Abstract
The long-term aging tests involving hydrodesulfurization catalysts were done at 380°C. The used catalysts were then characterized to investigate the deactivation mechanism. The amount of coke on the catalyst peaked around 30 days, and then decreased. This decrease in coke was due to the hydrogenation reaction with Ni-sulfide deposited on the catalyst. Elemental analysis, measurement of pore size distribution, and activity tests of the used catalysts revealed that the catalyst deactivation at start and middle of a run (MOR) was caused by coke and by metal deposits, respectively. In addition, calculations revealed plugging of pore mouths and the presence of sealed space of pores at MOR, resulting in the catalyst deactivation.
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