Effects of feed metals on catalyst aging in hydroprocessing residuum

Conference · Mon Jan 01 04:00:00 EST 1979 · 72nd AIChE Annu. Meet. Prepr.; (United States)

OSTI ID:6415610

Tamm, P W; Harnsberger, H F; Bridge, A G

Deposition patterns of nickel, vanadium, iron, and coke in 1/16 in. extrudate (unspecified) catalysts aged in hydrotreating pilot plants were examined by electron microprobe techniques. Iron deposited mostly on the outer catalyst surface; coke deposited in an outer annulus initially and then its levels in the catalyst interior increased linearly with time; and nickel and vanadium deposited in the interior in a manner consistent with diffusion-limited demetalation. With increasing temperature or hydrogen partial pressure, nickel and vanadium deposition occurred nearer the catalyst surface. The metals distribution in the catalyst varied with crude source. The metals diffused further into catalysts with larger pores. The distribution of deactivation processes in the catalyst bed suggested that poisoning of surface sites and pore plugging both take place and that the rate at which pore plugging moves through the bed depends on the extent of surface poisoning and on the axial distribution of the metal deposits along the reactor length. The tests were conducted with six feedstocks containing 1.7-4.3% sulfur, 29-630 ppm vanadium, 8-48 ppm nickel, and 3-15% iron.

• Research Organization: Chevron Res. Co.
• OSTI ID: 6415610
• Report Number(s): CONF-791108-
• Conference Information: Journal Name: 72nd AIChE Annu. Meet. Prepr.; (United States) Journal Volume: 23B
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
CATALYSTS
CHEMICAL ANALYSIS
COKE
DATA
DEACTIVATION
DEPOSITION
DIFFUSION
DISTRIBUTION
ELECTRON MICROPROBE ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
FUEL OILS
FUELS
FUNCTIONAL MODELS
INFORMATION
LIQUID FUELS
METALS
MICROANALYSIS
NUMERICAL DATA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PILOT PLANTS
POISONING
PROCESSING
REFINING
RESIDUAL FUELS
SURFACES