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Auger and reaction studies of poisoning by sulfur and regeneration of metal synthesis gas catalysts. Progress report, December 8, 1975--December 8, 1976

Technical Report ·
DOI:https://doi.org/10.2172/7231676· OSTI ID:7231676
CO methanantion rates have been measured in the all-glass internal recycle reactor developed for this work. The methanation rate over the cylinder Ni film catalyst at 400/sup 0/C is 3.9 sec/sup -1/ initially, and the catalyst undergoes deactivation to a value of 1.8 sec/sup -1/, comparable with a reported value of 2.5 sec/sup -1/. The activation energy for Ni film on alumina is 24 kcal/mole, that for Ni film on silica is 17.8 kcal/mole comparable to values for Ni on these supports. The kinetics suggest that CO dissociation is rate limiting; carbon on the Ni is easily hydrogenated off. H/sub 2/S causes severe deactivation and regeneration after sulfur poisoning is not easily achieved by oxidation in the reactor. However, sulfur is easily removed from Ni by oxygen from a molecular leak in the high-vacuum chamber of the Auger electron spectrometer. Atmospheric pressure studies using an ante-chamber connected to the spectrometer chamber show that sulfur cannot be removed from Ni under conditions similar to those in the reactor because of rapid oxide growth which buries the sulfur preventing removal. Standards allowing determination of concentration as well as chemical state for Ni, O, S, and C have been developed.
Research Organization:
Delaware Univ., Newark (USA). Dept. of Chemical Engineering
OSTI ID:
7231676
Report Number(s):
COO-2579-2
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400300 -- Organic Chemistry-- (-1987)
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELECTRON SPECTROSCOPY
ELEMENTS
FLUIDS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
METALS
METHANATION
NICKEL
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POISONING
REACTION KINETICS
REGENERATION
REMOVAL
SPECTROSCOPY
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENTS