Effect of Ag and Pd promotion on CH4selectivity in Fe(100) Fischer-Tröpsch catalysis.
The current CO2utilization market is dominated by enhanced oil recovery and urea manufacturing; yet, the scale of demand falls well short of that deemed necessary to make a significant impact on climate change. CO2conversion to fuels, however, is a utilization technology that can theoretically match the scale of projected CO2capture. Fischer-Tröpsch (FT) processing is a long-established technology for converting non-petroleum based precursors into transportation fuels and other valuable chemicals. Here, we report the effects of Pd and Ag doping on CH4selectivity over Fe(100), a common FT catalyst, as these metals have shown potential in the direct conversion of co-fed CO2. Adsorption energies for pathway specific C1 and C2 species were weakened in the presence of Ag and Pd by ca. 0.55 eV and 0.35 eV, respectively. Further, while both Ag- and Pd-promoted surfaces show decreased CH4production, Ag introduces a prohibitively high coupling barrier; thus, only Pd offered a decrease in CH4selectivity (-36%) relative to unmodified Fe(100).
Department of Chemistry, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA. d.ball@csuohio.edu and Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, USA.
Peter C
http://orcid.org/0000-0002-5302-3412
PC
Psarras
Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, CA 94305, USA.
Jennifer
J
Wilcox
Department of Chemistry, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA. d.ball@csuohio.edu.
David W
DW
Ball