Regeneration Mechanism of Sulfur Absorption Via Samarium-doped Cerium Adsorbents in the Gas Atmosphere of O/N.

Sulfides existing in many high-temperature gas mixtures have a negative effect on various industrial applications. Ce-based adsorbents are becoming a hotspot in the high-temperature desulfurization process owing to their excellent thermal stability at high temperatures and regeneration capacity. In this study, we investigate the regeneration path of samarium-doped cerium (SDC) sorbent at high temperature. The SDC adsorbent showed a good sulfur removal ability and excellent regeneration capacity. CeOS and Ce(SO) are observed in the used adsorbent, and CeOS is the main sulfur-containing species. The regeneration path of the CeOS is the key to the regeneration mechanism of the adsorbent. There are two regeneration paths for the CeOS at high temperature in O/N gas mixture. In air stream, the CeOS is oxidized to CeOSO and then decomposes into CeO and SO. In a 2% O/N gas condition, the CeOS directly generates CeO and elemental sulfur with O assistance.