ABE Condensation over Monometallic Catalysts: Catalyst Characterization and Kinetics

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Date

2017-02-01

Author

GOULAS, Konstantinos A.
Günbaş, Emrullah Görkem
DİETRİCH, Paul J.
SREEKUMAR, Sanil
GRİPPO, Adam
CHEN, Justin P.
GOKHALE, Amit A.
TOSTE, F. Dean

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Herein, we present work on the catalyst development and the kinetics of acetone-butanol-ethanol (ABE) condensation. After examining multiple combinations of metal and basic catalysts reported in the literature, Cu supported on calcined hydrotalcites (HT) was found to be the optimal catalyst for the ABE condensation. This catalyst gave a six-fold increase in reaction rates over previously reported catalysts. Kinetic analysis of the reaction over CuHT and HT revealed that the rate-determining step is the C-H bond activation of alkoxides that are formed from alcohols on the Cu surface. This step is followed by the addition of the resulting aldehydes to an acetone enolate formed by deprotonation of the acetone over basic sites on the HT surface. The presence of alcohols reduces aldol condensation rates, as a result of the coverage of catalytic sites by alkoxides.

Subject Keywords

ABE, Aldol condensation, Copper, Hydrotalcite, Kinetic isotope effect

URI

https://hdl.handle.net/11511/37516

Journal

CHEMCATCHEM

DOI

https://doi.org/10.1002/cctc.201601507

Collections

Department of Chemistry, Article

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Citation Formats

K. A. GOULAS et al., “ABE Condensation over Monometallic Catalysts: Catalyst Characterization and Kinetics,” CHEMCATCHEM, pp. 677–684, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37516.