CO2 Adsorption Sites in UTSA-16: Multitechnique Approach

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• 作者：Alessio Masala ; Francesca Grifasi ; Cesare Atzori ; Jenny G. Vitillo ; Lorenzo Mino ; Francesca Bonino ; Michele R. Chierotti ; Silvia Bordiga
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：120
• 期：22
• 页码：12068-12074
• 全文大小：409K
• 年卷期：0
• ISSN：1932-7455

文摘

The key role of K⁺ counterions in determining the high CO₂ capacity of UTSA-16 has been highlighted thanks to a combined use of in situ infrared and ¹³C solid-state NMR spectroscopies performed in a controlled atmosphere at variable temperature and pressure. A second family of sites, engaged at higher temperature or at higher coverage, was identified in the organic linker. Variable temperature IR measurements of molecular hydrogen at 15 K allowed to further distinguish the K⁺ sites in two families, slightly different in their polarizing ability and indistinguishable on the basis of CO₂ isosteric heat and by using a less sensitive probe than H₂, as CO and N₂.