Date/Time
08.05.2025
2:00 pm – 3:00 pm
Location
Lecture Hall 55.02
Pfaffenwaldring 55
70569 Stuttgart
We are very happy to welcome within the CRC 1333 Colloquium Series:
Prof. Unni Olsbye
Thursday, 8 May , 2025, 2:00-3:00 pm
Department of Chemistry, University of Oslo
Topic: “Studies of diffusion and acid-catalyzed reactions in zeolites“
Her research is mainly directed towards structure-composition-function correlations in catalytic reactions, with emphasis on mechanistic studies of target- and by-product formation. In recent years, major efforts have been devoted to study the influence of confinement effects in micro- and nanoporous materials.
Processes studied include C-H activation, C-O activation, methanol to hydrocarbons (olefins and gasoline), methane partial oxidation to methanol and to syngas, light alkane dehydrogenation, methyl halide conversion, ethene oxychlorination, CO2 conversion.
Abstract:
Coupled diffusion and acid-catalyzed reactions in zeolites control a multitude of industrially important chemistries. Fundamental studies of such processes will lead to better understanding of structure-performance relationships, and may ultimately form the basis of predictive models aimed at tailoring catalysts for next generation, renewable-based chemical industry.
In our group, methylation of light alkenes and arenes are studied as model reactions to unravel details of the coupled diffusion-reaction scheme.1-6 In this lecture, I will present steady-state and transient studies leading to enhanced insight in the influence of electronic and steric properties of the active site and its surroundings on methylation rates as well as competing reactions. Furthermore, I will present our approach of using the Temporal Analysis of Products pulse-response technique for studies of molecular transport of low weight guest molecules in zeolites.
References
- Mortén, M.; Cordero-Lanzac, T.; Cnudde, P.; Redekop, E.A.; Svelle, S.; van Speybroeck, V.; Olsbye, U.; Acidity effect on benzene methylation kinetics over substituted H-MeAlPO-5 catalysts. Journal of Catalysis, 2021, 404, 594-606.
- Cnudde, P; Redekop, EA; Dai, W.; Porcaro, N.G.; Waroquier, M.; Bordiga, S.; Hunger, M.; Li, L.; Olsbye, U.; Van Speybroeck, V.; Experimental and Theoretical Evidence for the Promotional Effect of Acid Sites on the Diffusion of Alkenes through Small-Pore Zeolites. Angewandte Chemie – International Edition, 2021, 60(18), 10016-10022.
- Redekop. E.; Lazzarini, A.; Bordiga, S.; Olsbye, U.; A temporal analysis of products (TAP) study of C2-C4 alkene reactions with a well-defined pool of methylating species on ZSM-22 zeolite. Journal of Catalysis 2020, 385, 300-312.
- Martínez-Espín, J. S.; De Wispelaere, K.; Janssens, T. V. W.; Svelle, S.; Lillerud, K. P.; Beato, P.; Van Speybroeck, V.; Olsbye, U., Hydrogen Transfer versus Methylation: On the Genesis of Aromatics Formation in the Methanol-To-Hydrocarbons Reaction over H-ZSM-5. ACS Catalysis 2017, 7, 5773-5780.
- Martinez-Espin, J. S.; De Wispelaere, K.; Westgård Erichsen, M.; Svelle, S.; Janssens, T. V. W.; Van Speybroeck, V.; Beato, P.; Olsbye, U., Benzene co-reaction with methanol and dimethyl ether over zeolite and zeotype catalysts: Evidence of parallel reaction paths to toluene and diphenylmethane. Journal of Catalysis 2017, 349, 136-148.
- Brogaard, R. Y.; Henry, R.; Schuurman, Y.; Medford, A. J.; Moses, P. G.; Beato, P.; Svelle, S.; Nørskov, J. K.; Olsbye, U., Methanol-to-hydrocarbons conversion: The alkene methylation pathway. Journal of Catalysis 2014, 314, 159-169.
The CRC cordially invites all who are interested to the lecture.