Abstract
The hydrodeoxygenation (HDO) of m-cresol is investigated as a model for the HDO of phenolic compounds from lignin pyrolysis. Pt catalysts supported on γ-Al2O3 and SiO2 are effective for the conversion of m-cresol to toluene and methylcyclohexane at 533 K and 0.5 atm H2. Experiments using Pt/γ-Al2O3 show that the reaction proceeds by a combination of Pt-catalyzed hydrogenation and acid-catalyzed dehydration reactions. Dehydration of a partially hydrogenated oxygenate intermediate is most likely the dominant reaction pathway to toluene. The acidity of the γ-Al2O3 support was modified by base (K2CO3) and acid (NH4F) treatments, and increasing the number and strength of acid sites was found to increase the rate of HDO. Pt/SiO2 was more active for m-cresol HDO than Pt/Al2O3. The reaction rate on Pt/Al2O3 and Pt/SiO2 decreased after 5 h on stream, but Pt/Al2O3 regained initial reactivity after reductive treatment in H2.
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Acknowledgments
The authors would like to thank A. Javadekar for his assistance in collecting TEM images of the catalysts used in this study. This work was partially supported through funding from the Defense Advanced Research Projects Agency (Surf-Cat: Catalysts for Production of JP-8 range molecules from Lignocellulosic Biomass). The views, opinions, and/or findings contained in this article are those of the author and should not be interpreted as representing the official views or policies, either expressed or implied, of the Defense Advanced Research Projects Agency or the Department of Defense. This material is also based upon work supported as part of the Catalysis Center for Energy Innovation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001004.
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Foster, A.J., Do, P.T.M. & Lobo, R.F. The Synergy of the Support Acid Function and the Metal Function in the Catalytic Hydrodeoxygenation of m-Cresol. Top Catal 55, 118–128 (2012). https://doi.org/10.1007/s11244-012-9781-7
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DOI: https://doi.org/10.1007/s11244-012-9781-7