Isobutanol-methanol mixtures from synthesis gas. Quarterly technical progress report, April 1, 1995--June 30, 1995
Three types of catalytic materials for alcohol coupling and isobutanol synthesis reactions have been prepared and characterized by BET surface area and x-ray diffraction methods. The materials consist of (1) modified low-temperature methanol synthesis catalysts and their constitutive components, (2) high temperature isobutanol synthesis catalysts consisting of Nb-Zn-Zr mixed oxides promoted with Cu, and (3) high surface area basic oxides prepared from hydrotalcite precursors and active in alcohol coupling reactions. Mechanistic and kinetic studies of methanol and ethanol coupling reactions using labeled compounds have shown that the reaction proceeds via an intermediate dehydrogenation reaction that form aldehydic intermediates. Ethanol is much more reactive than methanol because it forms a more thermodynamically stable acetaldehyde intermediate with kinetically available aldol condensation pathways for the formation of higher oxygenates. The presence of Cs in this catalysts decreases dehydrogenation rates but prevents the decomposition of methanol and ethanol to CO and H{sub 2}.
- Research Organization:
- Univ. of California, Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-94PC94066
- OSTI ID:
- 172086
- Report Number(s):
- DOE/PC/94066-T3; ON: DE96004237; TRN: 96:000986
- Resource Relation:
- Other Information: PBD: 24 Jul 1995
- Country of Publication:
- United States
- Language:
- English
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