Chemisorption of hydrogen sulfide on nickel and ruthenium catalysts. I. Desorption isotherms
Desorption isotherms for H/sub 2/S on unsupported nickel and alumina-supported nickel, nickel-platinum, nickel-cobalt, and ruthenium were calculated from elution curves of H/sub 2/S from a packed bed of each catalyst. All elution experiments were run initially at 450/sup 0/C and at H/sub 2/S concentrations in the exiting hydrogen stream from 30 to 0.1 ppM. Elution curves and isotherms for supported nickel-platinum were also obtained at 450 and 520/sup 0/C from which an estimate of the heat of H/sub 2/S chemisorption was calculated. The heat of H/sub 2/S adsorption on nickel is estimated to be 30--40 kcal/mole at 450/sup 0/C and high coverage (50--90%). The stoichiometry of sulfur adsorption was determined by comparing the total quantity of sulfur adsorbed at 450/sup 0/C with the corresponding quantity of hydrogen chemisorbed at 25/sup 0/C for each catalyst. The data suggest that H/sub 2/S chemisorption is strong and dissociative at low coverage and nondissociative at high coverages. Ruthenium apparently has a lower capacity for sulfur adsorption than nickel or nickel alloys.
- Research Organization:
- Brigham Young Univ., Provo, UT
- OSTI ID:
- 5222893
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 51:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
COBALT
DESORPTION
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
METALS
NICKEL
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REACTION KINETICS
REFRACTORY METALS
RUTHENIUM
SORPTION
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENTS