Journal
CHEMCATCHEM
Volume 11, Issue 20, Pages 5018-5021Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201901425
Keywords
CO2 hydrogenation; methanation of CO2; nickel; iron; x-ray absorption spectroscopy
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Funding
- German Federal Ministry of Education and Research (BMBF)
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An energy scenario, mainly based on renewables, requires efficient and flexible Power-to-X (P2X) storage technologies, including the methanation of CO2. As active Ni-0 surface sites of monometallic nickel-based catalysts are prone to surface oxidation under hydrogen-deficient conditions, we investigated iron as protective dopant. A combined operando X-ray absorption spectroscopy and X-ray diffraction setup with quantitative on-line product analysis was used to unravel the structure of Ni and Fe in an alloyed Ni-Fe/Al2O3 catalyst during dynamically driven methanation of CO2. We observed that Fe protects Ni from oxidation and is itself more dynamic in the oxidation and reduction process. Hence, such sacrificial or protective dopants added in order to preserve the catalytic activity under dynamic reaction conditions may not only be of high relevance with respect to fine-tuning of catalysts for future industrial P2X applications but certainly also of general interest.
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