Magma oceans, iron and chromium redox, and the origin of comparatively oxidized planetary mantles

MM Hirschmann - Geochimica et Cosmochimica Acta, 2022 - Elsevier
The mantles of both Earth and Mars are more oxidized than would be expected based on
low pressure equilibration of molten silicate and alloy during their magma ocean stages …

Hexagonal BaTiO(3–x)Hx Oxyhydride as a Water-Durable Catalyst Support for Chemoselective Hydrogenation

M Miyazaki, K Ogasawara, T Nakao… - Journal of the …, 2022 - ACS Publications
We present heavily H–-doped BaTiO (3-x) H x (x≈ 1) as an efficient and water-durable
catalyst support for Pd nanoparticles applicable to liquid-phase hydrogenation reactions …

Melt chemistry and redox conditions control titanium isotope fractionation during magmatic differentiation

L Hoare, M Klaver, NS Saji, J Gillies… - … et Cosmochimica Acta, 2020 - Elsevier
Titanium offers a burgeoning isotope system that has shown significant promise as a tracer
of magmatic processes. Recent studies have shown that Ti isotopes display significant mass …

Equilibrium inter-mineral titanium isotope fractionation: Implication for high-temperature titanium isotope geochemistry

W Wang, S Huang, F Huang, X Zhao, Z Wu - Geochimica et Cosmochimica …, 2020 - Elsevier
Equilibrium Ti isotope fractionation factors among major Ti-bearing minerals are critical for
understanding Ti isotope fractionation during magmatic processes. We use the first …

Clues from Ab Initio Calculations on Titanium Isotopic Fractionation in Tholeiitic and Calc-Alkaline Magma Series

SM Aarons, N Dauphas, M Blanchard… - ACS earth and space …, 2021 - ACS Publications
Magmatic differentiation produces positive correlations between δ49Ti and SiO2. The
equilibrium Ti isotope fractionation factors of Ti-bearing minerals are essential for …

Ammonia Synthesis over Fe‐Supported Catalysts Mediated by Face‐Sharing Nitrogen Sites in BaTiO3−xNy Oxynitride

M Miyazaki, K Ikejima, K Ogasawara, M Kitano… - …, 2023 - Wiley Online Library
Nitride and hydride materials have been proposed as active supports for the loading of
transition metal catalysts in thermal catalytic ammonia synthesis. However, the contribution …

Redox and mineral controls on Fe and Ti isotopic fractionations during calc-alkaline magmatic differentiation

AC Johnson, ZJ Zhang, N Dauphas, RL Rudnick… - … et Cosmochimica Acta, 2023 - Elsevier
Titanium and Fe isotopic compositions of lavas from a calc-alkaline differentiation suite and
corresponding mineral separates from the Rindjani Volcano, Indonesia show that Fe and Ti …

VapoRock: thermodynamics of vaporized silicate melts for modeling volcanic outgassing and magma ocean atmospheres

AS Wolf, N Jäggi, PA Sossi… - The Astrophysical …, 2023 - iopscience.iop.org
Silicate vapors play a key role in planetary evolution, especially dominating early stages of
rocky planet formation through outgassed magma ocean atmospheres. Our open-source …

Titanium isotopic fractionation in Kilauea Iki lava lake driven by oxide crystallization

AC Johnson, SM Aarons, N Dauphas, NX Nie… - … et Cosmochimica Acta, 2019 - Elsevier
Recent work has demonstrated that titanium (Ti) isotopes undergo mass-dependent isotope
fractionation during magmatic differentiation, leaving evolved silicic melts preferentially …

Synergistic Hybrid Support Comprising TiO2–Carbon and Ordered PdNi Alloy for Direct Hydrogen Peroxide Synthesis

TT Huynh, WH Huang, MC Tsai, M Nugraha… - ACS …, 2021 - ACS Publications
The development of high-activity catalysts with good selectivity for the direct synthesis of
H2O2 from H2 and O2 remains challenging. TiO2–C used as a support material is able to …