HYDROCRACKING OF N-HEPTANE ON A SULFIDED NIMO-Y ZEOLITE CATALYST - EFFECT OF THE SULFIDATION METHOD

The activity and the selectivity of a bifunctional NiMo sulfides-Y zeo lite catalyst for n-heptane hydrocracking depend very much on the sulf idation agent, namely hydrogen sulfide, or dimethyldisulfide in soluti on in n-heptane or n-decane. The presence of a hydrocarbon during the sulfidation lowers the acid activity of the catalyst because of coking of the zeolite acid sites, and also decreases the hydrogenating activ ity, due to a poorer sulfidation of the catalyst.