Deactivation of alumina-supported nickel and ruthenium catalysts by sulfur compounds

Journal Article · Mon Dec 31 23:00:00 EST 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90359-0· OSTI ID:5428818

Wentrcek, P W; McCarty, J G; Ablow, C M; Wise, H

The kinetics of sulfur deactivation of alumina-supported nickel and ruthenium catalysts are examined under methanation conditions in the presence of low concentration of H/sub 2/S (<10 ppM) added to the feed stream (H/sub 2//CO = 4/1). Based on a theoretical analysis of catalyst deactivation by irreversibly adsorbed surface sulfur atoms, we calculate the deactivation rate constants for the poisoning process. The Ru/Al/sub 2/O/sub 3/ catalyst exhibits a higher poisoning rate constant than Ni/Al/sub 2/O/sub 3/. The catalytic properties of Ni/Al/sub 2/O/sub 3/ are greatly modified by the addition of low concentrations of Ir. The Ni/Ir/Al/sub 2/O/sub 3/ catalyst exhibits higher methanation activity and greater resistance to sulfur deactivation. Temperature-programmed desorption and surface reaction studies indicate the formation of new binding states for CO adspecies on the surface of the Ni/Ir catalyst. Surface composition measurements by means of Auger electron spectroscopy demonstrate considerable Ir enrichment on the surface of the Ni/Ir/Al/sub 2/O/sub 3/ catalyst. 22 references, 6 figures, 6 tables.

• Research Organization: Solid State Catalysis Lab., Menlo Park, CA
• OSTI ID: 5428818
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 61:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
400301 -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
CRYOGENIC FLUIDS
DATA
DATA FORMS
DEACTIVATION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GAS CHROMATOGRAPHY
GASES
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
IRIDIUM
ISOLATED VALUES
KINETICS
MECHANICAL STRUCTURES
METALS
METHANE
NICKEL
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
REFRACTORY METALS
RUTHENIUM
SEPARATION PROCESSES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SUPPORTS
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
YIELDS