Microimaging of Transient Concentration Profiles of Reactant and Product Molecules during Catalytic Conversion in Nanoporous Materials |
| |
| Authors: | Tobias Titze Dr Christian Chmelik Jens Kullmann Dr Lutz Prager Prof Erich Miersemann Prof Roger Gläser Prof Dirk Enke Prof Jens Weitkamp Prof Jörg Kärger |
| |
| Institution: | 1. Department of Interface Physics, University of Leipzig, Linnéstrasse 5, 04103 Leipzig (Germany);2. Institute of Chemical Technology, University of Leipzig, Linnéstrasse 3, 04103 Leipzig (Germany);3. Leibniz Institute of Surface Modification, Permoserstrasse 15, 04318 Leipzig (Germany);4. Department of Mathematics, University of Leipzig, Augustusplatz 10/11, 04109 Leipzig (Germany);5. Institute of Chemical Technology, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart (Germany) |
| |
| Abstract: | Microimaging by IR microscopy is applied to the recording of the evolution of the concentration profiles of reactant and product molecules during catalytic reaction, notably during the hydrogenation of benzene to cyclohexane by nickel dispersed within a nanoporous glass. Being defined as the ratio between the reaction rate in the presence of and without diffusion limitation, the effectiveness factors of catalytic reactions were previously determined by deliberately varying the extent of transport limitation by changing a suitably chosen system parameter, such as the particle size and by comparison of the respective reaction rates. With the novel options of microimaging, effectiveness factors become accessible in a single measurement by simply monitoring the distribution of the reactant molecules over the catalyst particles. |
| |
| Keywords: | glasses heterogeneous catalysis reaction kinetics reaction mechanisms supported catalysts |
|
|
