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Sulfidability and thiophene hydrodesulfurization activity of supported NiMo carbides

Abstract:

Ni-Mo carbides supported on activated carbon were synthesized by carbothermal hydrogen reduction and the effect of the sulfidability on the thiophene hydrodesulfurization catalytic activity was studied. The X-ray diffraction patterns of Ni-Mo carbides showed the presence of β-Mo 2C and NiC when the atomic ratio AR = Ni/(Ni + Mo) was between 0.25 and 0.75, while for AR = 1, it only was detected metallic Ni. The X-ray photoelectron spectroscopy results showed the distribution of different surface species in the passivated catalysts: Moδ + (0 ≥ δ ≤ 2), Mo4 +, Mo6 +, Niδ + and Ni 2 +. After sulfiding the carbides were modified in their surface and catalytic activity. © 2014 Elsevier B.V.