Mixed sulfides based on Mo and Ni consist typically of MoS
2, NiMoS, and NiS
x phases. The latter are detrimental to catalytic activity because of intrinsically low activity of NiS
x, leading to quasi-inert catalyst mass, blocking active sites. For reductive desulfurization, the post-synthetic removal of NiS
x enhances hydrogenation rates of the mixed sulfide phase and highlights correlations between active site concentration and activity. For fatty acid deoxygenation, all phases show comparable intrinsic rates, but vastly different selectivity. Here, Ni opens an additional pathway involving the breaking of C-C bonds.
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Mixed sulfides based on Mo and Ni consist typically of MoS
2, NiMoS, and NiS
x phases. The latter are detrimental to catalytic activity because of intrinsically low activity of NiS
x, leading to quasi-inert catalyst mass, blocking active sites. For reductive desulfurization, the post-synthetic removal of NiS
x enhances hydrogenation rates of the mixed sulfide phase and highlights correlations between active site concentration and activity. For fatty acid deoxygenation, all phases show comparable int...
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