Simultaneous Removal of Hg0 and H2S over a Regenerable Fe2O3/AC Catalyst

Simultaneous removal of Hg-0 and H2S over a regenerable activated coke supported Fe2O3 catalyst (Fe2O3/AC) was studied in simulated coal-derived syngas. It was found that the Fe2O3/AC catalyst exhibited high capability for Hg-0 and H2S removal, which was attributed to the catalytic oxidation activity of Fe2O3. Its capability for Hg-0 and H2S removal increased with an increase of Fe2O3 loading amount, and the highest was at 150 degrees C for Hg-0 removal. CO and H-2 showed no obvious effect on Hg-0 removal by Fe2O3/AC, while H2S had a promotion effect, which was due to S and FeSx produced by the H2S reaction on Fe2O3/AC. The results of SEM-EDX and the temperature programmed desorption experiment (TPD) revealed that Fe2O3 played a critical role in Hg-0 oxidation, and HgS was generated upon the reaction of Hg-0 with H2S on Fe2O3/AC. The used Fe2O3/AC catalyst after Hg-0 and H2S removal could be effectively regenerated and still had high capability for Hg-0 and H2S removal.

Automated summary

The simultaneous removal of Hg-0 and H2S in simulated coal-derived syngas using a regenerable activated coke supported Fe2O3 catalyst was studied. Fe2O3/AC demonstrated high capability for Hg-0 and H2S removal, with Fe2O3 playing a critical role in Hg-0 oxidation and the presence of H2S promoting the removal process. The catalyst could be effectively regenerated and maintained high removal capability after use.