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Gradual Disordering of LTA Zeolite for Continuous Tuning of the Molecular Sieving Effect
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-03-21 00:00:00 , DOI: 10.1021/acs.jpcc.7b00724 Hyeonbin Kim 1 , Hae Sung Cho 2 , Chaehoon Kim 1 , Minkee Choi 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-03-21 00:00:00 , DOI: 10.1021/acs.jpcc.7b00724 Hyeonbin Kim 1 , Hae Sung Cho 2 , Chaehoon Kim 1 , Minkee Choi 1
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The “molecular sieving effect” of zeolites has enabled size-selective adsorption and catalysis. Although a large variety of zeolites have been developed thus far, it is still challenging to find zeolites that can separate molecules such as CO2, N2, CH4, and small organics that have kinetic diameters all closely located in the range of 0.3 to 0.4 nm. Here we demonstrate that controlled collapse or atomic disordering of NaA zeolite can systematically narrow the effective pore size below 0.4 nm and thus “tune” the molecular sieving effect. As the zeolite is gradually disordered, the adsorption amounts for all gas molecules decrease; however, larger molecules show a much faster decrease than that of the smaller ones. Consequently, the adsorption selectivities could be remarkably enhanced for various gas pairs.
中文翻译：
LTA沸石逐渐失序，可连续调节分子筛效应
沸石的“分子筛作用”使尺寸选择吸附和催化成为可能。尽管到目前为止已经开发了多种沸石，但是寻找能够分离诸如CO 2，N 2，CH 4之类的分子的沸石仍然具有挑战性。以及动力学直径都在0.3至0.4 nm范围内的小有机物。在这里，我们证明了NaA沸石的受控塌陷或原子无序可以系统地将有效孔径缩小至0.4 nm以下，从而“调节”分子筛作用。随着沸石逐渐无序化，所有气体分子的吸附量降低；反之，则降低。但是，大分子的下降速度要比小分子快得多。因此，对于各种气体对，吸附选择性可以显着提高。
更新日期：2017-03-21
中文翻译：
LTA沸石逐渐失序，可连续调节分子筛效应
沸石的“分子筛作用”使尺寸选择吸附和催化成为可能。尽管到目前为止已经开发了多种沸石，但是寻找能够分离诸如CO 2，N 2，CH 4之类的分子的沸石仍然具有挑战性。以及动力学直径都在0.3至0.4 nm范围内的小有机物。在这里，我们证明了NaA沸石的受控塌陷或原子无序可以系统地将有效孔径缩小至0.4 nm以下，从而“调节”分子筛作用。随着沸石逐渐无序化，所有气体分子的吸附量降低；反之，则降低。但是，大分子的下降速度要比小分子快得多。因此，对于各种气体对，吸附选择性可以显着提高。
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