Catalyst deactivation due to pore-plugging by reaction products. [In hydrotreating of residuum oils]

Conference · Thu Jan 01 04:00:00 EST 1976 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:7269901

Newson, E

In trickle-bed hydrodesulfurization the gas and liquid phases pass concurrent downflow over a fixed bed of catalyst. The hydrotreating of residuum oils at elevated temperatures and pressures in this way has revealed the presence of (undesirable) demetallation reactions taking place in parallel with the desired desulfurization reactions. Organometallic constituents of the oil, primarily vanadium, nickel and iron, react out of the oil and combine with hydrogen sulfide to produce solid deposits of metal sulfides. The deposition of the reaction products occur both inter- and intra-particle. The intra-particle deposits decrease the effective diffusivity of the catalyst causing deactivation by a pore-plugging mechanism. A simple model is proposed to take into consideration catalyst deactivation in residuum hydrotreating by metal sulfides build-up within the pores of the catalyst. The effect of the metal sulfides are considered the dominant feature of the deactivation process based on recent evidence from the literature. The demetallation rates used in the model are typical of current commercial practice. Predictions for catalyst life are compared with commercial data.

• Research Organization: Technical Univ. of Denmark, Bygning
• OSTI ID: 7269901
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 17:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
DEACTIVATION
DECOMPOSITION
DEMETALLIZATION
DESULFURIZATION
ELEMENTS
FUEL OILS
FUELS
HYDROCRACKING
IRON
KINETICS
MATHEMATICAL MODELS
METALS
NICKEL
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PYROLYSIS
REACTION KINETICS
RESIDUAL FUELS
SEPARATION PROCESSES
TRANSITION ELEMENTS
VANADIUM