Fundamental study of catalysts using laser Raman, infrared, Auger electron spectroscopy and low energy electron diffraction. Progress report. [Carbon monoxide methanation with nickel catalyst]

Technical Report · Sun Mar 01 04:00:00 EST 1981

OSTI ID:6518338

Sargent, G A; Bradley, E B

The fundamantal goal of this project is to develop an understanding of catalytic activity and selectivity with the long-range goal of producing better catalysts. The techniques of LEED, Auger spectroscopy, and laser Raman and infared spectroscopies are being used to study the surface structure and obnding of CO, CH/sub 4/, H/sub 2/ and O/sub 2/ adsorbed on Ni(111) and Ni(100) single crystal surfaces. The surface coverage is controlled by varying the gas pressure and exposure time. Surface dipoles (magitude and orientation) are being measured for spectroscopic techniques. Laser Raman and infrared spectroscopy are used to determine vibrational modes of surface structures of the adsorbed molecules and the polarization of Raman bands and changes in band intensities are used to determine electric dipole orientation and thermal desorption characteristics. Thermal desorption experiments have been undertaken for each gas absorbed on each surface using the linear temperature programming technique. The mass of the desorbed species is determined by means of a precision mass analyzer. The mass analyzer is also used to determine residual gas concentrations in the experimental chamber and to identify the structure of intermediate molecules. A new theory has been developed to explain enhanced Raman scatteirng from surface adsorbed species. The theory explains, with good agrement, the Raman scattered intensities observed from molecules adsorbed on smooth and rough surfaces.

• Research Organization: Kentucky Univ., Lexington (USA). Coll. of Engineering
• DOE Contract Number: AS05-79ER10447
• OSTI ID: 6518338
• Report Number(s): DOE/ER/10447-1; ON: DE83005701
• Country of Publication: United States
• Language: English

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ADSORPTION
ALKANES
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DESORPTION
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
HYDROGEN
INFRARED SPECTRA
LASERS
METALS
METHANATION
METHANE
NICKEL
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RAMAN SPECTRA
RESEARCH PROGRAMS
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS