This study evaluated the mercury sorption by activated carbon (AC) under an O₂/CO₂ atmosphere in a fixed-bed reactor. Effects of the oxygen concentration on the mercury sorption efficiency under both air and oxy-fuel atmospheres were explored. The kinetic studies were also used to predict the mercury sorption process by the pseudo-first-order model and the intraparticle diffusion model in this work. The experimental results indicated that the mercury sorption capacity of AC increased with the increased oxygen concentration under both air and oxy-fuel atmospheres. Oxygen might increase the oxidation of mercury by the Mars–Maessen way. A high CO₂ concentration promoted AC to generate more active sites under an oxy-fuel atmosphere. Besides, the results of the kinetic analysis illustrated that the pseudo-first-order model showed better agreement with the experimental data compared to the intraparticle diffusion model. These experimental and theoretical results in this work are helpful in mercury capture under an oxy-fuel atmosphere.

中文翻译：

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在O ₂ / CO ₂燃烧条件下捕获烟气中汞的活性炭。第1部分：实验和动力学研究

这项研究评估了在固定床反应器中O ₂ / CO ₂气氛下活性炭（AC）对汞的吸附。探索了氧气浓度对空气和含氧燃料气氛下汞吸附效率的影响。在这项工作中，动力学研究还被用来通过伪一级模型和颗粒内扩散模型预测汞的吸附过程。实验结果表明，在空气和含氧燃料气氛下，AC的汞吸附能力都随着氧浓度的增加而增加。氧气可能会通过Mars-Maessen方法增加汞的氧化。高CO ₂浓度促进了AC在氧气-燃料气氛下产生更多的活性位点。此外，动力学分析的结果表明，与颗粒内扩散模型相比，拟一级模型与实验数据具有更好的一致性。这项工作中的这些实验和理论结果有助于在含氧燃料气氛下捕集汞。