Abstract Recent, carbon-based adsorption technology, especially activated carbon with element-doping treatment, has been considered an effective approach to capture elemental mercury (Hg0) from coal-fired flue gas. In this study, a novel sulfur-rich activated carbon (S/AC) was in-situ derived from coal liquefaction residue (CLR) with KOH activation, which can make full use of the sulfur in CLR and simplify the preparation process. The effects of KOH to CLR weight ratios and activation temperatures on Hg0 removal performance were discussed. The S/AC was characterized by N2 adsorption/desorption, XRD, SEM, TEM-EDS, XPS and Hg-TPD techniques. A fixed-bed reactor was used to estimate the Hg0 removal performance of sorbents. The effects of adsorption temperatures and flue gas components on Hg0 removal performance were also evaluated. The sorbent exhibited excellent Hg0 removal performance with the KOH to CLR weight ratio of 1:2 and the activation temperature of 800 °C. The Hg0 removal efficiency was stabilized at 97% at 60–120 °C with a gas hourly space velocity (GHSV) of 7.5 × 104 h−1. Both SO2 and NO exhibited positive influences on S/AC sorbents for Hg0 capture. The XPS and Hg-TPD results indicated that sulfur is primary active site for Hg0 removal, and the mercury adsorbed on S/AC sorbent was HgS. The research indicated that CLR is a potential raw material for synthesizing high efficient S/AC sorbents for Hg0 removal from flue gas.

中文翻译：

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将煤液化残渣升级为富硫活性炭以有效去除燃煤烟气中的 Hg0

摘要 近年来，基于碳的吸附技术，尤其是经过元素掺杂处理的活性炭，被认为是从燃煤烟气中捕获元素汞（Hg0）的有效方法。本研究以煤液化渣油（CLR）为原料，通过KOH活化原位制备了一种新型富硫活性炭（S/AC），可充分利用CLR中的硫，简化制备工艺。讨论了 KOH 与 CLR 重量比和活化温度对 Hg0 去除性能的影响。S/AC 通过 N2 吸附/解吸、XRD、SEM、TEM-EDS、XPS 和 Hg-TPD 技术进行表征。固定床反应器用于评估吸附剂的 Hg0 去除性能。还评估了吸附温度和烟气成分对 Hg0 去除性能的影响。该吸附剂表现出优异的 Hg0 去除性能，KOH 与 CLR 的重量比为 1:2，活化温度为 800 °C。Hg0 去除效率在 60-120°C 下稳定在 97%，气时空速 (GHSV) 为 7.5 × 104 h-1。SO2 和 NO 都对用于 Hg0 捕获的 S/AC 吸附剂产生积极影响。XPS 和 Hg-TPD 结果表明硫是去除 Hg0 的主要活性位点，S/AC 吸附剂上吸附的汞为 HgS。研究表明，CLR 是合成高效 S/AC 吸附剂以去除烟气中 Hg0 的潜在原料。SO2 和 NO 都对用于 Hg0 捕获的 S/AC 吸附剂产生积极影响。XPS 和 Hg-TPD 结果表明硫是去除 Hg0 的主要活性位点，S/AC 吸附剂上吸附的汞为 HgS。研究表明，CLR 是合成高效 S/AC 吸附剂以去除烟气中 Hg0 的潜在原料。SO2 和 NO 都对用于 Hg0 捕获的 S/AC 吸附剂产生积极影响。XPS 和 Hg-TPD 结果表明硫是去除 Hg0 的主要活性位点，S/AC 吸附剂上吸附的汞为 HgS。研究表明，CLR 是合成高效 S/AC 吸附剂以去除烟气中 Hg0 的潜在原料。