Highly Selective Sorption and Separation of CO2 from a Gas Mixture of CO2 and CH4 at Room Temperature by a Zeolitic Organic鈥揑norganic Ionic Crystal and Investigation o
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- 作者：Ryo Eguchi ; Sayaka Uchida ; Noritaka Mizuno
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：August 2, 2012
- 年：2012
- 卷：116
- 期：30
- 页码：16105-16110
- 全文大小：281K
- 年卷期：v.116,no.30(August 2, 2012)
- ISSN：1932-7455
文摘
Mixed gas cosorption and gas chromatographic investigations demonstrate that a zeolitic organic鈥搃norganic ionic crystal K2[Cr3O(OOCH)6(4-etpy)3]2[伪-SiW12O40]路2H2O [1路2H2O] (etpy = ethylpyridine) with a pore diameter of 3.5 脜 possesses high separation ability of carbon dioxide (kinetic diameter 3.3 脜) over methane (3.76 脜) at room temperature in the presence of water vapor. Monte Carlo simulation combined with density functional theory calculation suggests that carbon dioxide molecules diffuse into the one-dimensional channels and interact initially with the potassium ions and then with the oxygen atoms of silicododecatungstates, which are confirmed with carbon dioxide sorption enthalpy and in situ IR spectroscopy.