Our previously discovered, low-temperature route for the preparation of ternary molybdenum sulfide cluster compounds containing the Mo6S8 structure has been used to synthesize a new Pt (PtMoS) material. Ion-exchange of amorphous NaMoS with [Pt(NH3)4]Cl2 led to incorporation of the [Pt(NH3)4]2+ cation yielding [Pt(NH3)4](Mo6S8)S·x(H2O/MeOH), as confirmed by infrared and X-ray photoelectron spectroscopic (XPS) characterization. XPS indicated that this new platinum material had the reduced molybdenum oxidation state characteristic of ternary molybdenum sulfides containing the Mo6S8 structural unit. The surface area of the new PtMoS material was as high as 135 m2/g. Attempts to convert the PtMoS material to a crystalline Chevrel phase PtMo6S8 by H2 reduction at elevated temperatures were unsuccessful. However, H2 treatment at 400 °C provided material retaining the Mo6S8 cluster, probably as amorphous Pt(Mo6S8)S. The latter material is a very active hydrodesulfurization (HDS) catalyst, with much higher activity compared to other more stable compounds containing the Mo6S8 cluster unit.
ASJC Scopus subject areas
- Metals and Alloys