CHEMISORPTION OF OXYGEN BY COKE DEPOSITED ON CATALYST SURFACE

Chemisorption of oxygen by nickel molybdate catalyst used for hydrotreating heavy oils was shown to increase with increasing temperature and reached a maximum at about 270 degree C. Yields of CO//2, CO and SO//2 formed during isothermal chemisorption were estimated by using a fixed-bed reactor. Experimental observations were interpreted in terms of a hydrocarbon autoxidation mechanism.