Abstract
A comparison of the results using Ni-W and Ni-Mo loaded catalysts with desulfurized vacuum gas oil shows that both the fixed-bed reaction and swing-batch reaction systems can be used efficiently for the catalysts evaluation. The results from a fixed-bed reaction showed that Cat-2 catalyst was more active than both Cat-1 and Cat-3, while the hydrodesulfurization (HDS) activity of Cat-3 catalyst was slightly better than that of Cat-1 and Cat-2. In the swing-batch reaction, Cat-1 and Cat-2 showed higher activity as compared to Cat-3 and Cat-4 catalysts. NiW loaded catalysts were found more active than NiMo loaded catalysts. HDS and cracking activities in the swing-batch reactor were found lower as compared to the fixed-bed reactor, probably due to recombination reactions involving sulfur and other cracked molecules.