Steam regenerative removal of hydrogen sulfide from hot syngas by a novel tin oxide and yttrium oxide sorbent

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Energy, ISSN: 0360-5442, Vol: 122, Page: 214-220

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Yi Yang, Yixiang Shi, Ningsheng Cai
Elsevier BV
Environmental Science, Energy
article description
A novel HS sorbent based on SnOand YOis developed by a co-precipitation method for steam regenerative removal of HS from hot syngas at moderate temperatures (400–500 °C). SnO-YOsorbent is stable in a reducing atmosphere (i.e. 500 °C, 50% H) and achieves a 99.9% HS removal during successive desulfurization and regeneration cycles. The addition of yttrium to SnOdecreases the reduction property of SnOand no metallic Sn exists in the reducing atmosphere due to the formation of a pyrochlore-type compound, YSnO. The SnO-YOsorbent has a desulfurization performance deterioration with the increasing calcination temperature. The newly developed SnO-YOsorbent can be regenerated by steam at 500 °C. In the eight successive desulfurization and regeneration cycles, SnO-YOsorbent has a cyclic breakthrough sulfur capacity of 9 mg/g without significant sulfur capacity loss.

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