Transient kinetic studies on the dehydrogenation of ethylbenzene to styrene over Potassium-promoted iron oxide
- The transient kinetic experiments were carried out in a microreactor flow system equipped with MS and GC. In the initial periods, much higher initial activities of the catalysts were observed. The reason is due to the coupling of the dehydrogenation of ethylbenzene and the reducing of Fe\(_{2}\)O\(_{3}\). In combination with the results of the TPR and TPO, is found that the steam during the reaction stabilizes the iron oxide against total reduction to Fe. By steaming the activity of the catalyst could be partially recovered. The high K-promoted catalysts have obvious higher activities than that of the lower K-promoted and unpromoted catalysts. KFeO\(_{2}\) is considered the active phase, and CO\(_{2}\) formed during the reaction causes the decomposition of KFeO\(_{2}\). A modified schematic life cycle of the K-promoted styrene catalyst is proposed. The pre-coefficients and apparent activation energies are obtained through the data fitting in the range of T: 823 ~ 898 K; LHSV: 0.43 ~ 3 h\(^{-1}\); and S / O : 6 ~ 10.
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| Author: | Xiaomeng Zhu |
|---|---|
| URN: | urn:nbn:de:hbz:294-6598 |
| Referee: | Martin MuhlerORCiDGND, Wolfgang GrünertGND, William S. SheldrickGND |
| Document Type: | Doctoral Thesis |
| Language: | English |
| Date of Publication (online): | 2003/03/18 |
| Date of first Publication: | 2003/03/18 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Granting Institution: | Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie |
| Date of final exam: | 2002/12/12 |
| Creating Corporation: | Fakultät für Chemie und Biochemie |
| GND-Keyword: | Ethylbenzol / Dehydrierung; Katalysator; Reduktion (Chemie); Oxidation; Simulation / Kinetik |
| Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
| Licence (German): |  Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht |
