改性5A分子筛化学吸附低浓度SO_2

Chemisorption of low-concentration SO_2 on modified 5A-zeolite-supported triethanolamine

针对密闭空间低浓度二氧化硫气体危害人体健康的问题,本文采用将三乙醇胺负载于改性的5A分子筛制成吸附剂的方法,以去除低浓度有害SO_2气体。通过固定床反应器检测硫化物的吸附容量,采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶红外光谱仪(FTIR)、X-射线光电子能谱仪(XPS)等表征吸附剂的性能。实验结果表明:SO_2的吸附量主要受三乙醇胺的吸附量与反应温度的影响。TEA/MZs-100-20吸附剂对低浓度SO_2气体显示出优异的吸附性能:在20℃下,三乙醇胺负载量为100wt%时,其穿透实验时间达到205 min,饱和吸附量达到91.41 mg/g。通过傅里叶红外光谱及XPS分析,证实了去除低浓度SO_2的吸附反应机理。

To solve the problem of the presence of low-concentration sulfur dioxide gas in a confined space,which can endanger human health,in this paper,we introduce a method for preparing triethanolamine（TEA）-loaded adsorbents by modified 5 A zeolite to remove the noxious low-concentration SO2. We tested the sulfide adsorption capacities on a fixed bed reactor and characterized other properties by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,Fourier transformed infrared（FTIR）,and X-ray photoelectron spectroscopy（XPS）. Our experimental results show that the SO2 sorption property is influenced significantly by the triethanolamine（TEA）loading ratio and reaction temperature. The TEA/MZs-100-20 absorbent shows a superior ability to remove low-concentration SO2 from a gas stream. At 20℃ and a loading of 100 wt%,the TEA penetration experiment took 205 min,and its saturated adsorption reached 91. 41 mg/g. We verified the reaction mechanisms of the adsorbent removing the low-concentration SO2 by FTIR and XPS.