Chemisorption of hydrogen sulfide on nickel and ruthenium catalysts-1. Desorption isotherms

Journal Article · Wed Feb 01 04:00:00 EST 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90297-X· OSTI ID:5782480

Oliphant, J L; Fowler, R W; Pannell, R B; Bartholomew, C H

Hydrogen adsorption isotherms at 25/sup 0/C, saturation sulfur uptake at 450/sup 0/C, and sulfur desorption into H/sub 2//H/sub 2/S at 450/sup 0/C were determined for the methanation catalysts alumina-supported 3% Ni, 10% Ni/10% Co, 16% Ni/0.5% Pt, and 0.5% Ru, and for unsupported Ni and Al/sub 2/O/sub 3/. The elution curves at 450/sup 0/C (and for Ni/Pt also at 520/sup 0/C) were measured as a function of 0.1-30 ppm H/sub 2/S in the hydrogen stream and of hydrogen flow rate, and the results transformed into H/sub 2/S desorption isotherms. The desorption isotherms followed a Langmuir equation. The heat of H/sub 2/S chemisorption on Ni/Pt was derived as 38 kcal/mole. The H/sub 2/S heat of adsorption on Ni was estimated as 30-40 kcal/mole at 50-90% coverage. An analysis of the results showed that H/sub 2/S chemisorption on Ni and Ru was very strong and that it was stronger on unsupported than supported nickel; that saturation coverage was lower on nickel alloys than on nickel and much lower on supported ruthenium than on nickel; and that H/sub 2/S adsorbed on nickel at 450/sup 0/C dissociatively up to monolayer coverage and molecularly at higher coverage and desorbed in the presence of 25-30 ppm H/sub 2/S to leave an Ni-S stoichiometric surface and in the presence of 8-12 ppm H/sub 2/S to form an Ni/sub 3/S/sub 2/ surface. Graphs, tables, and 31 references.

• Research Organization: Brigham Young Univ., Provo, Utah
• OSTI ID: 5782480
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 51:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COBALT
DESORPTION
ELEMENTS
GASIFICATION
HIGH TEMPERATURE
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IONIZATION
ISOTHERM
MEDIUM TEMPERATURE
METALS
METHANATION
NICKEL
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SULFIDES
SULFUR
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS