The rate of phenanthrene hydrogenation correlates with the amount of accessible Ni-promoted sites located at the edges of Mo/WS2 slabs. For low Ni-decoration degrees the influence of less active unpromoted sites dominates the overall hydrogenation activity. At high Ni contents, large NixSy particles block active sites but contribute to the overall hydrogenation activity to small extent. However, the site-specific activity of Ni-edge sites, revealed by a new developed operando technique, is independent of surrounding Mo or W atoms, while being more active than unpromoted sites.
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The rate of phenanthrene hydrogenation correlates with the amount of accessible Ni-promoted sites located at the edges of Mo/WS2 slabs. For low Ni-decoration degrees the influence of less active unpromoted sites dominates the overall hydrogenation activity. At high Ni contents, large NixSy particles block active sites but contribute to the overall hydrogenation activity to small extent. However, the site-specific activity of Ni-edge sites, revealed by a new developed operando technique, is indep...
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