Model Cu/ZnO catalysts for methanol synthesis: The role of surface structure: Progress report
Catalysts based on CuO/ZnO mixtures are well known for their activity and selectivity in the methanol synthesis reaction (CO + 2H/sub 2/ ..-->.. CH/sub 3/OH). These catalysts are also widely used for water-gas shift (CO + H/sub 2/O /l reversible/ CO/sub 2/ + H/sub 2/), which occurs together with methanol synthesis under most conditions. We are attempting to correlate reaction kinetics made at medium-pressure conditions (<10 atm.) on well-defined single-crystal surfaces with: (1) kinetics at similar conditions on high surface area Cu/ZnO catalysts, (2) details of the atomic-level surface structure, and (3) information on adsorption/desorption phenomena available from UHV surface science studies. Model catalysts were constructed based on single crystals where the surface structure is very homogeneous and well characterized using UHV surface analysis. Catalysts include ZnO(0001), Cu(111) and (110), sub-monolayer Cu overlayers on ZnO(000/bar 1/), ZnO/sub x/ overlayers on Cu surfaces, and Cs overlayers on Cu surfaces. To better understand the mechanism of promotion, we have experimentally studied the interactions of CO, CO/sub 2/, H/sub 2/O and formic acid with the clean and cesium-doped Cu(110) surface, and the coadsorption of H/sub 2/O and oxygen on that surface.
- Research Organization:
- Indiana Univ., Bloomington (USA). Dept. of Chemistry
- DOE Contract Number:
- FG02-86ER13625
- OSTI ID:
- 6664280
- Report Number(s):
- DOE/ER/13625-T2; ON: DE89003064
- Country of Publication:
- United States
- Language:
- English
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Model Cu/ZnO catalysts for methanol synthesis: The role of surface structure: Progress report
Related Subjects
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
ALCOHOLS
ALKALI METALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CESIUM
CHALCOGENIDES
COPPER
CRYSTALS
DOCUMENT TYPES
ELEMENTS
FORMIC ACID
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
KINETICS
METALS
METHANOL
MONOCARBOXYLIC ACIDS
MONOCRYSTALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROGRESS REPORT
REACTION KINETICS
SORPTION
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS
WATER
ZINC COMPOUNDS
ZINC OXIDES