A kind of commercial sulfur-loaded activated carbon (SAC) was experimentally studied on the mercury adsorption and adsorbent regeneration performance. Mercury adsorption experiments were carried out on a bench-scale fixed-bed experimental device. The physicochemical properties of the original and used SAC were characterized and discussed on the basis of the surface area and porosity (Brunauer–Emmett–Teller measurements) and X-ray photoelectron spectroscopy analysis. The results showed that the specific surface areas and the content of oxygen functional groups as well as non-oxidized sulfur on the surface decreased after mercury adsorption. The used samples were regenerated via the co-pyrolysis with elemental sulfur. The regenerated adsorbent showed an average mercury removal efficiency up to 95% in 2 h under the conditions of the co-pyrolysis temperature at 600 °C, 1 h heating time, and sulfur–carbon ratio of 1:1. The regenerated sample was found to be structurally stable and sustainably reactive on the Hg⁰ capture within 5 cycles. The mercury adsorption capacity still maintained 291.22 μg/g after 5 cycles. SAC with the adsorbent regeneration method will provide a database for developing the renewable mercury adsorbent applied in the injecting demercuration technology in flue gas of coal-fired power plants.

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硫载活性炭对汞的吸附和吸附剂再生的实验研究

通过实验研究了一种商业化的载硫活性炭（SAC）对汞的吸附和吸附剂的再生性能。在台式规模的固定床实验装置上进行了汞吸附实验。在表面积和孔隙率（Brunauer-Emmett-Teller测量）和X射线光电子能谱分析的基础上，对原始SAC和使用过的SAC的理化性质进行了表征和讨论。结果表明，吸附汞后，比表面积和氧官能团含量以及表面未氧化硫含量均降低。用过的样品通过与元素硫的共热解进行再生。在共热解温度为600°C，加热时间为1 h，硫碳比为1：1的条件下，再生的吸附剂在2 h内平均除汞效率高达95％。发现再生的样品在结构上稳定且对汞具有可持续的反应性5个周期内捕获⁰个。5个循环后，汞吸附容量仍保持为291.22μg/ g。采用吸附剂再生方法的SAC将为开发可再生汞吸附剂提供数据库，该吸附剂用于燃煤电厂烟气注入脱汞技术。