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O: Fachverband Oberflächenphysik
O 16: Nanoscale Heterogeneous Catalysis
O 16.8: Vortrag
Montag, 16. März 2020, 17:00–17:15, TRE Ma
Ru/TiO2 catalysts in the CO2 methanation: chemical nature of Ru nanoparticles investigated by operando X-ray absorption spectroscopy — •Joachim Bansmann, Ali Abdel-Mageed, Shilong Chen, Klara Wiese, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm, Germany
The CO2 methanation (known as Sabatier reaction) is an important catalytic process for the conversion of CO2 to methane in H2 rich gas mixtures over Ni and Ru catalysts and has recently gained increasing interest due to its application in the power-to-gas technology.
In this contribution, we concentrate on the physical and chemical properties of Ru nanoparticles on Ru/TiO2 catalysts in the CO2 methanation using TiO2 (P90) supports. The catalysts were investigated at the ID 24 beamline at the ESRF (Grenoble) using operando X-ray absorption spectroscopy (XAS) at the Ru K edge in a CO2 reformate gas mixture at atmospheric pressure (15.5% CO2, balance H2) at 190C. Additionally, we applied a stepwise increase in the temperature up to 350C in the reaction gas mixture in order to activate the catalysts followed by measurements at 190C. XANES data showed a very high content of metallic Ru species during the activation period. The effect of the activation step on the activity and deactivation of the catalyst will be discussed based on simultaneously recorded IR/GC data. Furthermore, the results will be compared to recently obtained operando XAS in the CO methanation over Ru/TiO2 catalysts used in our group.