Comparison of the Desulfurization and Denitrogenation Activities of Monolith Alumna Impregnated with Cobalt and Molybdenum and Nalcomo 474 Catalyst

Abstract

The desulfurization and denitrogenation activities of two cobalt molybdenum-alumina catalysts were tested on two coal-derived liquids, a Synthoil liquid (a high-boiling stock), and raw anthracene oil (a low-boiling stock). One of the two catalysts was prepared in the laboratory by impregnating cobalt and molybdenum on a monolith alumina support received from Corning Glass Company. The other catalyst usedwas Nalcomo 474 (a commercial preparation) received from Nalco Chemical Company. Three reactor experiment runs were conducted with space time, temperature and pressure variations to study the effect of these parameters on sulfur and nitrogen removal. The pressures and temperatures employed were 500, 1000 and 1500 psig; and 650, 700 and 800 F (320, 371 and 426 C) respectively. The three volume hourly space times used were around 0.6 hours, 1.1 hours and 1.6 hours. The nominal hydrogen flow rate was 1500 scf/bbl of oil in all the runs. The activities of the two catalysts, on two feedstocks, were compared on volume, weight and surface area bases.