In the present work NiMo sulfide submicrometric particles were prepared by precipitation of the sulfide, or its precursor, using water in oil (w/o) emulsions formed by irradiating the system with high intensity ultrasound. Two types of precipitations were used, one similar to the reported homogenous precipitation (1), and another using ammonium tetrathiomolybdate and ethylenediamine similar to the methodology reported by Ho et al. (2,3) For the sake of comparison solids were also prepared by simple precipitation (no ultrasound). The particles thus obtained were characterized by X-Ray Diffraction (XRD), Dynamic Light Scattering (DLS) and X Ray Photoelectron Spectroscopy (XPS). Their catalytic activity for the hydrodesulfurization (HDS) of dibenzothiophene (DBT) was also tested. NiMo sulfide particles with diameters in the range of 140-190 nm were prepared by precipitation from emulsions obtained by ultrasonic irradiation.  The particles thus prepared are very active for the HDS of DBT and the activity is importantly improved by precipitating the particles using ethylenediamine as chelating agent.References: 1.        Karroua, M.; Matralis, H.; Grange, P.; and Delmon, B. Bull. Soc. Chim. Belg. 1995, 104, 11.2.        Ho, T.C.; Chianelli, R.R.; and Jacobson A.J. Applied Catalysis A: General. 1994, 114, 127.3.        Ho, T.C.; Jacobson A.J.; Chianelli, R.R.; and Lund, R.F. J. Catal. 1992, 138, 351.

Unsupported NiMoS catalysts prepared from emulsions formed by ultrasonic irradiation

248th National Meeting (2014)

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