Abstract. Ni-containing Calcium Hydroxyapatite (NiCaHAp; 3.31 wt.% Ni) was synthesized by coprecipitation and used as catalyst support. Molybdenum was supported on NiCaHAp by impregnation using ammonium heptamolybdate. The prepared catalysts Mo(x)/NiCaHAp (x: 2 to 8 wt % in Mo) were characterized by elemental analysis, XRD, FT-IR, N 2 adsorptiondesorption and TEM-EDX. The catalysts were sulfided in-situ at 673 K under flowing H 2 S/H 2 (15 Vol.% H 2 S) and tested in hydrodesulfurization (HDS) of thiophene at 673 K. The main XRD peaks of hydroxyapatite CaHAp phase were observed in all samples and a peak due probably to crystalline MoO 3 phase was also identified from the results. However, no crystalline phase of NiO was found for the catalysts, which showed its Ni species were highly dispersed. The sulfided catalysts Mo(x)/NiCaHAp presented are active in HDS of thiophene, despite the presence of some large MoO 3 crystallites and incomplete sulfidation. This activity may be due to interaction of NiO and MoO 3 on CaHAp resulting in the formation of Ni-Mo-S phase under flowing H 2 S/H 2 . When the molybdenum content increased the HDS activity increasead slightly, which was caused by the agglomeration of MoO 3 . The Mo(8)/NiCaHAp catalyst is about two times less active for thiophene HDS than the commercial NiMoP/Al 2 O 3 .
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