Pressure-induced Chemistry of Fluid D<sub>2</sub>-CO<sub>2</sub> Mixtures
ORAL
Abstract
Constraining the high-pressure chemical behavior of the H2-CO2 system extends the understanding of Fischer-Tropsch chemistry and elucidates the geochemical behavior of planets like the early Earth. We investigated the high-pressure D2-CO2 system using the diamond anvil cell in conjunction with vibrational spectroscopy to characterize the phase and chemical changes that occur under static compression. We observe the 9:1 D2:CO2 mixture undergoes a multi-stage reduction to form a final equilibrium product of D2O + CD3OD, with spectroscopic data demonstrating this product assemblage's stability up to 10 GPa. Our experimental high-pressure chemistry results are compared with thermochemical calculations using first-principles simulations and literature values of candidate reaction pathways. These results provide experimental benchmarks for ongoing dynamic compression experiments, enabling the prediction of intermediate system assemblages, and constraining the final states relevant to planetary interior conditions.
*Work done at the University of Illinois Chicago was supported by the U.S. National Science Foundation (NSF, DMR-210488), and the US DOE - National Nuclear Security Administration (NNSA) through the Chicago/DOE Alliance Center (DE-NA0004153), and the DOE Office of Science (DE-SC0020340). A portion of this work was done at Sandia National Laboratories. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.
–
Publication:Pressure-induced Chemistry of Fluid D2-CO2 Mixtures
