Surface science studies of catalyzed methanol synthesis on model copper and Cu-Zn-O surfaces

Technical Report · Sat Jun 01 00:00:00 EDT 1991

OSTI ID:5478711

Fu, Sabrina Su-Bin ^[1]

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1. California Univ., Berkeley, CA (United States). Dept. of Chemistry Lawrence Berkeley Lab., CA (United States)

Cu-Zn-O surfaces that are catalysts for methanol synthesis from CO, CO{sub 2}, and H{sub 2} modeled using zinc oxide overlayers on copper single crystals. These studies were performed in ultra-high vacuum (UHV) utilizing Temperature Programmed Desorption, Auger Electron Spectroscopy, and Low Energy Electron Diffraction techniques. The chemisorption of O{sub 2}, CO, CO{sub 2}, and D{sub 2} were compared on a stepped on Cu(311), and a flat Cu(110). At low pressures ({approximately}10{sup {minus}6} Torr), Cu(311) was found to be much more reactive than Cu(110) for the dissociative adsorption of CO{sub 2} and D{sub 2}, and the formation of CO{sub 2} from surface oxygen and CO. Since these reactions are important in methanol synthesis, these results suggest that methanol synthesis over copper may be a structure sensitive reaction. The interaction of copper, zinc, and oxygen were examined by the deposition of submonolayers to multilayers of zinc and oxygen in UHV on Cu(110). The interaction of methanol with these model Cu-Zn-O surfaces was also studied. Oxygen was adsorbed onto these exposed copper part of the surface to form ZnO{sub x}/y ML O/Cu(110) surfaces. The roles of ZnO{sub x} islands and chemisorbed oxygen on copper were investigated by monitoring methanol decomposition, into surface formate and methoxy species, on these ZnO{sub x}/y ML O/Cu(11) surfaces.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5478711
• Report Number(s): LBL-30795; ON: DE91016425
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
36 MATERIALS SCIENCE
COPPER
CATALYTIC EFFECTS
METHANOL
SYNTHESIS
AUGER ELECTRON SPECTROSCOPY
CHEMISORPTION
COPPER OXIDES
ELECTRON DIFFRACTION
ZINC OXIDES
ALCOHOLS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROXY COMPOUNDS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC COMPOUNDS
400201* - Chemical & Physicochemical Properties
100200 - Synthetic Fuels- Production- (1990-)
360102 - Metals & Alloys- Structure & Phase Studies