PFG NMR Studies of Zeolitic Diffusion

• Antragsteller: Professor Dr. Petrik Galvosas
• Fachliche Zuordnung: Physikalische Chemie von Festkörpern und Oberflächen, Materialcharakterisierung
• Förderung: Förderung von 2002 bis 2011
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5382057

Pulsed-field gradient NMR (PFG NMR) and quasi-elastic neutron scattering (QENS) are the two microscopic diffusion techniques, which are able to probe molecular diffusion over distances from the elementary steps up to the range of micrometers. By their coordinated application it should be possible, therefore, to directly record transport phenomena in nanoporous materials from the movement in the individual pores and cavities up to distances of the order of the particle dimensions. Taking profit of the availability of a large spectrum of important zeolite materials and other microporous solids like aluminophosphates, the diffusion results of these two techniques shall be compared with each other and with the results obtained by further (mostly non-equilibrium and macroscopic) measuring techniques. Discrepancies of up to several orders of magnitude between the results of different techniques are presently one of the most decisive obstacles of further progress in this field of science and its technical application, including such environmentally important fields like mass separation and conversion (catalysis) with a minimum input of raw materials and energy. Within the project, by the coordinated application of the two most direct measuring techniques of diffusion phenomena in nanoporous materials, a reliable basis of diffusion data shall be established, which is expected to decisively contribute to an eventual breakthrough in the clarification of a long-lasting problem.

• DFG-Verfahren: Sachbeihilfen
• Beteiligte Person: Professor Dr. Jörg Kärger