Stelter, MichaelDittmeyer, RolandHarpf, AnjaAnjaHarpf2025-03-062025-03-062025-03-062024https://publica.fraunhofer.de/handle/publica/485351Subject of the present work is the investigation of structure-property relationships of selected inorganic ceramic powder materials for the application as gas separation membranes. The aim is to use a magnetic suspension balance to obtain information about the suitability of inorganic powders for specific separation tasks more quickly and cost-effectively than is the case with conventional methods. Up to now, the membrane quality can be determined via permeation measurements of manufactured membranes. Researching a completely manufactured membrane is complex and expensive. By characterizing powders before the complex membrane production, research results could be achieved much more quickly and easily. To test the magnetic suspension balance regarding to its suitability as an efficient characterization option for ceramic powder materials, two representative questions in membrane technology are examined. Both sorption and stoichiometry properties of selected material classes will be examined thermogravimetrically, and the results will be evaluated accordingly. For stoichiometric investigations, a mixed-conducting oxide ceramic material with a perovskite structure (barium-strontium-cobalt ferrate, or BSCF for short) is used with the aim of separating oxygen. To characterize sorption properties, selected zeolites are analyzed for the separation of the gases carbon dioxide and hydrogen (sodalites) or carbon dioxide and methane (commercial and self-synthesized zeolites with a chabazite structure). In the perovskite material, the bonding relationships of the B cations (iron and cobalt) in the material are examined. This will change depending on the oxygen enrichment and removal. The processes can be determined quantitatively using a magnetic suspension balance. Other analytical methods, such as Mössbauer spectroscopy, provide information about the stoichiometry ratios and make it possible to classify the results. With selected zeolites of different structures, differences in sorption of the powders are determined using the magnetic suspension balance. The effects of structural differences in the zeolites on the adsorption characteristics are quantified. The different adsorption properties of template-containing powder (occupied zeolite pores) and template-free powder (free pores) provide important conclusions. The application of the magnetic suspension balance and its efficiency for solid-state chemistry issues in membrane synthesis is finally evaluated and it is determined to what extent magnetic levitation technology can be used economically in material development for ceramic membranes.deKeramische MembranenMagnetschwebewaage600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaftendoctoral thesis