Ceria modified by the addition of gallium or indium (20 mol%) was used as a support for cobalt Fischer-Tropsch synthesis. The addition of gallium to ceria improved the CO conversion for cobalt, whereas indium tended to decrease it. A similar trend was observed with the Ag-promoted cobalt/ceria catalysts that were doped with Ga or In. For Ag promoted catalysts, doping with Ga or In decreased methane and increased the product selectivities of olefins and alcohols. The sum of olefins and alcohols in terms of product selectivity for the Ag-promoted catalysts decreased in the following order: Ag-Co/Ce-Ga > Ag-Co/Ce-In > Ag-Co/Ce. The H2-TPR-XANES data shown that addition of gallium or indium to ceria increased the fraction of surface Ce3+ for both unpromoted and Ag promoted catalysts. This partially reduced ceria plays an important role in the product selectivity of cobalt for FT synthesis.
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The work carried out at the CAER was supported in part by funding from the Commonwealth of Kentucky. Argonne’s research was supported in part by the U.S. Department of Energy (DOE), Office of Fossil Energy, National Energy Technology Laboratory (NETL). The use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Gnanamani, Muthu Kumaran; Jacobs, Gary; Shafer, Wilson D.; Martinelli, Michela; Cronauer, Donald C.; Kropf, A. Jeremy; Marshall, Christopher L.; and Davis, Burtron H., "Ga and In Modified Ceria as a Support for Cobalt Fischer-Tropsch Synthesis" (2017). Center for Applied Energy Research Faculty Publications. 25.