ABSTRACT
Hydroprocessing is an integral part of fuels and lubes refining. Most refinery streams are hydro-processed. Hydrogen consumption calculations were based on the increased hydrogen content in the liquid product and the hydrogencontent in the gaseous products. One may further speculate that the FeMo and commercial catalysts probably have more or less the same ability for the adsorption and hydrogenation of basicnitrogen heterocycles. Controlled synthesis of such complexes may well result in active hydroprocessing catalysts. Apparently, catalyst D had difficulties hydrogenating heavy refractory aromatics, although it was able to hydrogenate the reactive ones. In hydrodenitrogenation of basic nitrogen compounds over conventional catalysts, the weight of evidence indicates that hydrogenolysis appears to be the rate-limiting step under most commercial conditions. As for multiring nonbasic nitrogen compounds, indications are that the rate of hydrogenation can be much slower than that of hydrogenolysis.
