每周分享:《Journal of the American Chemical Society》上發表文章

時間:2014-05-30    瀏覽:1129次

   今天給大家分享的是2013年5月份《Journal of the American Chemical Society》上發表的一篇名為:Highly Selective Quantum Sieving of D2 from H2 by a Metal–Organic Framework As Determined by Gas Manometry and Infrared Spectroscopy

文章摘要如下:

The quantum sieving effect between D2 and H2 is examined for a series of metal–organic frameworks (MOFs) over the temperature range 77–150 K. Isothermal adsorption measurements demonstrate a consistently larger isosteric heat of adsorption for D2 vs H2, with the largest difference being 1.4 kJ/mol in the case of Ni-MOF-74. This leads to a low-pressure selectivity for this material that increases from 1.5 at 150 K to 5.0 at 77 K. Idealized adsorption solution theory indicates that the selectivity decreases with increasing pressure, but remains well above unity at ambient pressure. Infrared measurements on different MOF materials show a strong correlation between selectivity and the frequency of the adsorbed H2 translational band. This confirms that the separation is predominantly due to the difference in the zero-point energies of the adsorbed isotopologues.

該文章中材料表征采用的是美國麥克儀器ASAP 2020,使用該儀器獲得材料氣體吸附脫附等溫線。

詳情可參考下面鏈接:

http://pubs.acs.org/doi/abs/10.1021/ja402103u