Catalytic conversion of alcohols--13. Alkene selectivity with TiO/sub 2/ catalysts
- Univ. Louisville, Ky.
In conversion of secondary alcohols at 200/sup 0/-265/sup 0/C, the anatase form of Ti0/sub 2/, both air- and hydrogen-pretreated, showed up to 99Vertical Bar3< selectivity for dehydration to alkenes, and the alkene isomer distributions resembled those observed over alumina catalysts, e.g., approx. 41-52Vertical Bar3< of the cis-2 isomer from 2-pentanol and 57-66Vertical Bar3< from 4-methyl-2-pentanol, but only 7-9Vertical Bar3< from 4,4-dimethyl-2-pentanol (DMP), which yielded 56-60Vertical Bar3< of 1-octene. The cis/trans 2-alkene ratio was 0.28:1 for DMP vs. 2:1 and more for 2-pentanol or 2-octanol. Anatase was also a selective catalyst for dehydration of 2-methylcyclohexanol, especially in the conversion of the pure cis-alcohol, but did not catalyze the cis-trans isomerization, suggesting an anti-elimination mechanism. For the conversion of alcohols, anatase resembled hafnia but differed markedly from zirconia and thoria. The rutile form of TiO/sub 2/, particularly when hydrogen-pretreated, was considerably more active for dehydrogenation than for dehydration of 2-octanol, and was more selective for 1-alkenes than anatase.
- OSTI ID:
- 6821370
- Journal Information:
- Ind. Eng. Chem., Prod. Res. Dev.; (United States), Vol. 18:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALCOHOLS
CONVERSION
CATALYSTS
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
ALKENES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
EXPERIMENTAL DATA
TITANIUM OXIDES
CHALCOGENIDES
DATA
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YIELDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400201 - Chemical & Physicochemical Properties