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首页> 外文期刊>Journal of Chemical and Engineering Data: the ACS Journal for Data >Net, Excess, and Absolute Adsorption of N2, CH4, and CO2 on Metal–Organic Frameworks of ZIF-8, MIL-101(Cr), and UiO-66 at 282–361 K and up to 12 MPa
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Net, Excess, and Absolute Adsorption of N2, CH4, and CO2 on Metal–Organic Frameworks of ZIF-8, MIL-101(Cr), and UiO-66 at 282–361 K and up to 12 MPa

机译：在ZIF-8，MIL-101（Cr）和UIO-66的金属 - 有机框架上的N2，CH4和CO2的净，过量和绝对吸附于282-361k，高达12MPa

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摘要

Experimental gas adsorption data on particular porous solids, reported in the literature, typically disagree within large scales. Besides, the literature data are generally hard to be reproduced within stated uncertainties, and sometimes no uncertainty information is provided. Therefore, in an effort toward standardization of adsorption measurements, this work offers high-quality N_(2), CH_(4), and CO_(2) adsorption data on three metal-organic frameworks (MOFs) of ZIF-8, MIL-101(Cr), and UiO-66 with detailed traceable uncertainty information. The adsorption capacity of gases was measured with a gravimetric sorption analyzer, incorporated with a magnetic-suspension balance, over the temperature range of 282–361 K and pressure up to 12 MPa. The high-pressure adsorption data enabled us to study the micro- and mesoporosities of the adsorbents in more detail. The relative combined expanded uncertainty (k = 2) of the measured absolute adsorption capacity is in the order of 40 and 2% at the lowest and highest pressures, respectively. The measurement results show that MIL-101(Cr) has the highest adsorption capacity for all the three gases, followed by UiO-66 and ZIF-8; and all three MOFs, particularly UiO-66, present a reasonable selectivity for CO_(2) over CH_(4) and N_(2) and have the potential to be utilized in the separation of CO_(2) from these gas mixtures.
机译：文献中报道的特定多孔固体上的气体吸附实验数据在大范围内通常不一致。此外，文献数据通常很难在规定的不确定度范围内重现，有时不提供不确定度信息。因此，为了实现吸附测量的标准化，这项工作提供了ZIF-8、MIL-101（Cr）和UiO-66三种金属有机框架（MOF）上的高质量N_2、CH_4和CO_2吸附数据，以及详细的可追踪不确定度信息。在282–361 K的温度范围内，在12 MPa的压力下，使用重量吸附分析仪和磁悬液天平测量气体的吸附容量。高压吸附数据使我们能够更详细地研究吸附剂的微孔和中孔。在最低和最高压力下，测得的绝对吸附容量的相对组合扩展不确定度（k=2）分别为40%和2%。测量结果表明，MIL-101（Cr）对三种气体的吸附能力最高，其次是UiO-66和ZIF-8；所有三种MOF，尤其是UiO-66，对CO_2的选择性都高于CH_4和N_2，并且有可能用于从这些气体混合物中分离CO_2。

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