School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, PO Box 16846-13114, Tehran, Iran.
Sci Rep. 2023 Jun 6;13(1):9214. doi: 10.1038/s41598-023-36434-4.
In this work, benzene based hypercrosslinked polymer (HCP) as an adsorbent was modified using amine group to enhance CO uptake capability and selectivity. Based on BET analysis result, the HCP and the modified HCP provide surface area of 806 (m g) and micropore volume of 453 (m g) and 0.19 (cm g) and 0.14 (cm g), respectively. The CO and N gases adsorption were performed in a laboratory scale reactor at a temperature between 298 and 328 K and pressure up to 9 bar. The experimental data were evaluated using isotherm, kinetic and thermodynamic models to identify the absorbent behavior. The maximum CO adsorption capacity at 298 K and 9 bar was obtained 301.67 (mg g) for HCP and 414.41 (mg g) for amine modified HCP. The CO adsorption thermodynamic parameters assessment including enthalpy changes, entropy changes, and Gibbs free energy changes at 298 K were resulted - 14.852 (kJ mol), - 0.024 (kJ mol K), - 7.597 (kJ mol) for HCP and - 17.498 (kJ mol), - 0.029(kJ mol K), - 8.9 (kJ mol) for amine functionalized HCP, respectively. Finally, the selectivity of the samples were calculated at a CO/N composition of 15:85 (v/v) and 43% enhancement in adsorption selectivity at 298 K was obtained for amine modified HCP.
在这项工作中，苯系超交联聚合物（HCP）被修饰了胺基，以增强 CO 的吸收能力和选择性。基于 BET 分析结果，HCP 和改性 HCP 分别提供了 806（m²/g）和 453（m³/g）的比表面积和 0.19（cm³/g）和 0.14（cm³/g）的微孔体积。在 298 到 328 K 的温度和高达 9 bar 的压力下，在实验室规模的反应器中进行了 CO 和 N 气体的吸附。使用等温线、动力学和热力学模型评估实验数据，以确定吸收剂的行为。在 298 K 和 9 bar 下，HCP 的最大 CO 吸附容量为 301.67（mg/g），胺改性 HCP 的最大 CO 吸附容量为 414.41（mg/g）。CO 吸附热力学参数评估包括在 298 K 时焓变、熵变和吉布斯自由能变的变化，结果分别为-14.852（kJ/mol）、-0.024（kJ/mol/K）和-7.597（kJ/mol），对于胺功能化 HCP，结果分别为-17.498（kJ/mol）、-0.029（kJ/mol/K）和-8.9（kJ/mol）。最后，在 CO/N 组成比为 15:85（v/v）的情况下计算了样品的选择性，在 298 K 时，胺改性 HCP 的吸附选择性提高了 43%。
