Measuring stand for dynamic physisorption and chemisorption

• Subject Area: Molecular Chemistry
• Term: Funded in 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 548349728

Sorption analyses are used as an analytical method both in basic research and in applied research to investigate nanomaterials and porous compounds. They are indispensable in many areas of solid-state chemistry and materials research. Static and dynamic measurements can be used to obtain information about the specific surface area, pore diameter, host-guest interactions, hydrophilicity/hydrophobicity of the pore surface or about the storage or separation of molecules and gases. The static measurement methods already available in the laboratory for surface and pore analysis are to be expanded to include dynamic measurement methods in order to be able to carry out more application-related investigations. The proposed measuring stand for dynamic sorption investigations is to be used primarily for the adsorption and separation of gases and vapors as well as for the characterization of catalysts, but is also available to colleagues at Kiel University, in particular colleagues from the Faculty of Engineering, as well as external interested parties. The measuring stand is particularly relevant for the nano and interface sciences at Kiel University, which are bundled in the university-wide research focus KiNSIS (Kiel Nano Surface and Interface Science). The research projects in which the measuring stand is to be used cover a broad spectrum of complementary subjects and include both physisorption and chemisorption measurements. In the physisorption measurements, gases as well as vapors and complex mixtures (especially humid gas flows) with up to four components are to be investigated. The focus of the investigations is on measurements on the fixed bed adsorber, which can be carried out with small sample quantities. Sorption kinetics and selectivities can be determined with the aid of breakthrough curves. In addition, a membrane measuring cell is to be procured to enable the characterization of membranes for substance separation. Multi-component mixtures are to be analyzed using mass spectrometry to enable precise gas analysis. The chemisorption tests will be used in particular to characterize catalysts and other substances with reactive surfaces. For heterogeneous catalysis, measurements of probe and reactant molecules in particular are required. For research projects on the activation of small molecules, their interaction with the catalyst surfaces should be investigated under variable adsorption and desorption conditions. Mixtures of gases and vapors are of particular interest in order to determine the selectivity of this interaction. Time-resolved mass spectrometry is therefore required for the analysis. The investigations should preferably be carried out under dynamic conditions that come as close as possible to the catalytic reaction conditions.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Messstand für dynamische Sorptionsuntersuchungen
• Instrumentation Group: 1140 Adsorptionsanlagen, Wäscher, Trockner
• Applicant Institution: Christian-Albrechts-Universität zu Kiel
• Leader: Professor Dr. Norbert Stock