Manganese-based regenerable sorbents for high temperature H₂S removal
2013
Wang, Ju | Liang, Bin | Parnas, Richard
A series of sorbents with different manganese contents have been prepared by co-precipitation method for 850°C regenerative H₂S removal. The sulfur capacity increased linearly with the increase of manganese content. The performance of sorbents prepared by co-precipitation of Mn nitrate and Al nitrate appears to be stable over five sulfidation–regeneration cycles. Al₂O₃ plays an important role in the performance of sorbents and the recovery of elemental sulfur in O₂ regeneration. With increasing Mn content in the sorbent, increasing O₂ concentration in the regeneration gas or increasing total regeneration gas flow rate, the recovery of elemental sulfur decreased. Elemental sulfur is the only product with SO₂ regeneration. The sorbents cannot be completely regenerated with SO₂ under the conditions used. The sorbents, however, can be completely regenerated by steam. The main product for steam regeneration is H₂S. Steam regeneration results in less sintering than O₂ regeneration.
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