Abstract
When CoMoO 4, NiMoO 4, CaMoO 4, CaWO 4, NiWO 4, and CaWO 4 are treated at 400 °C for 3.5 h in a 10% H 2S H 2 flow, which are experimental conditions commonly used for the sulfidation of hydrodesulfurization catalysts, the products obtained are the sulfides MoS 2, WS 2, Co 9S 8, NiS, and CaS, respectively. The increase of the sulfidation temperature of unsupported CoMo samples prepared by the homogeneous sulfide precipitation procedure, leads to a displacement of the cobalt located at the surface of the CoMoS phase.
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