Nature of cobalt species during the in situ sulfurization of Co(Ni)Mo/Al2O3 hydrodesulfurization catalysts
| Autor: | Al Samarai, M., van Oversteeg, C.H.M., Delgado Jaime, M.U., Weng, Tsu Chien, Sokaras, Dimosthenis, Liu, B., van der Linden, M., van der Eerden, A.M.J., Vogt, E.T.C., Weckhuysen, B.M., de Groot, F.M.F., Sub Inorganic Chemistry and Catalysis, Inorganic Chemistry and Catalysis |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Materials science CoMoS structure chemistry.chemical_element resonant inelastic X-ray scattering (RIXS) hydrotreating catalysts 02 engineering and technology Heterogeneous catalysis 01 natural sciences Ion Catalysis Instrumentation X-ray absorption spectroscopy Radiation Valence (chemistry) Scattering 010401 analytical chemistry 021001 nanoscience & nanotechnology Research Papers 0104 chemical sciences Nickel heterogeneous catalysis chemistry Physical chemistry 0210 nano-technology Cobalt hydrodesulfurization (HDS) catalyst systems |
| Zdroj: | Journal of Synchrotron Radiation Journal of Synchrotron Radiation, 26(3), 811. International Union of Crystallography |
| ISSN: | 1600-5775 0909-0495 |
| Popis: | From 1s X-ray absorption and 1s3p resonant inelastic X-ray scattering, the valence, coordination and symmetry of cobalt ions were tracked in two cobalt-promoted molybdenum oxide precursors of the hydrodesulfurization catalyst system. The evolution in local structure and electronic properties of cobalt was investigated during in situ sulfurization. Using a combination of 1s X-ray absorption (XAS) and 1s3p resonant inelastic X-ray scattering (RIXS), the valence, coordination and symmetry of cobalt ions were tracked in two cobalt-promoted molybdenum oxide precursors of the hydrodesulfurization catalyst system, namely Co–Mo/Al2O3 and Co–Ni–Mo/Al2O3. Extended X-ray absorption fine structure shows that the Co—O bonds were replaced with Co—S bonds as a function of reaction temperature. The cobalt K pre-edge intensity shows that the symmetry of cobalt was modified from Co3+ O h and Co2+ O h to a Co2+ ion where the inversion symmetry is broken, in agreement with a square-pyramidal site. The 1s3p RIXS data revealed the presence of an intermediate cobalt oxy-sulfide species. This species was not detected from XAS and was determined from the increased information obtained from the 1s3p RIXS data. The cobalt XAS and RIXS data show that nickel has a significant influence on the formation of the cobalt oxy-sulfide intermediate species prior to achieving the fully sulfided state at T > 400°C. |
| Databáze: | OpenAIRE |
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