Kinetic studies of the water gas shift reaction on a sulfided cobalt/molybdena/alumina catalyst
In this study, the applicability of low temperature oxygen chemisorption (LTOC) to measure the specific surface area of several rare-earth oxides (La, Ce, Pr, Nd, Tb) and the kinetics of the water-gas shift reaction over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst are investigated. The LTOC results indicate that oxygen is possibly adsorbed in the molecular form, O/sub 2//sup -/, as observed by others after heat treatment of these oxides in vacuum. Lanthana and ceria were found to have ratios of total surface area to LTOC similar to those of chromia and molybdena respectively, after a comparable pretreatment. Furthermore, ceria is deduced to exist as a monolayer on the alumina support at loadings below 12%. An additional hour of reduction after the 6 hours of reduction shows a significant increase in LTOC on lanthana, neodymia and terbia which may be due to phase changes exhibited by these polymorphic oxides. The kinetics of the water-gas shift reaction has been extensively studied on iron oxide (high temperature shift) and copper oxide (low temperature shift) based catalysts. This investigation establishes the kinetics over a sulfided cobalt-molybdena-alumina (AMOCAT 1A) catalyst in the medium temperature shift range, 250-300/sup 0/C. The catalyst was sulfided in-situ in a high pressure integrated Berty reactor system. Reaction rates were measured for different CO/H/sub 2/O feed ratios in the range 0.3-3.0, with and without CO/sub 2/ in the feed. The reaction was carried out at several pressures in the range 5-27 atm. and GHSV's in the range 4800-2400 hr/sup 1/.
- Research Organization:
- State Univ. of New York, Buffalo (USA)
- OSTI ID:
- 7019276
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERIUM OXIDES
SURFACE AREA
LANTHANUM OXIDES
NEODYMIUM OXIDES
PRASEODYMIUM OXIDES
SHIFT PROCESSES
CHEMICAL REACTION KINETICS
TERBIUM OXIDES
ALUMINIUM OXIDES
CARBON DIOXIDE
CARBON MONOXIDE
CATALYSTS
CATALYTIC EFFECTS
CHEMISORPTION
COBALT SULFIDES
MOLYBDENUM OXIDES
OXYGEN
WATER
WATER GAS
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
ELEMENTS
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROGEN COMPOUNDS
INTERMEDIATE BTU GAS
KINETICS
LANTHANUM COMPOUNDS
MOLYBDENUM COMPOUNDS
NEODYMIUM COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
TERBIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)