Surface and reaction studies of the sulfur poisoning of transition metal methanation catalysts

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1979

OSTI ID:6320345

Agrawal, P K

Surface and reaction studies of the sulfur poisoning of transition metal methanation catalysts (cobalt, iron, and ruthenium or alumina) at 200/sup 0/-400/sup 0/C, 1 atm, 0-16% carbon monoxide in hydrogen, and 0-100 ppb hydrogen sulfide showed that the catalysts underwent more than 1000-fold reduction in methanation activity in the presence of 13 ppb hydrogen sulfide. The sulfur-poisoning was due primarily to geometric blockage of the surface sites. Cobalt and iron underwent more than 100-fold deactivation due to bulk carburization of the metal and formation of multilayer graphitic deposits on the surface. The activation energy for methanation on ruthenium was independent of sulfur and carbon deactivation, indicating the absence of electronic effects which are induced by bulk carburization of cobalt and iron and by formation of a surface sulfide layer. Carbon and sulfur appeared to cause similar electronic changes in the metal surfaces as indicated by the kinetic behavior in methanation.

• OSTI ID: 6320345
• Country of Publication: United States
• Language: English

Related Subjects

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ACTIVATION ENERGY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CARBURIZATION
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COBALT
COMPARATIVE EVALUATIONS
DATA
DEACTIVATION
DEPOSITION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HARDENING
INFORMATION
IRON
KINETICS
METALS
METHANATION
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POISONING
REACTION KINETICS
RUTHENIUM
SULFUR
SURFACE HARDENING
SURFACE PROPERTIES
SURFACE TREATMENTS
TRANSITION ELEMENTS