Effects of promoters on sulfide catalysts

Thesis/Dissertation · Fri Jan 01 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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