Hydrogen Isotope (H2 and D2) Sorption Study of CHA-Type Zeolites
Hydrogen Isotope (H2 and D2) Sorption Study of CHA-Type Zeolites
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DOI：
10.1080/15361055.2020.1711853
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发表时间：
2020-02
影响因子：
0.9
通讯作者：
A. Taguchi;Takumi Nakamori;Y. Yoneyama;T. Sugiyama;Masahiro Tanaka;K. Kotoh;Y. Tachibana;Tatsuya Suzuki
中科院分区：
文献类型：
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作者：
A. Taguchi;Takumi Nakamori;Y. Yoneyama;T. Sugiyama;Masahiro Tanaka;K. Kotoh;Y. Tachibana;Tatsuya Suzuki
在77、201和250 K条件下，分别用H2和D2或H2-D2混合气体，研究了CHA型沸石离子交换对K、Na和Ca的吸附能力。LTA （Linde A型）（3A）和FAU （faujasite）型沸石也进行了比较。这些材料的孔径按FAU > Ca-CHA > [K-CHA, Na-CHA， LTA(3A)]的顺序递减。D2吸附量大于H2吸附量。在较高温度下，孔径较小的cha型沸石比LTA（3A）和FAU具有更好的D2/H2选择性，表明沸石的氢同位素分离受孔径大小的影响。
Abstract Using either single H2 and D2 or H2-D2 mixed gases, the sorption abilities of CHA (chabazite)-type zeolites ion-exchanged with K, Na, or Ca were studied at 77, 201, and 250 K. The LTA (Linde Type A) (3A) and FAU (faujasite)-type zeolites were also examined for comparison. The pore diameters in these materials were found to decrease on the order of FAU > Ca-CHA > [K-CHA, Na-CHA, and LTA(3A)]. The quantities of D2 adsorbed on these zeolites were larger than the amounts of H2. At higher temperatures, the CHA-type zeolites having smaller pores exhibited superior D2/H2 selectivity compared with the LTA(3A) and FAU, suggesting that hydrogen isotope separation using zeolites is affected by pore size.