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Single-step Conversion of Methyl Ethyl Ketone to Olefins over ZnxZryOz Catalysts in Water

Journal Article · · ChemCatChem

In this study we investigated the conversion of aqueous methyl-ethyl-ketone (MEK) to olefin fuel precursors over ZnxZryOz mixed oxide catalysts. Experiments were carried out in water as MEK is intended to be produced from the dehydration of 2,3-butanediol in fermentation broth which is highly diluted in water. We demonstrated that ZnxZryOz catalysts are highly effective for converting aqueous MEK to C4-C5 olefins. High selectivity to olefins equal to 85% was reached at 92% per pass conversion when under H2 atmosphere. Catalyst stability was demonstrated for 60 hours' time on stream, highlighting the potential for upgrading 2,3-butanediol contained in fermentation broth without the need for energy-intensive water separation. Increased concentration of MEK in the aqueous feed results in increased activity towards olefin production. However, water inhibits catalyst deactivation from coking. A mechanistic investigation revealed the impact of the reaction environment (inert or reducing atmosphere) on the reaction pathways. In an inert environment, the mechanism involves consecutive aldol condensation of MEK and 3-pentanone intermediate. Under reducing conditions two reaction pathways compete with each other as MEK hydrogenation to butenes occurs concurrently with the aldol condensation/decomposition.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830; AC36-08GO28308
OSTI ID:
1544529
Alternate ID(s):
OSTI ID: 1633401
Report Number(s):
NREL/JA--5100-73271
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 15 Vol. 11; ISSN 1867-3880
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Cleanup and Conversion of Biomass Liquefaction Aqueous Phase to C3–C5 Olefins over ZnxZryOz Catalyst journal November 2019