Abstract
The porous texture of oceanic polymetallic nodules used as catalysts for demetallation and desulphurization of petroleum residua in a trickle bed reactor was studied after reaction. Four techniques were considered: analysis of nitrogen physical adsorption—desorption isotherms, X-ray diffractometry, mercury penetration and electronic microscopy. The nodules present a remarkable specific surface area and porosity, which are partially conserved at high temperatures even under the drastic conditions of hydrotreatment.
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