Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 39: Heterogeneous Catalysis
O 39.6: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
Heterogeneous Catalysis Driven by Piezoelectric and Pyroelectric Materials — •Maximilian Sonntag, Mateo Ureña de Vivanco, Bianca Störr, Erik Mehner, Juliane Hanzig, Tilmann Leisegang, and Dirk C. Meyer — TU Bergakademie Freiberg, Institut für Experimentelle Physik, Leipziger Straße 23, 09596 Freiberg
Approximately 90 % of all chemical processes are based on heterogeneous catalysis.1 Conventional catalysis is often limited to high temperatures like for ammonia synthesis in order to activate the catalyst. Nevertheless, the use of low temperature waste heat or vibrations can also enhance catalytic reactions. Pyroelectric materials can generate charges by converting heat, whereas piezoelectric materials can generate charges from vibrations. These coupling phenomena provide electrical charges for the redox reactions (piezocatalysis2 and pyrocatalysis3).
Utilizing LiNbO3, we present catalytic decolorization of organic and inorganic indicators. Oxidation of indigo carmine and reduction of permanganate take place in aquatic solution under ultrasonic vibration. Results show that several radical species may be formed in water during mechanical stimulation.
[1] J. A. Dumesic, G. W. Huber, M. Boudart, Handbook of Heterogeneous Catalysis, Vol. 1, 2nd ed., 2008, p.1. [2] K.-S. Hong, H. Xu, H. Konishi, X. Li, J. Phys. Chem. Lett. 2010, 1, 997 and J. Phys. Chem. C 2012, 116, 13045; M. B. Starr, X. Wang, Sci. Rep. 2013, 3, Art. 2160. [3] E. Gutmann, A. Benke, K. Gerth, H. Böttcher, E. Mehner, C. Klein, U. Krause-Buchholz, U. Bergmann, W. Pompe, D. C. Meyer, J. Phys. Chem. C 2012, 119, 5383.