Sulfur poisoning of nickel methanation catalysts. I. In situ deactivation by H/sub 2/S of nickel and nickel bimetallics
The effects of exposure to dilute H/sub 2/S during reaction on the methanation activity of alumina-supported nickel, cobalt, and nickel bimetallic catalysts in powder, pellet, and monolith form were investigated. Results of activity tests at 525/sup 0/K, 1 atm, and a space velocity of 30,000 hr/sup -1/ with 10 ppM H/sub 2/S in the reactant stream show that cobalt and most nickel bimetallic catalysts are not significantly more or less sulfur tolerant than nickel; Ni-MoO/sub 3/, however, is more active before, during, and after exposure to H/sub 2/S. The data also indicate that monolithic catalysts are significantly more sulfur resistant than either powder or pellet catalysts. All of these catalysts, however, are completely deactivated within a period of 2 to 3 days under the conditions investigated. During reaction in the presence of H/sub 2/S, there is an exponential decrease in activity accompanied by a gradual breakthrough of the poison. Less sulfur is adsorbed on the catalyst during reaction than would be if equilibrium adsorption occurred. Data showing the roles of temperature, gas composition, and catalyst geometry in the poisoning process and the results of regeneration experiments are presented and discussed. 8 figures, 3 tables.
- Research Organization:
- Brigham Young Univ., Provo, Utah
- OSTI ID:
- 5561886
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 60:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Sulfur poisoning of nickel methanation catalysts
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
DATA
DATA FORMS
DEACTIVATION
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
ISOLATED VALUES
MECHANICAL STRUCTURES
MEDIUM PRESSURE
METALS
METHANATION
METHANE
MIXTURES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHOSPHORUS
PLATINUM
PLATINUM METALS
POWDERS
PRESSURE DEPENDENCE
REFRACTORY METALS
REGENERATION
RUTHENIUM
SULFIDES
SULFUR
SULFUR COMPOUNDS
SUPPORTS
SYNTHESIS
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS