文章基本信息

标题：Insights into the Effect of Adsorption–Desorption Cycles on SO2 Removal over an Activated Carbon
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作者：Shaojun Liu ; Xinning Yu ; Guoxin Lin 等
期刊名称：Aerosol and Air Quality Research
印刷版ISSN：1680-8584
出版年度：2019
卷号：19
期号：2
页码：411-421
DOI：10.4209/aaqr.2018.07.0269
语种：English
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：The use of an activated carbon (AC) with high ash content (15.92%) for SO2 removal was investigated during adsorption-desorption cycles. Significant deterioration in both dynamic and equilibria adsorption processes during the cycles was observed. To investigate the causes of deactivation, SO2 temperature-programmed desorption (SO2-TPD) experiments were conducted. The results indicated that most of the stored sulfur-containing species were released in the form of SO2 when the temperature was below 400°C. In addition to SO2, traces of CO were detected, but higher temperatures were required for the abundant release of CO. A Fourier-transform infrared spectrometry (FTIR) experiment was used to investigate changes in the oxygen-containing groups, and the results confirmed the formation of stable C-O complexes. These formations were tentatively attributed to the CO precursor’s occupation of active sites. Based on the formation of C-O complexes, two deactivation pathways in the cycles were proposed. The adsorption-desorption cycles also affected the AC ash. The formation of sulfur-containing species in the ash was confirmed through thermodynamic calculation and powder X-ray diffraction.
关键词：Activated carbon;Adsorption;Desorption;SO2 removal