Thermodynamics of sulfur chemisorption on metals. II. Alumina-supported ruthenium

Journal Article · Fri May 15 04:00:00 EDT 1981 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.440905· OSTI ID:6582361

McCarty, J G; Wise, H

Isosteric heats of chemisorption of sulfur on alumina-supported ruthenium have been determined by measuring the equilibrium ratio of H/sub 2/S/H/sub 2/ in contact with the solid in a closed gas-recirculation system. At low coverage the heat of chemisorption with respect to 1/2 S/sub 2/(g) was found to be -215 +- 15 kJ mol/sup -1/. With increasing coverage it decreased to -174 +- 10 kJ mol/sup -1/, a value comparable to the heat of formation of bulk ruthenium sulfide. For equal coverage with sulfur, the thermodynamic chemical potential of alumina-supported ruthenium exceeds that of alumina-supported nickel by approximately one order of magnitude. The binding strength of adsorbed sulfur is 432 +- 15 kJ mol/sup -1/ for Ru and 464 +- 15 kJ mol/sup -1/ for Ni.

• Research Organization: Solid State Catalysis Laboratory, SRI International, Menlo Park, California 94025
• OSTI ID: 6582361
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
ENTHALPY
EQUILIBRIUM
FORMATION HEAT
METALS
NONMETALS
PHYSICAL PROPERTIES
PLATINUM METALS
REACTION HEAT
REFRACTORY METALS
RUTHENIUM
RUTHENIUM COMPOUNDS
RUTHENIUM SULFIDES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SULFIDES
SULFUR
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS