Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.15: Poster

Montag, 20. März 2017, 19:00–20:00, P4

Measurement and Modelling of the Efficiency of ortho/para Catalysts for Hydrogen — •Sebastian Mirz, Florian Altenbrand, Robin Größle, and Bennet Krasch — Tritium Laboratory Karlsruhe (TLK), Institute for Technical Physics (ITEP), Karlsruhe Institute of Technology (KIT)

The equilibrium ratio between ortho and para hydrogen is 3:1 at room temperature, whereas para hydrogen would be the only present species at absolute zero. The conversion between these two species is suppressed with time constants of the order of thousand hours in the gas phase and ten hours in the liquid phase, but can be catalytically accelerated. The TLK develops an analysis system for the hydrogen isotopologue concentration in the liquid phase in a cryogenic distillation collumn, based on IR absorption spectroscopy. An ortho/para catalyst is needed for the calibration of this system, due to the influence of the ortho/para ratio on the IR spectra. Therefore, an experiment is installed for the investigation of ortho/para catalyst performance at temperatures between 77 K and 400 K, to provide the necessary data for the design of this catalyst. The unique application of a Raman spectroscopy system enables the model-free real-time monitoring of the ortho/para ratio during conversion. This allows the extraction of the catalyst efficiency and additionally the distinction between physisorption and chemisorption processes. This contribution presents results of the measurement and modelling of the catalyst performance of an iron oxide catalyst.