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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 75: Fundamentals of Catalysis I

O 75.6: Vortrag

Donnerstag, 4. April 2019, 12:00–12:15, H5

Ru/TiO2 catalysts in the CO methanation: influence of the TiO2 morphology on the activation and the chemical nature of Ru investigated by operando X-ray absorption spectroscopyShilong Chen1, •Joachim Bansmann1, Ali Abdel-Mageed1, Dan Li2, Weixin Huang2, and R. Jürgen Behm11Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany — 2Dept. of Chemical Physics, University of Science and Technology of China, Hefei, China

The selective CO methanation recently proved to be a competitive substitute for the preferential CO oxidation in the purification of CO2-rich H2 feed gases. In this contribution, we concentrate on the physical and chemical properties of Ru nanoparticles on Ru/TiO2 catalysts in the CO methanation using TiO2 supports with different morphologies. 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 an idealized reformate at atmospheric pressure (0.6% CO, 3% N2, balance H2) at 190C. Ru/TiO2-{001} catalysts experience a much faster activation, however, also a more pronounced deactivation compared to Ru/TiO2-{100} catalysts. Measurements in the XANES region showed a higher content of oxidic species on Ru/TiO2-{100} catalysts during the activation period which seems to be related to the lower activity. These findings will be discussed with respect to simultaneously recorded IR data and results obtained from different Ru/TiO2 catalysts used in our group.

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