Supercritical fluids in mesopores—new insight using NMR |
| |
Authors: | Muslim Dvoyashkin Rustem Valiullin Jörg Kärger |
| |
Institution: | 1. Institut für Physik, Abt. GFP, Universit?t Leipzig, Linnestra?e 5, 04103, Leipzig, Germany
|
| |
Abstract: | Supercritical fluids are an essential constitute of modern chemical industry. However, their optimal use in processes involving
porous solids is rather limited due to our poor knowledge about their transport properties under confinements. By using the
non-invasive pulsed field gradient NMR method, we directly assessed molecular diffusivities of n-pentane in mesopores at sub-
and supercritical temperatures. The obtained results ultimately point out that criticality in pores occurs at lower temperatures
than in the bulk liquid surrounding the porous solid. The data on molecular diffusivities and pore density may be self-consistently
quantified using simple gas-kinetic arguments. |
| |
Keywords: | Supercritical state Mesopores Diffusion NMR |
本文献已被 SpringerLink 等数据库收录! |
|