NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129
Gas-phase magnetic resonance imaging (MRI) has been used to investigate heterogeneity in mass transport in a packed bed of commercial, alumina, catalyst supports. Hyperpolarized 129Xe MRI enables study of transient diffusion for micro- scopic porous systems using xenon chemical shift to selectively...
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| Format: | Article |
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Wiley
2015
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| Online Access: | https://eprints.nottingham.ac.uk/31530/ |
| _version_ | 1848794220401262592 |
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| author | Pavlovskaya, Galina E. Six, Joseph S. Meersman, Thomas Gopinathan, Navin Rigby, Sean P. |
| author_facet | Pavlovskaya, Galina E. Six, Joseph S. Meersman, Thomas Gopinathan, Navin Rigby, Sean P. |
| author_sort | Pavlovskaya, Galina E. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Gas-phase magnetic resonance imaging (MRI) has been used to investigate heterogeneity in mass transport in a packed bed of commercial, alumina, catalyst supports. Hyperpolarized 129Xe MRI enables study of transient diffusion for micro- scopic porous systems using xenon chemical shift to selectively image gas within the pores, and, thence, permits study of low-density, gas-phase mass-transport, such that diffusion can be studied in the Knudsen regime, and not just the molecular regime, which is the limitation with other current techniques. Knudsen-regime diffusion is common in many industrial, catalytic processes. Significantly, larger spatial variability in mass transport rates across the packed bed was found compared to techniques using only molecular diffusion. It has thus been found that that these heterogeneities arise over length-scales much larger than |
| first_indexed | 2025-11-14T19:12:44Z |
| format | Article |
| id | nottingham-31530 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:12:44Z |
| publishDate | 2015 |
| publisher | Wiley |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-315302020-05-04T20:06:32Z https://eprints.nottingham.ac.uk/31530/ NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 Pavlovskaya, Galina E. Six, Joseph S. Meersman, Thomas Gopinathan, Navin Rigby, Sean P. Gas-phase magnetic resonance imaging (MRI) has been used to investigate heterogeneity in mass transport in a packed bed of commercial, alumina, catalyst supports. Hyperpolarized 129Xe MRI enables study of transient diffusion for micro- scopic porous systems using xenon chemical shift to selectively image gas within the pores, and, thence, permits study of low-density, gas-phase mass-transport, such that diffusion can be studied in the Knudsen regime, and not just the molecular regime, which is the limitation with other current techniques. Knudsen-regime diffusion is common in many industrial, catalytic processes. Significantly, larger spatial variability in mass transport rates across the packed bed was found compared to techniques using only molecular diffusion. It has thus been found that that these heterogeneities arise over length-scales much larger than Wiley 2015-11 Article PeerReviewed Pavlovskaya, Galina E., Six, Joseph S., Meersman, Thomas, Gopinathan, Navin and Rigby, Sean P. (2015) NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129. AIChE Journal, 61 (11). pp. 4013-4016. ISSN 1547-5905 gas-phase magnetic resonance imaging hyperpolarized xenon Knudsen diffusion catalyst support http://onlinelibrary.wiley.com/doi/10.1002/aic.14929/abstract doi:10.1002/aic.14929 doi:10.1002/aic.14929 |
| spellingShingle | gas-phase magnetic resonance imaging hyperpolarized xenon Knudsen diffusion catalyst support Pavlovskaya, Galina E. Six, Joseph S. Meersman, Thomas Gopinathan, Navin Rigby, Sean P. NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title | NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title_full | NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title_fullStr | NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title_full_unstemmed | NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title_short | NMR Imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| title_sort | nmr imaging of low pressure, gas-phase transport in packed beds using hyperpolarized xenon-129 |
| topic | gas-phase magnetic resonance imaging hyperpolarized xenon Knudsen diffusion catalyst support |
| url | https://eprints.nottingham.ac.uk/31530/ https://eprints.nottingham.ac.uk/31530/ https://eprints.nottingham.ac.uk/31530/ |