This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer. or otherwise does not necessarily constitute or imply its endorsement, reammendktion, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect thosc of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible electronic image products. Images are produced from the best available original document. ACKNOWLEDGMENT This research is sponsored by the U.S. Department of Energy, Federal Energy Technology Center under contract number DE-AC21-94MC30012. The authors are particularly grateful for the assistance and advice provided by Mr. Thomas Dorchak of FETC. Finally, the sulfates of many of the candidate sorbents may be formed in the SO,-0, atmosphere. S p a b g caused by the formation of the ZnSO, is one of the problems which has delayed the development of zinc-based sorbent processes. An alternate regeneration process in which the sulfur is liberated in elemental form is desired. Elemental sulfur, which is the typical feed to sulfuric acid plants, may be easily separated, stored, and transported. Although research to convert SO, produced during sorbent regeneration to elemental sulfur is ongoing , additional processing steps are required and the overall process will be more complex. Clearly, the direct production of elemental sulfur is preferred. This study began with a literature search to identlfy possible concepts for elemental sulfur production during regeneration and to gather relevant thermodynamic, kinetic, and process data. Following the literature search, a thermodynamic analysis, based on free energy minimization, was canied out to evaluate candidate sorbents for possible use with the regeneration concepts. As a result of this effort, iron-and cerium-based sorbents were selected for the preliminary experimental study. Neither of these materials possesses the high H,S removal capability associated with zinc-based sorbents. However, on the basis of the thermodynamic analysis, both are more likely to produce elemental sulfur during the regeneration phase. The regeneration of FeS has been investigated using the so-called partial oxidation concept in which the regeneration feed gas contains large H,O/Oi ratios. Electrobalance reactor studies were performed initially to obtain comparative kinetics of the FeS-0, and FeS-H,O reactions. This was followed by a series of laboratory-scale fmed-bed reactor tests in wh...