Abstract
Carbon deposits on Ni-Mo-Al 2 O 3 catalysts appear, from nitrogen adsorption studies, to be rather uniformly distributed in catalyst pores. Scanning electron microscopic studies and chemical analyses showed that iron, titanium and calcium were major metal contaminents in the aged catalysts. Calcium deposited as a thin shell on the exterior of the pellet; it was at a low, background level a short distance into the interior of the pellet. Iron may deposit in a slight shell coating but, in general, it shows a gradual decline in concentration toward the center of the pellet. Titanium behavior was intermediate in character with both a shell coating and the gradual decline in concentration toward the interior. Concentration-time profiles showed that titanium deposited at a uniform rate throughout the run but both iron and calcium deposited more rapidly early in the run.
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