Characterization of a catalyst regeneration process for metals fouled CoMo/Al/sub 2/O/sub 3/ catalysts

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5662519

Hiltzik, L H

The purpose of this research was to investigate a treatment process for regeneration of Ni and V fouled CoMo/Al/sub 2/O/sub 3/ hydrodesulfurization (HDS) catalysts. The treatment process consisted of combinations of calcination, sulfidation and ferric ion leach treatments. An essential feature of the process that improved the selective removal of foulant metals was the incorporation of a sulfidation pretreatment. Sulfidation both decreased Mo dissolution and increased the removal of nickel and vanadium. Between 10 and 20% of the original Mo and Al/sub 2/O/sub 3/ components, and 50 to 70% of the foulant metals were removed by the combined sulfidation/leach treatments. The thiophene HDS activity, 1-hexene hydrogenation activity and oxygen chemisorption properties of treated virgin catalyst were explained by morphology changes that occurred on the catalyst surface. Calcination decreased the population of HDS sites and increased the population of hydrogenation sites. Sulfidation/leach treatment had the opposite effect on active site populations. Results of studies of Ni and V impregnation on virgin catalysts indicated that Ni impregnation had no effect on HDS activity but that V had a profound effect. Two significant findings that resulted from a comparison of virgin catalyst and treated spent catalyst residual oil processing performance (1) the 50% recovery of HDS activity was measured by both intrinsic thiophene activity and residual oil processing tests and (2) the treated spent catalyst had substantial activity for residual oil demetallation.

• Research Organization: Georgia Inst. of Tech., Atlanta (USA)
• OSTI ID: 5662519
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
DESULFURIZATION
ELEMENTS
FOULING
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGENATION
METALS
MOLYBDENUM
NICKEL
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
THIOPHENE
TRANSITION ELEMENTS
VANADIUM