High octane ethers from synthesis gas-derived alcohols
Catalytic testing of inorganic catalysts was continued with the highly active sulfate-modified zirconia catalyst prepared here. Using isobutanol as the only reactant over this catalyst, it was demonstrated that high conversion and selectivity to isobutene was achieved at 175[degrees]C. In addition, the high selectivity to isobutene, i.e. 79--86 mol%, was maintained at higher space velocities and higher temperatures. A high productivity of 11.35 mol isobutene was achieved at 225[degrees]C. Utilizing a methanol/isobutanol = 2/1 molar ratio reactant mixture over the ZrO[sub 2]/SO[sub 4][sup 2[minus]] catalyst, it was shown by a contact time study that the reaction conditions employed here fall in the differential reaction regime. It was found that the isobutene selectivity among the butenes produced hardly varied at a function of contact time and conversion level of isobutanol. Also indicating that the linear 2-butenes are primary products. A separate study showed that the yield of dimethylether increased as the pressure of methanol by itself was increased over the ZrO[sub 2]/SO[sub 4][sup 2[minus]] catalyst, and these yields were higher than those in the presence of isobutanol. A new supported heteropolyacid catalyst was prepared by supporting phosphotungstic acid (H[sub 3]PW[sub 12]O[sub 40]) on silica gel to the level of 20 wt%. It was shown that the same activities and selectivity patterns were obtained from methanol/isobutanol = 1/1 reactants whether the catalysts were calcined at 100[degrees]C or 200[degrees]C. It was shown that the activity and selectivity of these catalysts toward isobutene were increased by increasing the reaction temperature. However, under the set of reaction conditions employed, these catalysts were not better than the ZrO[sub 2]/SO[sub 4][sup 2[minus]] catalyst.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-90PC90044
- OSTI ID:
- 6873548
- Report Number(s):
- DOE/PC/90044-8; ON: DE93006476
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BUTANOLS
DEHYDRATION
ETHERS
CHEMICAL PREPARATION
SYNTHESIS GAS
CONVERSION
TUNGSTOPHOSPHORIC ACID
CATALYTIC EFFECTS
ZEOLITES
ALKENES
CATALYST SUPPORTS
PROGRESS REPORT
TEMPERATURE DEPENDENCE
YIELDS
ALCOHOLS
DOCUMENT TYPES
FLUIDS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SILICATE MINERALS
SYNTHESIS
100200* - Synthetic Fuels- Production- (1990-)