Activated carbons as adsorbents of sulfur dioxide in flowing air. Effect of their pore texture and surface basicity
Activated carbons as adsorbents of sulfur dioxide in flowing air. Effect of their pore texture and surface basicity
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DOI：
10.1021/la00029a035
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发表时间：
1993-05
期刊：
影响因子：
3.9
通讯作者：
C. Moreno-Castilla;F. Carrasco-Marín;E. Utrera-Hidalgo;J. Rivera-Utrilla
中科院分区：
文献类型：
--
作者：
C. Moreno-Castilla;F. Carrasco-Marín;E. Utrera-Hidalgo;J. Rivera-Utrilla
K，并在热重分析仪中进行。在673 K下在N2流中解吸之后，获得第一和随后的吸附循环的SO2吸附容量和吸附过程的最大速率。这些参数与活性炭的孔结构和它们的总表面碱度相关，如通过HCl滴定所测量的。因此，SO2吸附容量和最大吸附速率取决于苯或正己烷可接近的体积。从第一个吸附循环到随后的吸附循环，SO2吸附容量降低，吸附速率增加，这被解释为由于未解吸的SO2分子堵塞了较窄的微孔。最后，总表面碱度的增加增加了SO2吸附能力，尽管足够的微孔性是所用样品中最具影响力的参数。
K and was followed in a thermogravimetric analyzer. The S02 adsorption capacity and the maximum rate of the adsorption process were obtained for the first and subsequent adsorption cycles, after desorption at 673 K in a N2 flow. These parameters were correlated with the pore texture of the activated carbons and with their total surface basicity as measured by HC1 titration. Thus, the S02 adsorption capacity and the maximum adsorption rate depend on the micropore volume accessible to either benzene or n-hexane. The S02 adsorption capacity decreases andthe adsorption rate increases from the first to the subsequent adsorption cycles, which was interpreted as due to a blockage of the narrower micropores by the S02 molecules not desorbed. Finally, an increase in the total surface basicity increases the S02 adsorption capacity, although an adequate microporosity was the most influential parameter in the samples used.