Kinetic study of SO2 removal over lignin -based activated carbon
Kinetic study of SO2 removal over lignin -based activated carbon
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DOI：
10.1016/j.cej.2016.08.111
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发表时间：
2017-01-01
影响因子：
15.1
通讯作者：
Cordero, Tomas
中科院分区：
文献类型：
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作者：
Rosas, Juana M.;Ruiz-Rosas, Ramiro;Cordero, Tomas
用氯化锌活化木质素制得活性炭，在实验室柱上研究了其对SO2的吸附性能。由于SO2表面氧化成SO 3和随后水合成H2SO 4，入口流中氧气和水蒸气的存在增加了碳的SO2吸附能力。在150-300摄氏度范围内的温度下，化学吸附的SO2的解吸产生碳气化，形成氧表面基团，其在较高温度（>-500摄氏度）下主要分解为CO。入口气体中CO2的存在降低了碳的SO2吸附能力。然而，NO的存在下，不产生任何显着的变化，在SO2的吸附，在所研究的条件。通过一个严格的数学模型充分预测了SO2吸附的穿透曲线，该模型考虑了由Eley-Rideal机理催化氧化SO2以及吸附的SO 3和水蒸气之间的反应以产生H2SO 4，然后由释放活性位点的吸附的H2SO 4的洗脱。(C)2016爱思唯尔B. V.保留所有权利。
Adsorption of SO2 on an activated carbon obtained by chemical activation of (craft lignin with zinc chloride was studied in a laboratory column. The presence of oxygen and water vapor in the inlet stream increases the SO2 adsorption capacity of the carbon, due to the surface oxidation of the SO2 to SO3 and the subsequent hydration to H2SO4. Desorption of the SO2 chemisorbed at temperatures in the range of 150-300 degrees C produces carbon gasification, forming oxygen surface groups that decompose mainly as CO at higher temperatures (>-500 degrees C). The presence of CO2 in the inlet gas decreases the SO2 adsorption capacity of the carbon. However, the presence of NO does not produce any significant change in the adsorption of SO2, at the studied conditions. The breakthrough curves of the SO2 adsorption are predicted adequately by a rigorous mathematical model that takes into account the catalytic oxidation of SO2 by an Eley-Rideal mechanism and the reaction between adsorbed SO3 and water vapor to produce H2SO4, followed by the elution of the adsorbed H2SO4 that releases the active sites. (C) 2016 Elsevier B.V. All rights reserved.