Abstract
Effects of hydrodemetallization (HDM) operation conditions (temperature, LHSV and H2/Oil) on the subsequent deactivation of hydrodesulfurization (HDS) catalysts were examined using Kuwait atmospheric residue and the deactivation mechanism was discussed. It was found that there existed an optimum HDM temperature around 673 K to suppress the deactivation of HDS catalysts. The effect of LHSV on the HDS catalyst fouling depended on an HDM temperature, while that of H2/Oil was little observed. It was confirmed that the deactivation of HDS catalysts was mainly due to coke and that asphaltene quality rather than its quantity played a key role in the catalyst deactivation.
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