EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

As carbon dioxide and the green house effect caused by it, is of major concern for humanity, countless efforts are made to provide solution. One route is to convert the excess carbon dioxide into valuable feedstock materials for the chemical indsutry. Since the stability of carbon dioxide necessitates the use of catalysts, interest is high in development and improvement of catalytic materials or systems.
Here we report on the catalytic behaviour of Fe-Ni alloy plates, which were tested in carbon dioxide hydrogenation reaction at low temperatures (<200°C) and atmospheric pressure. The Fe-Ni nanocrystalline alloy plates were created by high pressure torsion (HPT) method, where our main goal was to achieve reasonable microstructural homogenity. To vary the mictrostructures of the produced plates, different parameters and setups were used where the extent of straining forces and number of torsional revolutions were the variable parameters.
The created samples were characterized by TEM, XRD and XPS methods. The reactions were followed in a batch reactor setup with the aid of a gas chromatograph equipped with TCD and FID detectors. Carbon dioxide consumption, conversion of the reactants and selectivity of the reaction were tracked. We elucidate the mechanism of the reactions with in situ DRIFTS measurements and the possible reactions pathways were studied.