CO₂ Adsorption Sites in UTSA-16: Multitechnique Approach

High Resolution Image Download MS PowerPoint Slide The key role of K + counterions in determining the high CO 2 capacity of UTSA-16 has been highlighted thanks to a combined use of in situ infrared and 13 C 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 CO 2 isosteric heat and by using a less sensitive probe than H 2, as CO and N 2 .