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

Journal Article · Tue Jan 01 00:00:00 EST 1980 · 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), Vol. 61:1
• Country of Publication: United States
• Language: English

Related Subjects

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