Investigation of the activity of composite catalyst beds for hydrotreatment of a coal-derived liquid

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5638427

Bhan, P K

A trickle-bed reactor system equipped with adequate temperature, pressure and flow controls was designed, constructed and operated for hydrotreatment of a coal-derived liquid. Two commercial Ni-Mo-Al/sub 2/O/sub 3/ catalysts of similar chemical but significantly different physical properties were used separately and in combination as composite catalyst beds. Four experimental runs were conducted using temperatures in the range of 260 to 400/sup 0/C, and liquid volume hourly space times in the range of 0.94 to 1.87 hours; hydrogen gas pressure and flow rate were held constant at 11.6 MPa and 1781 std.m/sup 3//m/sup 3/ of oil, respectively. The product liquid samples were analyzed for elemental nitrogen and hydrogen content; some selected liquid samples were subjected to 454 C/sup +/ distillation and solvent residue analysis. Both the small and the large pore catalysts lost significant hydrodenitrogenation activity over the 240 hours of oil-catalyst contact, the deactivation being severe during the first 12-36 hours. Small pore diameter catalyst (KF-153S) was observed to have consistently higher hydronitrogenation, 454 C/sup +/ distillation and solvent residue reduction activity. Under the conditions of this study, the composite catalyst bed combination of small and large pore diameter catalysts did not offer any significant advantage for hydrodenitrogenation and residue reduction of an SRC liquid over single catalyst beds. Optimum catalyst activity was predicted to occur for catalyst pore diameter five times the diameter of the diffusing molecule.

• Research Organization: Oklahoma State Univ., Stillwater (USA)
• OSTI ID: 5638427
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL LIQUIDS
COMPOSITE MATERIALS
CRACKING
DECOMPOSITION
FLUIDS
LIQUIDS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PROCESSING
PYROLYSIS
THERMOCHEMICAL PROCESSES