Abstract
Combined operando UV/vis-Raman spectroscopy has been used to study the deactivation of CrOx/Al2O3 catalyst extrudates in a pilot scale propane dehydrogenation reactor. For this purpose, UV/vis and Raman optical fiber probes have been designed, constructed and tested. The light absorption measured by operando UV/vis spectroscopy was used to correct for the effect of catalyst darkening. This makes operando Raman spectroscopy a quantitative technique to follow the formation of coke deposits on-line during the first hour of catalytic propane dehydrogenation process. The probe was used to study the coke deposition at the top and bottom of the reactor. Differences in the rate of coke deposition were observed, which were related to the local temperature of the catalyst bed. The chemical nature of the coke deposits formed on a catalyst extrudate, as expressed by the D-1/G ratio, was independent of reaction time as well as of the position of the catalyst extrudate within the reactor bed.
| Original language | English |
|---|---|
| Pages (from-to) | 3139-3145 |
| Number of pages | 7 |
| Journal | ChemCatChem |
| Volume | 6 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2014 |
Funding
Maria Arias and Tom Visser (Utrecht University) are acknowledged for their work in the design and construction of the pilot-scale reactor. Willem Jan Mulder, Albert Borreman and Rene Teunissen (Avantes) are thanked for their work in the design and construction of the operando UV/vis and Raman probes. The authors acknowledge the Netherlands Research School Combination Catalysis (NRSC-C) for funding. We would also like to thank BASF, Dr. Robert Terorde, and Dr. Peter Berben for providing the dehydrogenation catalysts.
Keywords
- CrOx/Al2O3
- dehydrogenation
- operando spectroscopy
- pilot-scale reactor
- propane
- Raman spectroscopy
- CHROMIUM-OXIDE CATALYSTS
- DEACTIVATION