This work is dealing with model studies on catalytic hydrodemetallization and hydrodesulfurization of heavy oils and residua. The catalytic hydrodemetallization was investigated in the presence of a sulfur component which is typical for petroleum. Model oils consisting of decalin, a nicke! porphyrin and dibenzothiophene were employed. The investigations were carried out in a flow-type high pressure unit with a fixed bed reactor on a sulfided Co0-MoO₃/Al₂O₃ hydrotreating catalyst. For analysis of the liquid product samples, which were sluiced out periodically in short intervals, atomic absorption spectroscopy, UVIVIS-spectroscopy, capillary gas chromatography and high pressure liquid chromatography were used. The degree of conversion for both reactions and the product distributions as a function of time on stream were thoroughly investigated. This enabled new insights into the mutual influences of hydrodemetallization "and hydrodesulfurization.
Fundamentals of the simultaneaus hydrodemetallization and hydrodesulfurization of heavy oils
Prof. Dr.-Ing. Jens Weitkamp
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