Hu Xuechao, Dong Junhui
School of Materials Science and Engineering, Inner Mongolia University of Technology, Aimin Street 49, Hohhot 010051, China.
Inner Mongolia Power Research Institute, Hohhot 010020, China.
Materials (Basel). 2020 Mar 9;13(5):1225. doi: 10.3390/ma13051225.
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.
存在于许多高温气体混合物中的硫化物对各种工业应用有负面影响。基于铈的吸附剂由于其在高温下优异的热稳定性和再生能力，正成为高温脱硫过程中的一个热点。在本研究中，我们研究了钐掺杂铈（SDC）吸附剂在高温下的再生路径。SDC吸附剂表现出良好的脱硫能力和优异的再生能力。在使用过的吸附剂中观察到CeOS和Ce(SO)，且CeOS是主要的含硫物种。CeOS的再生路径是吸附剂再生机理的关键。在O/N气体混合物中，CeOS在高温下有两条再生路径。在空气流中，CeOS被氧化为CeOSO，然后分解为CeO和SO。在2% O/N气体条件下，CeOS在O的辅助下直接生成CeO和元素硫。
