School of Chemical Engineering, College of Engineering, Hanyang University, Seoul, Republic of Korea.
Phys Chem Chem Phys. 2012 Apr 7;14(13):4365-73. doi: 10.1039/c2cp23729f. Epub 2012 Jan 23.
Microporous materials have a great importance in catalysis, delivery, storage and separation in terms of their performance and efficiency. Most microporous materials are comprised of inorganic frameworks, while thermally rearranged (TR) polymers are a microporous organic polymer which is tuned to optimize the cavity sizes and distribution for difficult separation applications. The sub-nano sized microcavities are controlled by in situ thermal treatment conditions which have been investigated by positron annihilation lifetime spectroscopy (PALS). The size and relative number of cavities increased from room temperature to 230 °C resulting in improvements in both permeabilities and selectivities for H(2)/CO(2) separation due to the significant increase of gas diffusion and decrease of CO(2) solubility. The highest performance of the well-tuned TR-polymer membrane was 206 Barrer for H(2) permeability and 6.2 of H(2)/CO(2) selectivity, exceeding the polymeric upper bound for gas separation membranes.
微孔材料在催化、输送、储存和分离方面具有重要意义，其性能和效率都很高。大多数微孔材料由无机骨架组成，而热重排（TR）聚合物是一种微孔有机聚合物，可以对其进行调谐以优化空腔大小和分布，从而满足困难的分离应用需求。亚纳米级微腔由原位热处理条件控制，已通过正电子湮没寿命谱（PALS）进行了研究。空腔的尺寸和相对数量从室温增加到 230°C，由于气体扩散的显著增加和 CO2 溶解度的降低，导致 H(2)/CO(2)分离的渗透性和选择性都得到了提高。经过精心调谐的 TR-聚合物膜的最佳性能为 H(2)渗透性 206 巴雷尔，H(2)/CO(2)选择性为 6.2，超过了气体分离膜的聚合物上限。
