PREPARATION OF ALUMINA-SUPPORTED MOLYBDENA CATALYSTS BY NEW SLURRY IMPREGNATION METHOD - MOO3 AL2O3 SULFIDE HYDRODESULFURIZATION CATALYST/

A new slurry impregnation method (SIM) of the preparation of a catalys t or catalyst precursor MoO3/Al2O3 is described. Aqueous slurry of pow dered MoO3 is mixed with alumina extrudates and the mixture is refluxe d. A low solubility of MoO3 is sufficient for transport of MoO3 from p owder form via solution to the surface of the support. The catalysts w ere tested by hydrodesulfurization of thiophene at 1.6 MPa and 280-400 -degrees-C. Their activity was similar to the activity of industrial a nd laboratory MoO3/Al2O3 samples prepared by conventional impregnation with solution of ammonium heptamolybdate. The advantage of the SIM me thod is that calcination, producing nitrogeneous waste gases, is not r equired and that all deposited molybdenum species are adsorbed and not precipitated.