Determination of the spatial location of coke in catalysts by a novel NMR approach
Gopinathan, N., Rigby, S., Greaves, M., Lowe, J., Wood, J. and Dong, L. L., 2011. Determination of the spatial location of coke in catalysts by a novel NMR approach. In: Fantazzini, P., Bortolotti, V., Karger, J. and Galvosas, P., eds. 10th International Bologna Conference on Magnetic Resonance in Porous Media, 2010-09-12 - 2010-09-16, Leipzig.
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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.
|Item Type||Conference or Workshop Items (Paper)|
|Creators||Gopinathan, N., Rigby, S., Greaves, M., Lowe, J., Wood, J. and Dong, L. L.|
|Editors||Fantazzini, P., Bortolotti, V., Karger, J. and Galvosas, P.|
|Uncontrolled Keywords||percolation, phase transitions, porous materials, structure of|
|Departments||Faculty of Engineering & Design > Chemical Engineering|
|Additional Information||Proceedings paper from the 10th International Bologna Conference on Magnetic Resonance in Porous Media. 12-16 September 2010. Leipzig, Germany.|
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