Effective Diffusivity Measurement in Coke-Deactivated Hydrotreating Catalyst
AIChE Member Credits 0.5 AIChE Members $15.00 AIChE Fuels and Petrochemicals Division Members Free AIChE Graduate Student Members Free AIChE Undergraduate Student Members Free Non-Members $25.00
- Type: Conference Presentation
- Conference Type: AIChE Spring Meeting and Global Congress on Process Safety
- Presentation Date: March 21, 2010
- Duration: 30 minutes
- Skill Level: Intermediate
- PDHs: 0.50
The effective diffusivity of two fresh and two spent catalysts, previously deactivated for 18 months in a commercial unit, were determined. The effective diffusivities were measured using a shallow-bed reactor already developed for this purpose. Nitrogen, isopentane and isooctane effective diffusivity and adsorption coefficients were measured at different temperatures. The catalysts were a NiMo/AlMCM-41 with different pores interconnections. The catalysts were also characterized by chemical analysis, TEM, adsorption desorption of iC5 and iiC8 and chemical reaction with model molecules. The results demonstrated that some areas of the porous networks were blocked by local coke depositions that reduce more the access of iC5 and iiC8 than nitrogen molecules. The catalyst with better pore network interconnections had lower deactivation.
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|AIChE Member Credits||0.5|
|AIChE Fuels and Petrochemicals Division Members||Free|
|AIChE Graduate Student Members||Free|
|AIChE Undergraduate Student Members||Free|