Regenerative Adsorption and Removal of H 2 S from Hot Fuel Gas Streams by Rare Earth Oxides
- 9 June 2006
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 312 (5779), 1508-1510
- https://doi.org/10.1126/science.1125684
Abstract
Sorbent materials that allow for high-temperature, regenerative desulfurization of fuel gas streams for the anode of a solid oxide fuel cell have been developed. Reversible adsorption of H 2 S on cerium and lanthanum oxide surfaces is demonstrated over many cycles at temperatures as high as 800°C, on both fresh or presulfided sorbents, and at very high space velocities. The adsorption and desorption processes are very fast, and removal of H 2 S to sub–parts per million levels is achieved at very short (millisecond) contact times. Any type of sulfur-free gas, including water vapor, can be used to regenerate the sorbent surface. Preferably, the anode off-gas stream is used to sweep the desorbed H 2 S to a burner.Keywords
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