Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 37, Pages 11957-11962Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201806354
Keywords
chemical imaging; Fischer-Tropsch synthesis; heterogeneous catalysis; nanoparticles; X-ray microspectroscopy
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Funding
- Netherlands Organization for Scientific Research (NWO)
- Shell Global Solutions International B.V.
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A state-of-the-art operando spectroscopic technique is applied to Co/TiO2 catalysts, which account for nearly half of the world's transportation fuels produced by Fischer-Tropsch catalysis. This allows determination of, at a spatial resolution of approximately 50 nm, the interdependence of formed hydrocarbon species in the inorganic catalyst. Observed trends show intra- and interparticular heterogeneities previously believed not to occur in particles under 200 mu m. These heterogeneities are strongly dependent on changes in H-2/CO ratio, but also on changes thereby induced on the Co and Ti valence states. We have captured the genesis of an active FTS particle over its propagation to steady-state operation, in which microgradients lead to the gradual saturation of the Co/TiO2 catalyst surface with long chain hydrocarbons (i.e., organic film formation).
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