation process occurs in partial reduction under reducing atmospheres, i.e., CuO → Cu/Cu2O → CuxS (x ≤ 2). The copper-based sorbent maintains excellent sulfur removal efficiency (above 90% of initial content) during ten adsorption-regeneration cycles at higher regeneration temperature. The results show that the amount of sulfate decreases as regeneration temperature increases. Considering the trend that energy consumption increases as regeneration temperature increases, a big gap between sulfidation and regeneration temperature results in efficiency decrease. The study shows that the performances of the copper-based commercial sorbent seem to be promising for application in syngas desulfurization. It is necessary to decrease regeneration temperature and minimize sulfate formation by introducing a suitable additive in future work.