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Liquid redox sulfur recovery (LRSR) processes using tannin extracts and vanadium pentoxide as dual redox catalysts are widely employed for removal of hydrogen sulfide and recovery of elemental sulfur from coal syngas in China. Difficulties in melting sulfur pastes, poor quality of sulfur and the running stability are the major concern of the process. In this study, tannin extracts obtained from valonia...
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