On the contributions of feed components to hydrotreatment catalyst coking

The coking ability of some hydrocarbons (benzene, n-heptane, styrene, methy lnaphthalene, durene, and phenanthrene) and heterocyclic compounds (thiophe ne and indole) under the conditions of hydrotreatment of feed is estimated for an Ai-Co-Mo catalyst. The method of isotopic labels is used to determin e the contributions of the components of binary mixtures to the formation o f coke on the catalyst surface. These contributions do not coincide with th e values of coking ability found for individual compounds.