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Science 9 June 2006:
Vol. 312. no. 5779, p. 1437
DOI: 10.1126/science.312.5779.1437g
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This Week in Science
The potential usefulness of high-temperature solid oxide fuel cells that can run on hydrocarbon fuels is limited by the sensitivity of their nickel-based anodes to sulfur impurities. One way to combat sulfur poisoning is to convert the fuel to reformate (CO and H2) and then remove hydrogen sulfide (H2S) with a sorbent, but sorbents have proven difficult to regenerate in high-temperature operation. Flytzani-Stephanopoulos et al. (p. 1508; see the news story by Service) demonstrate reversible adsorption of H2S on cerium and lanthanum oxide surfaces at temperatures as high as 800°C. The sorbent would be cycled between scrubbing incoming reformate of H2S and using the spent fuel to desorb the sulfur and regenerate a fresh surface. The flow rates can be high enough to reduce contact times to the millisecond range while still reducing H2S to levels below 1 part per million.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
