Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Atmospheric Pressure Plasmas and their Applications IV
P 18.6: Vortrag
Mittwoch, 28. Februar 2024, 18:00–18:15, WW 1: HS
Durability of metal-organic-frameworks (MOFs) in non-equilibrium atmospheric pressure plasmas — •Alexander Quack1, Hauke Rohr2, Kerstin Sgonina1, Norbert Stock2,3, and Jan Benedikt1,3 — 1Institute of Experimental and Applied Physics, Kiel University — 2Institute of Inorganic Chemistry, Kiel University — 3KINSIS, Kiel University
Metal-organic-frameworks (MOFs) have a high porosity and large surface area, which gives them potential catalytic properties. Nevertheless, MOFs mostly can not withstand high temperatures and pressures, which are needed in classical catalytic reactions. Non-equilibrium atmospheric pressure plasmas provide reactive and internally excited species and allow for plasma assisted catalysis at lower temperatures. For these processes MOFs can be used as a catalyst if they withstand the plasma conditions.
We have developed a DBD reactor (21 kHz, 16 kVpp) to determine the stability and suitability of different MOFs for plasma assisted catalysis. Reactive plasmas using gas mixtures based on N2, H2 and CO2 gases and in-plasma treatment under externally controlled temperature up to 200 ∘C have been applied to several MOFs including ZIF-8, ZIF-67 and MAF-6. The plasma exhaust is analyzed for chemical products like NH3 or CH4 using a quadrupole mass spectrometer. Additionally, the structural and chemical stability of the MOFs is examined with methods like XRD and FTIR. The results of both measurements are combined to judge the stability and suitability of the different MOFs and their chemical components for in-plasma catalysis applications.
Keywords: Plasma catalysis; Metal-organic-frameworks; Mass spectrometry; Atmospheric pressure plasma; Dielectric barrier discharge