Insight into the effect of SO2 on the Hg0 removal performance over a 1V-8Ce/AC sorbent at low temperatures

The influences of SO2 on Hg degrees removal over the 1V-8Ce/AC sorbent were systematically investigated at low temperatures. The experimental results showed that SO2 has a dual effect on Hg degrees removal, that is, SO2 has both a promoting effect and an inhibiting effect on Hg degrees removal. The SO2 transient response experiment indicated that SO2 could not only react with Hg degrees to promote the removal of Hg degrees but also react with the active components and poison the sorbent. O-2 is indispensable for the removal of Hg degrees, which can offset the adverse effects caused by SO2 and H2O. HCl exhibited an obvious promoting effect on Hg degrees removal in the presence of SO2. The 1V-8Ce/AC sorbent exhibited good sulfur resistance and excellent stability (EHg = 90.04 %) after a 24 h reaction performed under the 1000 ppm SO2 condition at 150 degrees C. In addition, the Hg-TPD and XPS methods were used to assist in studying the effect of SO2 on Hg degrees removal over the 1V-8Ce/AC sorbent. Finally, the mechanism of Hg degrees removal in an SO2 atmosphere was also explored, which showed that Hg degrees was removed by two possible pathways over the 1V-8Ce/AC sorbent.

Automated summary

The experimental results revealed that SO2 has a dual effect on Hg removal, acting both as a promoter and an inhibitor. Under specific conditions, HCl was found to significantly promote Hg removal. The 1V-8Ce/AC sorbent exhibited good sulfur resistance and stability under high temperature and high SO2 concentration conditions.