Mixed Oxide Supports Derived From Layered Metal Hydroxides to Reduce Methanol Selectivity In the Catalytic Synthesis of Higher Alcohols Over Potassium-Promoted Molybdenum Sulfide Catalysts

Tuesday, October 18, 2011: 1:50 PM
200 J (Minneapolis Convention Center)
Michael R. Morrill1, Nguyen Tein Thao1, Christopher W. Jones2, Pradeep K. Agrawal2, David J. Barton3, Daniela Ferrari4, Robert J. Davis5 and Heng Shou5, (1)Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, (2)School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, (3)Dow Chemical Company, Midland, MI, (4)Dow Benelux B.V., Terneuzen, Netherlands, (5)Chemical Engineering, University of Virginia, Charlottesville, VA

Molybdenum sulfide, a well-known hydrodesulphurization catalyst, is being increasingly investigated as a catalyst for conversion of synthesis gas to higher alcohols. Here it is demonstrated that potassium promoted MoS2 catalysts supported on basic, mixed metal oxides derived from decomposed, synthetic hydrotalcites convert syngas into higher alcohols with reduced methanol and increased n-propanol selectivity relative to bulk molybdenum sulfide or conventionally supported molybdenum sulfide catalysts (activated carbon, basic sepiolite clay, or alumina). This advantage may be attributed to the basic, mesoporous nature of the mixed metal oxide support.  X-ray absorption spectroscopy shows that before sulfidation, the molybdenum oxide domains on the supported catalyst are highly dispersed. Treatment of this oxide catalyst at 723 K in 20% hydrogen sulfide in hydrogen results in the formation of molybdenum sulfide moieties that in turn provide a favorable environment for higher alcohol formation.

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See more of this Session: CO Hydrogenation I
See more of this Group/Topical: Catalysis and Reaction Engineering Division