Abstract
Abstract Studies have been made on the role of promoter metals, cobalt and nickel, added to MoO 3 -Al 2 O 3 catalysts for hydrodemetalation (HDM), hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of heavy residual oils. The addition of nickel or cobalt has been confirmed to promote initial activities for both reactions of HDM and HDS. However, it has also been observed that deactivation rates are accelerated at the same time. It has been demonstrated in a hydrotreating test for 4,600 hours that the unpromoted MoO 3 -Al 2 O 3 catalyst achieved better HDM and HDS performance than the promoted catalyst when they were used in a guard reactor of HDS units processing heavy residual oils.
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