准开放Cu(Ⅰ)位点用于高效吸附分离CO  

Quasi-open Cu(Ⅰ)sites for efficient adsorptive separation of CO

作　　者：张学文 王超 张杰鹏[1] 陈小明[1] Xuewen Zhang;Chao Wang;Jiepeng Zhang;Xiaoming Chen(School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]中山大学化学学院,广州510275

出　　处：《中国科学：化学》2024年第9期1391-1398,共8页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:222231012,22090061,21821003)资助项目。

摘　　要：当前CO分离技术主要依靠化学吸附/吸收,但存在难脱附和活性位点稳定性差的问题.与传统的开放金属位点不同,准开放金属位点可以利用选择性的结构转变屏蔽非目标客体,同时降低目标客体的脱附难度.晶态吸附剂的结构转变通常被理解为协同性/周期性行为,理论上无法吸附低浓度目标客体(泄露问题),不利于脱除和纯化.实际上,即使是晶体到晶体的结构转变也存在少量的非周期性,转变压力低到一定程度就有可能利用少量非周期性结构转变解决泄漏问题.根据实际需求,可以调整结构转变的协同性/周期性或将具有典型周期性和非周期性柔性行为的吸附剂串联合作以实现最优分离效果.Current CO separation technologies primarily rely on chemical adsorption/absorption,which face challenges such as difficult desorption and poor stability of active sites.In contrast with conventional open metal sites,quasi-open metal sites can utilize selective structural transformations to shield non-target guests and to reduce the difficulty of desorbing target guests.The structural transformation of crystalline adsorbents is generally understood as a cooperative/periodic behavior,which in principle cannot adsorb low-concentration target guests(leakage issues)and is not conducive to removal and purification purposes.Actually,even for crystal-to-crystal structural transformations,there is a small degree of aperiodicity.When the transformation pressure is sufficiently low,minor aperiodicity may be able to solve the leakage problem.According to practical demands,optimal separation performances may be achieved by proper tuning the cooperativity/periodicity of structural transformations or cooperation of adsorbents with typical periodic and aperiodic flexible behaviors.

关 键 词：多孔配位聚合物 框架柔性 准开放金属位点 纯化 稳定性 

分 类 号：O647.3[理学—物理化学] X701[理学—化学]