Abstract
The stability of a Pt/γ-Al2O3 catalyst in liquid water and aqueous solutions of 5 wt% glycerol or sorbitol at 225 °C is examined using a variety of physicochemical methods. It is demonstrated that the presence of glycerol and sorbitol significantly reduces the hydration of γ-Al2O3 to form boehmite as compared to treatment in pure water. The stability against hydration increases with increasing carbon chain length. Treatment with polyol solutions also results in reduced agglomeration of supported metal particles. The prevention of boehmite formation and agglomeration of metal particles are attributed to the formation of carbonaceous species on the surface. In addition to these effects, the deposits block a considerable portion of active metal surface area. IR spectroscopic analysis indicates that dehydration reactions play an important role in the formation of the carbonaceous deposits. The present results illustrate that water and dissolved biomass compounds can strongly affect the stability of heterogeneous catalysts under reaction conditions.
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Acknowledgments
We thank Sarah McNew, Jessica Ewbank, Jared McGrath, Abiola Shitta and Johannes Leisen for experimental support. The authors would also like to recognize financial support provided by the Brook Byers Institute for Sustainable Systems, the Hightower Chair and the Georgia Research Alliance. Access to analytical instruments provided by Sankar Nair and Christopher W. Jones is gratefully acknowledged.
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Ravenelle, R.M., Copeland, J.R., Van Pelt, A.H. et al. Stability of Pt/γ-Al2O3 Catalysts in Model Biomass Solutions. Top Catal 55, 162–174 (2012). https://doi.org/10.1007/s11244-012-9785-3
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DOI: https://doi.org/10.1007/s11244-012-9785-3