Surface structure and mechanisms of gasification catalyst deactivation. Quarterly report, May 1--July 31, 1978

Technical Report · Fri Sep 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6173287· OSTI ID:6173287

Reucroft, P. J.; Bradley, E. B.; De Angelis, R. J.; Sargent, G. A.

Laser spectral studies of the adsorption of CO/sub 2/, O/sub 2/, H/sub 2/ and D/sub 2/ on Ni(111) are discussed in relation to graphitic adlayers and Ni surface states. No definite conclusion is made on which of these mechanisms would produce the dispersion in ..delta nu.. that is observed with variation in excitation frequency. It is believed that future laser spectral studies of Ni(110) and Ni(100) will help clarify the Ni(111) data. The adsorption cell which will be used during infrared reflection studies of adsorbed gases on Ni(111) is described. Criteria for its design are presented which indicate that the infrared cell should maximize spectral response while minimizing scattering losses. An upgrading of the capabilities of the ESCA spectrometer is described. The modified analyzer scanning electronics provides a significantly improved count rate especially at lower energies. A separate sample preparation chamber has been installed and given preliminary testing. Analysis of the sulfided Ni-Cr/MgSi0/sub 3/ catalysts has continued. A simple model of the Ni/Al/sub 2/0/sub 3/ catalyst predicts a significantly larger decrease in the Ni to Al signal than is observed experimentally. The trends are correctly predicted. The model, however, appears to oversimplify the actual catalyst structure. Auger electron spectroscopy has been used as a technique to obtain adsorption isotherms for CO on a S poisoned Ni(111) single crystal surface.

• Research Organization: Kentucky Univ., Lexington (USA)
• OSTI ID: 6173287
• Report Number(s): FE-2229-10
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
BINDING ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
CRYOGENIC FLUIDS
DEUTERIUM
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
FLUIDS
GASIFICATION
HYDROGEN
HYDROGEN ISOTOPES
INFRARED SPECTRA
ISOTOPES
LIGHT NUCLEI
METALS
METHANATION
NICKEL
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POISONING
RAMAN SPECTRA
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS