Direct alcohol synthesis using modified cobalt catalysts
We have investigated factors affecting methanol and higher alcohol synthesis using mixed copper/cobalt based catalysts. We studied coprecipitated Cu/Co/Zn/Al/K catalysts in our preliminary studies. We prepared mixed oxide precursors and Cu/Co/Cr/K catalysts by the complexation method. We studied the effects of CO{sub 2}/CO and H{sub 2}/CO ratios and catalyst composition on the activities and the alcohol selectivities of Cu/Co/Cr/K catalysts. CO{sub 2} in the feed gas inhibited activity and alcohol selectivity of unpromoted Cu/Cr and Cu/Co/Cr catalysts but did not affect the hydrocarbon yield. Decreasing H{sub 2}CO ratio decreased the activity of unpromoted Cu/Cr and Cu/Co/Cr catalysts but increased the alcohol yield of Cu/Co/Cr catalysts. Feed gas composition had little effect on the activity and selectivity of Cu/Cr/K catalyst. Increasing the Co content in the catalyst resulted in a decrease in catalyst activity and alcohol selectivity and an increase in hydrocarbon selectivity. K inhibited the activity and alcohol selectivity of Cu/Cr catalysts in the presence of a CO{sub 2}-free feed gas whereas K promoted the alcohol selectivity of Cu/Co/Cr catalysts. We developed an oxide coverage model to account for the effect of K and CO{sub 2} on the methanol synthesis rate. We proposed a unified model for active sites in Cu/Co/Cr/K catalysts. 58 refs.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (USA). Dept. of Chemical Engineering
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG05-87ER13814
- OSTI ID:
- 6731397
- Report Number(s):
- DOE/ER/13814-2; ON: DE90014626
- Country of Publication:
- United States
- Language:
- English
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ALCOHOLS
ALKALI METALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHROMIUM
COBALT
COPPER
DOCUMENT TYPES
ELEMENTS
HYDROXY COMPOUNDS
METALS
METHANOL
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM
PROGRESS REPORT
SPECIFICITY
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENTS