Abstract
In this work, a liquid-liquid exchange (LLE) process within nanoporous heterogeneous catalysts has been followed using NMR relaxometry. Under so-called 'metered' supply conditions, when a high affinity liquid (water) displaced a low affinity liquid (cyclohexane) from a nanoporous sol-gel silica, entrapment of the low affinity liquid was observed which was similar to that observed in mercury porosimetry. In a similar experiment, comparing LLE in fresh and coked samples of bimodal Pt-alumina catalyst pellets, it was found that, while for the fresh sample water initially displaced cyclohexane from the smallest pores, as expected under metered conditions, this did not occur for coked catalysts.
Original language | English |
---|---|
Pages | 89-92 |
Number of pages | 4 |
DOIs | |
Publication status | Published - Mar 2011 |
Event | 10th International Bologna Conference on Magnetic Resonance in Porous Media - Leipzig, Germany Duration: 12 Sep 2010 → 16 Sep 2010 |
Conference
Conference | 10th International Bologna Conference on Magnetic Resonance in Porous Media |
---|---|
Country/Territory | Germany |
City | Leipzig |
Period | 12/09/10 → 16/09/10 |
Keywords
- percolation
- phase transitions
- porous materials
- structure of