Journal article 627 views 168 downloads
A three-dimensional view of structural changes caused by deactivation of fluid catalytic cracking catalysts
J. Ihli,
R. R. Jacob,
M. Holler,
M. Guizar-Sicairos,
A. Diaz,
J. C. da Silva,
D. Ferreira Sanchez,
F. Krumeich,
D. Grolimund,
M. Taddei,
W. -C. Cheng,
Y. Shu,
A. Menzel,
J. A. van Bokhoven,
Marco Taddei 
Nature Communications, Volume: 8, Issue: 1
Swansea University Author:
Marco Taddei
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DOI (Published version): 10.1038/s41467-017-00789-w
Abstract
Since its commercial introduction three-quarters of a century ago, fluid catalytic cracking has been one of the most important conversion processes in the petroleum industry. In this process, porous composites composed of zeolite and clay crack the heavy fractions in crude oil into transportation fu...
| Published in: | Nature Communications |
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| ISSN: | 2041-1723 |
| Published: |
2017
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa36835 |
| Abstract: |
Since its commercial introduction three-quarters of a century ago, fluid catalytic cracking has been one of the most important conversion processes in the petroleum industry. In this process, porous composites composed of zeolite and clay crack the heavy fractions in crude oil into transportation fuel and petrochemical feedstocks. Yet, over time the catalytic activity of these composite particles decreases. Here, we report on ptychographic tomography, diffraction, and fluorescence tomography, as well as electron microscopy measurements, which elucidate the structural changes that lead to catalyst deactivation. In combination, these measurements reveal zeolite amorphization and distinct structural changes on the particle exterior as the driving forces behind catalyst deactivation. Amorphization of zeolites, in particular, close to the particle exterior, results in a reduction of catalytic capacity. A concretion of the outermost particle layer into a dense amorphous silica–alumina shell further reduces the mass transport to the active sites within the composite. |
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| Keywords: |
Heterogeneous catalysis, Phase-contrast microscopy, Porous materials |
| College: |
Faculty of Science and Engineering |
| Issue: |
1 |