O2 Adsorption on ZIF-8: Temperature Dependence of the Gate-Opening Transition

被引：35

作者：

Russell, Brice ^{[1
]}

Villaroel, Jhonny ^{[2
]}

Sapag, Karim ^{[2
]}

Migone, Aldo D. ^{[1
]}

机构：

[1] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

[2] CONICET Univ Nacl San Luis, Inst Fis Aplicada, RA-5700 San Luis, Argentina

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 49期

关键词：

METAL-ORGANIC FRAMEWORKS; GASES; FLEXIBILITY; CO2; CH4;

D O I：

10.1021/jp508382v

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present the results of an adsorption isotherm study of O-2 on the metalorganic framework ZIF-8. This material undergoes a structural transition (gate-opening) as a function of increasing pressure and sorbent loading, which manifests itself in the isotherm data as a quasi-vertical substep. We used this feature to explore the temperature dependence of the structural transition; we have found that the transition occurs below the saturated vapor pressure only for temperatures below 95.39 K. The adsorption isotherm data measured at various temperatures were used also to determine the isosteric heat of adsorption of O-2 on this sorbent for different sorbent loading values. We have studied the adsorption kinetics for this system, that is, how the equilibration times for adsorption change as a function of sorbent loading. The sorbent loading dependence of the equilibration time is nonmonotonic; this characteristic appears to be related to the structural transition in the sorbent.

引用

页码：28603 / 28608

页数：6

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