Experimental and theoretical aspects of adsorption microcalorimetry applied to characterize hetereogeneous catalysts
- Adsorption microcalorimetry provides the study adsorption kinetics and thermodynamics, but theoretical methods were insufficient to evaluate these processes on energetically heterogeneous surfaces of catalysts. In this work they are established based on Transition State Theory and uniform energy distribution, and applied to investigate different adsorption systems. On ZnO, CO_2 adsorption revealed the block effect of OH groups; CO adsorption revealed the feature of active sites after various pretreatments. Their co-adsorption strengthened the adsorption of CO due to the increased Lewis acidity caused by adsorbed CO_2. The interaction of CO with supported gold catalysts consists of CO adsorption on Au and on metal cation, CO oxidation, and adsorption of CO_2 on supports. Compared with Au/alumina and Au/titania, the Au/ZnO catalyst has the largest amount of removable oxygen, strongest interaction between CO, O_2 and the support, and the weakest interaction between CO and Au.
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| Author: | Xinyu Xia |
|---|---|
| URN: | urn:nbn:de:hbz:294-16699 |
| Referee: | Martin MuhlerORCiDGND, Wolfgang GrünertGND |
| Document Type: | Doctoral Thesis |
| Language: | English |
| Date of Publication (online): | 2006/07/24 |
| Date of first Publication: | 2006/07/24 |
| Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
| Granting Institution: | Ruhr-Universität Bochum, Fakultät für Chemie und Biochemie |
| Date of final exam: | 2006/06/28 |
| Creating Corporation: | Fakultät für Chemie und Biochemie |
| GND-Keyword: | Adsorption; Mikrokalorimetrie; Desorption / Temperaturprogrammierung; Zinkoxid; Katalysator |
| Institutes/Facilities: | Lehrstuhl für Technische Chemie |
| Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Chemie, Kristallographie, Mineralogie |
| Licence (German): |  Keine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht |
