Exploring the Chemical Reactivity between Carbon Dioxide and Three Transition Metals (Au, Pt, and Re) at High-Pressure, High-Temperature Conditions
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-10-06 |
| Journal | Inorganic Chemistry |
| Authors | David SantamarıĢa-PĆ©rez, C. P. McGuire, A. R. Makhluf, A. Kavner, Raquel ChuliĆ”-JordĆ”n |
| Institutions | Universidad de La Laguna, University of California, Los Angeles |
| Citations | 23 |
Abstract
Section titled āAbstractāThe role of carbon dioxide, CO<sub>2</sub>, as oxidizing agent at high pressures and temperatures is evaluated by studying its chemical reactivity with three transition metals: Au, Pt, and Re. We report systematic X-ray diffraction measurements up to 48 GPa and 2400 K using synchrotron radiation and laser-heating diamond-anvil cells. No evidence of reaction was found in Au and Pt samples in this pressure-temperature range. In the Re + CO<sub>2</sub> system, however, a strongly-driven redox reaction occurs at P > 8 GPa and T > 1500 K, and orthorhombic Ī²-ReO<sub>2</sub> is formed. This rhenium oxide phase is stable at least up to 48 GPa and 2400 K and was recovered at ambient conditions. Raman spectroscopy data confirm graphite as a reaction product. Ab-initio total-energy structural and compressibility data of the Ī²-ReO<sub>2</sub> phase shows an excellent agreement with experiments, altogether accurately confirming CO<sub>2</sub> reduction P-T conditions in the presence of rhenium metal and the Ī²-ReO<sub>2</sub> equation of state.