Determination of the spatial location of coke in catalysts by a novel NMR approach

Navin Gopinathan, Sean Rigby, Malcolm Greaves, J Lowe, J Wood, L L Dong, P Fantazzini (Editor), V Bortolotti (Editor), J Karger (Editor), P Galvosas (Editor)

Research output: Contribution to conferencePaper

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 languageEnglish
Pages89-92
Number of pages4
DOIs
Publication statusPublished - Mar 2011
Event10th International Bologna Conference on Magnetic Resonance in Porous Media - Leipzig, Germany
Duration: 12 Sep 201016 Sep 2010

Conference

Conference10th International Bologna Conference on Magnetic Resonance in Porous Media
CountryGermany
CityLeipzig
Period12/09/1016/09/10

Keywords

  • percolation
  • phase transitions
  • porous materials
  • structure of

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