(274c) 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., O’Neill, B.J., Duan,
P., Schmidt-Rohr, K., Dumesic, J.A., and Datye, A.K. ACS Catal. 5, 4546
(2015).