Influence of sulfur containing compounds on high temperature coke formation on hydrotreating catalyst

NiMo/Al 2 O 3 (sulfided and oxide) catalysts were coked in an autoclaves reactor at 400°C with anthracene as a precursor of coke. When the carbon content increased, the specific surface and the pore volume decreased. This corresponds to a partial blockage of the catalyst pores. The presence of dimetnyldisulfide (DMDS) promoted the coke formation on the catalyst surface. The formation of CH 3 S radicals from the decomposition of DMDS could promote the polycondensation of anthracene.