Catalytic synthesis of methanol from CO/H/sub 2/. I. Phase composition, electronic properties, and activity of the Cu/ZnO/M/sub 2/O/sub 3/ catalysts
- Lehigh Univ., Bethlehem, PA
The catalytic activity of the low pressure Cu/ZnO/Al/sub 2/O/sub 3/ or Cr/sub 2/O/sub 3/ catalysts for methanol synthesis resides in the Cu/ZnO system. No special pore distribution or presence of crystalline phases such as spinels is necessary for selectivity to methanol. The Cu/ZnO system stabilizes a black substance which has been identified as a Cu/sup I/ solution in ZnO. A synthesis mechanism is proposed whereby the Cu/sup I/ centers chemisorb and activate carbon monoxide and the ZnO surface activates hydrogen. Catalyst deactivation in the CO/H/sub 2/ mixture is explained as the reduction of Cu/sup I/ to inactive copper metal, and the promotion effect of O/sub 2/, H/sub 2/O, and CO/sub 2/ as a maintenance of oxidation potential high enough to keep the copper in the active Cu/sup I/ state. Poisoning by hydrogen sulfide and HCl is attributed to irreversible heteropolar chemisorption of H/sub 2/S and HCl with blocking of the Cu/sup I/ centers by the SH/sup -/ and Cl/sup -/ groups. 4 tables, 11 figs., 58 references.
- OSTI ID:
- 6715442
- Report Number(s):
- CONF-780305-P1
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Vol. 23:2; Conference: American Chemical Society conference, Anaheim, CA, USA, 12 Mar 1978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER ALLOYS
CATALYTIC EFFECTS
METHANOL
SYNTHESIS
ZINC OXIDES
ALUMINIUM OXIDES
CARBON DIOXIDE
CARBON MONOXIDE
CHEMICAL REACTION KINETICS
CHEMISORPTION
CHROMIUM OXIDES
HYDROGEN
SYNTHESIS GAS
ALCOHOLS
ALLOYS
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASES
HYDROXY COMPOUNDS
KINETICS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
090221* - Alcohol Fuels- Chemical Synthesis- (1976-1989)