Chemical modification of chemisorptive and catalytic properties of nickel
Several reactions representing important categories of catalytic systems have been studied on chemically modified single crystal surfaces: methanation of CO and CO/sub 2/, hydrogenolysis of ethane, hydrogenation of ethylene and cyclopropane ring-opening and hydrogenolysis. Poisoning of the above reactions by ordered, submonolayer coverages of sulfur show large nonlinear effects for sulfur coverages versus reactivity attenuation. These data together with related chemisorption results are reviewed with emphasis on the methanation reaction. Related studies have addressed the role of potassium promoters in nickel catalysts for methanation. Potassium decreases the rate of methane formation and increases the rate of higher hydrocarbons relative to the clean nickel surface. Similar results have been reported for supported nickel catalysts suggesting that support effects play a small role in catalytic promotion by potassium.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5507609
- Report Number(s):
- SAND-83-1693C; CONF-831174-6; ON: DE84002046
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
METALS
METHANATION
NICKEL
NONMETALS
POTASSIUM
PROMOTERS
SEPARATION PROCESSES
SORPTION
SULFUR
TRANSITION ELEMENTS