title: Exploring the Chemical Reactivity between Carbon Dioxide and Three Transition Metals (Au, Pt, and Re) at High-Pressure, High-Temperature Conditions.
abstract: The role of carbon dioxide, CO2, 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 + CO2system, however, a strongly-driven redox reaction occurs at P > 8 GPa and T > 1500 K, and orthorhombic β-ReO2is 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 β-ReO2phase shows an excellent agreement with experiments, altogether accurately confirming CO2reduction P-T conditions in the presence of rhenium metal and the β-ReO2equation of state.
authors.affiliation: Earth, Planetary and Space Sciences Department, University of California Los Angeles , Los Angeles, California 951567, United States.|Departamento de Física Aplicada-ICMUV, Universidad de Valencia , Valencia 46100, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Santamaría-Pérez
authors.affiliation: Earth, Planetary and Space Sciences Department, University of California Los Angeles , Los Angeles, California 951567, United States.
authors.forename: Chris
authors.initials: C
authors.lastname: McGuire
authors.affiliation: Earth, Planetary and Space Sciences Department, University of California Los Angeles , Los Angeles, California 951567, United States.
authors.forename: Adam
authors.initials: A
authors.lastname: Makhluf
authors.affiliation: Earth, Planetary and Space Sciences Department, University of California Los Angeles , Los Angeles, California 951567, United States.
authors.forename: Abby
authors.initials: A
authors.lastname: Kavner
authors.affiliation: Departamento de Física Aplicada-ICMUV, Universidad de Valencia , Valencia 46100, Spain.
authors.forename: Raquel
authors.initials: R
authors.lastname: Chuliá-Jordán
authors.affiliation: Departamento de Física Aplicada-ICMUV, Universidad de Valencia , Valencia 46100, Spain.
authors.forename: Julio
authors.initials: J
authors.lastname: Pellicer-Porres
authors.affiliation: Departamento de Física Aplicada-ICMUV, Universidad de Valencia , Valencia 46100, Spain.
authors.forename: Domingo
authors.initials: D
authors.lastname: Martinez-García
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Andrew
authors.initials: A
authors.lastname: Doran
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Martin
authors.initials: M
authors.lastname: Kunz
authors.affiliation: Departamento de Física, Instituto Univ. de Materiales y Nanotecnología, Universidad de La Laguna , La Laguna, Tenerife, 38206 Spain.
authors.forename: Plácida
authors.initials: P
authors.lastname: Rodríguez-Hernández
authors.affiliation: Departamento de Física, Instituto Univ. de Materiales y Nanotecnología, Universidad de La Laguna , La Laguna, Tenerife, 38206 Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Muñoz