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Deactivation of hydrodesulfurization catalysts by metals deposition

โœ Scribed by Bum-Jong Ahn; J. M. Smith

Publisher
American Institute of Chemical Engineers
Year
1984
Tongue
English
Weight
828 KB
Volume
30
Category
Article
ISSN
0001-1541

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โœฆ Synopsis

Primary causes of deactivation of hydrodesulfurization catalysts are partial poisoning of the interior pore surface and pore-mouth plugging by deposition of metals from organo-metallic compounds in the reactor feed. A model is developed to account for both causes of deactivation. It can be used to predict which occurs first: complete surface poisoning or pore-mouth plugging. Equations are formulated for catalyst activity as a function of time for demetallization and also for desulfurization. The results depend upon particle geometry and geometry of deposited species, Thiele moduli for demetallization and desulfurization, and relative rates of desulfurization on fresh and partially poisoned catalytic surfaces. The treatment is for a single, isothermal catalyst particle.

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