Warm gas cleanup of fuel gas from integrated gasification combined cycle power plants is important to preserve both their higher thermal efficiencies, and to eliminate dirty water circulation and treatment systems. Eleven pilot-scale tests of palladium on alumina sorbents for the removal of trace contaminants from several types of coal-derived syngas at elevated temperatures and pressures were conducted at the Southern Company National Carbon Capture Center. Between 96 - 100% removal of mercury, arsenic, and selenium from all syngas types, sour and sweet, was observed at 500 °F and elevated pressures of 150 - 200 psig. The results indicate that the Pd sorbents exhibit large capacities for the capture of Hg, Se, and As under varying conditions and over extended test periods of up to forty nine days. Current preliminary work also shows that the sorbent is not only regenerable, but that the sorbent is just as effective at capturing these contaminants after regeneration. Future work and tests will focus on use of lower loadings of Pd, higher syngas flow rates, and further regeneration cycles in the removal of the trace contaminants, as well as the possible removal of other contaminants.
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