Effect of nitrogen compounds on deactivation of hydrotreating catalysts by coke

摘要

A series of coked catalysts containing different levels of coke were prespared in a batch autoclave by treatment of a sulfided CoMo catalyst with mixtures of vacuum gas oil (VGO) in mineral oil at 35 atm hydrogen and temperatures between 280 deg.C And 370 deg.C. A similar series of coked catalysts were prepared with acridine or carbazole added to the VGO mixture. After Extraction with xylene and resulfiding, the coked catalysts were analyzed for C, N, pore volume and surface area, and tested For hydrogenation of naphthalene and carbon -nitrogen hydrogenolysis of indole.