Calorimetric study of the CO2 gate sorption of elastic layer-structured metal-organic frameworks (ELM-11 and ELM-12)
Calorimetric study of the CO2 gate sorption of elastic layer-structured metal-organic frameworks (ELM-11 and ELM-12)
复制标题
弹性层结构金属有机框架（ELM-11 和 ELM-12）CO2 门吸附的量热研究
DOI：
10.1016/j.colsurfa.2022.129745
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Kanoh Hirofumi
中科院分区：
文献类型：
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作者：
Sugiura Hikaru;Kajiro Hiroshi;Kanoh Hirofumi
弹性层结构金属有机骨架(ELM)具有柔性结构。ELM-11在CO2吸附-脱附过程中表现为栅极现象，ELM-12在77℃时表现为N2的两步吸附，但ELM-12对CO2的吸附尚未得到详细的研究。通过量热测量吸附和解吸热，可以分析吸附机理和行为。用量热法测定了ELM-11和ELM-12的吸附、脱附热和栅极现象，并与van‘t Hoff和Clausius-Clapeyron方程的结果进行了比较。尽管榆树的层间膨胀使其失稳，但吸附热仍大于CO2液化。此外，热量与使用van‘t Hoff曲线图估算的热量相似。由于栅极现象导致的对CO2的快速吸收和快速吸附，产生了一种能量有利的过程和比现有吸附剂更有效的热交换，后者表现出适度的吸附速率。因此，ELM-11在气体吸收热管理方面有一定的应用。与ELM-11不同的是，ELM-12在760Torr以下没有表现出门控CO2吸附，而是开放的微孔被填充。此外，吸附热高于CO2的升华热。
Elastic layer-structured metal–organic frameworks (ELMs) have flexible structures. ELM-11 shows the gate phenomenon on CO2sorption–desorption, and ELM-12 shows the double-step sorption of N2at 77 K, but the CO2sorption of ELM-12 has not been investigated in detail. Calorimetric measurements of the heats of sorption and desorption enable analysis of the sorption mechanism and behavior. The heats of sorption, desorption, and the gate phenomenon for ELM-11 and -12 were obtained calorimetrically and compared with those obtained using the van 't Hoff and Clausius–Clapeyron equations. The sorption heat was greater than that of CO2liquefaction, despite the destabilization of the ELM resulting from interlayer expansion. Further, the heat was similar to that evaluated using van 't Hoff plots. The rapid uptake and fast rate of CO2sorption resulting from the gate phenomenon yielded an energetically favorable process and more effective heat exchange than those of existing adsorbents, which show modest adsorption rates. Therefore, ELM-11 has applications in heat management for gas sorption. Unlike ELM-11, ELM-12 did not show gated CO2sorption below 760 Torr but, instead, the open micropores were filled. In addition, the heat of adsorption was higher than that of the sublimation of CO2.