Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Atmospheric Plasmas and their Applications IV

P 14.3: Vortrag

Mittwoch, 2. April 2025, 14:30–14:45, ZHG006

In situ XRD and XAS at Plasma Treatment of Ce(IV)-O-Clusters and Ce(IV)-MOFs — •Alexander Quack¹, Diletta Morelli Venturi², Hauke Rohr², Tim Graupner², Anastasia Molokova³, Kirill Lomachenko³, Kerstin Sgonina¹, Malte Behrens^2,4, Norbert Stock^2,4, and Jan Benedikt^1,4 — ¹Institute of Experimental and Applied Physics, Kiel University — ²Institute of Inorganic Chemistry, Kiel University — ³European Synchrotron Radiation Facility (ESRF), Grenoble — ⁴Kiel Nano, Surface and Interface Science (KINSIS), Kiel University

The utilization of non-thermal atmospheric pressure plasmas, to supplement the existing chemical industry by using access renewable resources, allows for the potential usage of less heat resilient catalysts like metal-organic-frameworks (MOFs). While some MOFs are observed to be stable, while other MOFs are not, the exact processes of decomposition of the MOFs has not directly been investigated.

We have developed a dielectric barrier reactor with an open optical axis to allow for in situ x-ray analysis of material within the plasma. The plasma operates with H₂ gas combined with Ar or CO₂ at 20 kHz at 10-15 kV_pp and can be externally heated up to 200 ^∘C. This design was employed during the beam-time of CH-7281 at BM-23 at the European Synchrotron Radiation Facility (ESRF) to treat clusters and MOFs containing cerium. The chemical stability of these compounds was analyzed using in situ x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS).

Keywords: Plasma Catalysis; Synchrotron Radiation; Dielectric Barrier Discharge; Metal-Organic-Frameworks