Effects of promoters on sulfide catalysts

Thesis/Dissertation · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5574464

Keeler, K M

The effects of cobalt oxide, potassium carbonate, and praseodymia on sulfided molybdena/alumina were studied. The prepared catalysts were characterized by water-gas shift activity, surface area,and oxygen chemisorption measurements. The catalysts were studied after presulfiding at 300C or 400 C. The combination of 15 wt.% potassium carbonate, 2.6 wt.% cobalt oxide and 12.4 wt.% molybdena supported on alumina was found to have very high activity for the water-gas shift reaction. Oxygen chemisorption increased with increasing presulfiding temperature. The oxygen chemisorption on molybdena/alumina was very low, 0.22 scc (O{sub 2})/gm. The addition of either cobalt oxide or 15 wt.% potassium carbonate was found to double the oxygen chemisorption. Detailed kinetic studies were performed and reaction rate laws (power rate laws) were determined for the water-gas shift reaction for molybdena/alumina, cobalt oxide/molybdena/alumina, and potassium carbonate/cobalt oxide/molybdena/alumina. The apparent activation energies ranged from 15 to 17 kcal/mole. Two commercial cobalt molybdate catalysts (Amocat 1A and Houdry Series C) were studied for use as water-gas shift catalysts. Activity, surface area, and oxygen chemisorption measurements were performed on the catalysts. Amocat 1A exhibited deactivation while the Houdry Series C did not. A correlation between catalyst deactivation and oxygen chemisorption was observed. At atmospheric pressure, the kinetics of the Houndry Series C catalyst was found to adequately fit a rate law developed using Amocat 1A at high pressure. The apparent activation energy was 9.8 kcal/mole.

• Research Organization: State Univ. of New York, Buffalo, NY (USA)
• OSTI ID: 5574464
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL GASIFICATION
CATALYSIS
COBALT OXIDES
CATALYTIC EFFECTS
POTASSIUM CARBONATES
PRASEODYMIUM OXIDES
ACTIVATION ENERGY
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMISORPTION
DEACTIVATION
KINETIC EQUATIONS
MOLYBDENUM OXIDES
OXYGEN
PROMOTERS
SHIFT PROCESSES
SULFIDATION
SURFACE AREA
WATER GAS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
ELEMENTS
ENERGY
EQUATIONS
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
INTERMEDIATE BTU GAS
KINETICS
MOLYBDENUM COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010404* - Coal
Lignite
& Peat- Gasification