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Abstract
The concept of chemical looping is applied for the first time to selective oxidation of H2S to elemental sulfur. An oxygen carrier (OC) is exposed to cyclic reduction by H2S and oxidation by O2. The properties of bulk V2O5 as OC are explored for this reaction in the 150−200 °C temperature range. Steady cyclic behavior can be obtained with high selectivity towards elemental sulfur. Some undesired SO2 is formed during exposure to H2S but more significantly during re-oxidation of the OC. This indicates that bulk V2O5 does not completely oxidize the adsorbed H2S in the reductant step. Characterizations indicate that V4+ and V5+ species are mostly involved in the process. Preferential oxidation in presence of CH4 is confirmed on this OC. Although optimization needs to be done, the potential of chemical looping concept for direct preferential oxidation of H2S in natural gas and biogas is demonstrated.
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