471867 Improving the Hydrothermal Stability of Heterogeneous Catalysts for Conversion of Biorenewables Via Carbon Coating and Overcoating
Improving the Hydrothermal Stability of Heterogeneous Catalysts for Conversion of Biorenewables via Carbon Coating and Overcoating
Hien N. Pham1, Haifeng Xiong1, Pu Duan2, Xiaoyan Cao2, Klaus Schmidt-Rohr2, Robert L. Johnson3, James A. Dumesic4 and Abhaya K. Datye1
(1) Department of Chemical and Biological Engineering, and Center for Microengineered Materials, University of New Mexico, Albuquerque, NM
(2) Department of Chemistry, Brandeis University, Waltham, MA
(3) Department of Chemical and Biological Engineering, Iowa State University, Ames, IA
(4) Department of Chemical and Biological Engineering, University of Wisconsin, Madison, WI
Abstract:
A major challenge for the production of biomass-derived feedstocks to value-added chemicals and fuels is the development of catalysts and supports that are hydrothermally stable during conversion of biorenewables. Conventional catalysts and supports designed for gas-phase reactions may not be suitable for aqueous-phase reactions, particularly at temperatures in excess of 200 °C, due to loss of surface area and structural integrity of the support, and sintering or leaching of the metal phase [1]. We show that we can significantly improve the hydrothermal stability of catalytic materials by modifying them with a few overlayers of carbon [2,3]. Using a CVD or liquid-phase route, we can tailor the carbon overlayers by modifying the extent of graphitization and study how the nature of the carbon affects the catalytic performance under aqueous-phase reaction conditions. The efficacy of our carbon coating approach is demonstrated by the improved stability of precious and non-precious metal catalysts for hydrogenation reactions [4].
References:
[1] Xiong, H., Pham, H.N., and Datye, A.K. Green Chem. 16, 4627 (2014).
[2] Pham, H.N., Anderson, A.E., Johnson, R.L., Schmidt-Rohr, K., and Datye, A.K. Angew. Chem. Int Ed. 51, 13163 (2012).
[3] Xiong, H., Schwartz, T.J., Andersen, N.I., Dumesic, J.A., and Datye, A.K. Angew. Chem. Int Ed. 54, 7939 (2015).
[4] Pham, H.N., Anderson, A.E., Johnson, R.L., Schwartz, T.J., ONeill, B.J., Duan, P., Schmidt-Rohr, K., Dumesic, J.A., and Datye, A.K. ACS Catal. 5, 4546 (2015).
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