Guo Yangyang, Luo Lei, Zheng Yang, Zhu Tingyu
Beijing Engineering Research Centre of Process Pollution Control, Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Center for Excellent in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
ACS Omega. 2020 Apr 20;5(17):9641-9648. doi: 10.1021/acsomega.9b03374. eCollection 2020 May 5.
For improving the CO adsorption capacity of solid-supported amines, five commercial porous supports have been selected and impregnated with tetraethylenepentamine (TEPA), and their CO adsorption performances have been evaluated using a fixed-bed reactor coupled with mass spectrometry. For solid-supported amines, CO adsorption capacities coincide with the texture characterization of the adsorbent supports (mesoporous alumina, montmorillonite, silica gel, porous resin, MCM-41 molecular sieve), and the optimum TEPA loading amount is mainly affected by the pore volume. The mesoporous supports were found to be more conducive to uniform loading of organic amine, with more than 370 mg/g CO adsorbed per unit TEPA. Other components in flue gas, especially HO, favor CO adsorption on solid-supported amines. SO inhibited the CO adsorption, which was mainly attributable to the strong and irreversible binding of SO on some amine sites. NO had little effect on CO adsorption. Thermal stabilities of solid-supported amines have been tested based on thermogravimetry curves, and the main weight loss peak for TEPA appears at 513 K for solid-supported amines. Linear and step regeneration modes have been compared, revealing that the temperature for step regeneration is 37 K lower than that for the linear regeneration mode. Moreover, the desorption peak area for the step regeneration mode is 20% higher than that for the linear regeneration mode, indicating that the step regeneration mode can be used in practical applications, to reduce energy consumption during regeneration.
为提高固体负载胺的CO吸附容量，选择了五种商用多孔载体并用四乙烯五胺（TEPA）进行浸渍，采用固定床反应器结合质谱法对其CO吸附性能进行了评估。对于固体负载胺，CO吸附容量与吸附剂载体（介孔氧化铝、蒙脱石、硅胶、多孔树脂、MCM-41分子筛）的织构特征相符，最佳TEPA负载量主要受孔体积影响。发现介孔载体更有利于有机胺的均匀负载，每单位TEPA吸附的CO超过370 mg/g。烟气中的其他成分，尤其是HO，有利于CO在固体负载胺上的吸附。SO抑制了CO吸附，这主要归因于SO在某些胺位点上的强烈且不可逆的结合。NO对CO吸附影响不大。基于热重曲线测试了固体负载胺的热稳定性，对于固体负载胺，TEPA的主要失重峰出现在513 K。比较了线性和阶梯式再生模式，结果表明阶梯式再生的温度比线性再生模式低37 K。此外，阶梯式再生模式的解吸峰面积比线性再生模式高20%，表明阶梯式再生模式可用于实际应用，以降低再生过程中的能耗。
