Results 181 to 190 of about 1,382,192 (301)

Oxygen isotope (δ¹⁸O, Δ'¹⁷O) insights into continental mantle evolution since the Archean. [PDF]

Nat Commun, 2022
Bindeman IN, Ionov DA, Tollan PME, Golovin AV.   +3 more
europepmc   +1 more source

Hole‐Activated Lattice Oxygen Enables Pt‐Free Propane Dehydrogenation by Eliminating the Hydrogen Recombination Bottleneck

Angewandte Chemie, EarlyView.
Trace Mg doping into gallia–alumina generates hole‐type oxygen species that accelerate hydrogen recombination, eliminating the need for Pt promotion. The fully oxide‐based catalyst resists sintering under repeated regeneration, outperforming benchmark PtSn and CrOx catalysts with exceptional stability over 30 dehydrogenation–regeneration cycles ...
DongHwan Oh, Jaewoo Jeong, Susung Lee, Younghwan Park, Seunghyuck Chi, Yaejun Baik, Hyungjun Kim, Hyeyoung Shin, Minkee Choi   +8 more
wiley   +1 more source

Determining Olefinic and Phenolic Fractions in Dissolved Organic Matter by Ozonation with Stable Oxygen Isotope Analysis of H₂O₂. [PDF]

Environ Sci Technol
Kim S, Halder ML, Hofstetter TB, von Gunten U.   +3 more
europepmc   +1 more source

Oxygen Isotope Fractionation in U₃O₈ during Thermal Processing in Humid Atmospheres. [PDF]

ACS Omega, 2022
Klosterman MR, Oerter EJ, Singleton MJ, McDonald LW.   +3 more
europepmc   +1 more source

Directional Second Sphere Effect on CO2 Activation and Reduction by Iron Porphyrin in Aprotic and Protic Media

Angewandte Chemie, EarlyView.
Directional control within the secondary coordination sphere redefines CO2 reduction by iron porphyrins. Simply rearranging identical urea hydrogen‐bond donors modulates reactivity, revealing that optimal catalysis does not only arise from maximal intermediate stabilization, but also from directional, adaptive non‐covalent interactions that balance ...
Ashutosh Vishwakarma, Sami Essid, Sarah Bouery, Régis Guillot, Bernard Boitrel, Philipp Gotico, Marie Sircoglou, Zakaria Halime   +7 more
wiley   +1 more source

Regional estimation by oxygen isotope ratio analysis using tooth enamel of Japanese individuals. [PDF]

Forensic Sci Res
Ono K, Someda H, Hashimoto M, Nakamura Y, Tayasu I, Yoshimizu C, Ishikawa N.   +6 more
europepmc   +1 more source

Natal origin of Pacific bluefin tuna Thunnus orientalis determined by SIMS oxygen isotope analysis of otoliths. [PDF]

PLoS One, 2022
Hane Y, Ushikubo T, Yokoyama Y, Miyairi Y, Kimura S.   +4 more
europepmc   +1 more source

Activating Triplet Excitons in COFs via Layer‐Bridging Co Single Atoms for Photocatalytic H2O2 Production and Tandem C─N Coupling

Angewandte Chemie, EarlyView.
This work demonstrates a layer‐bridging coordination strategy of Co single atoms in COFs that promotes the formation and utilization of triplet excited states. The introduction of Co single atoms induces pronounced energy‐level splitting and enhanced spin–orbit coupling, facilitating the generation of 1O2 and O2•– for efficient photocatalytic H2O2 ...
Guoen Tang, Jianjun Zhang, Guijie Liang, Jinfeng Zhang, Chuanbiao Bie, Jiaguo Yu, Hermenegildo García   +6 more
wiley   +1 more source

Oxygen Isotope Analyses of Phosphate and Organophosphorus Compounds by Electrospray Ionization Orbitrap Mass Spectrometry. [PDF]

Anal Chem
Bernet NM, Soldini C, Felder TMO, Lapčíková K, Neubauer C, Queen WL, Kaegi R, Tamburini F, Hofstetter TB.   +8 more
europepmc   +1 more source

Triple oxygen isotope constraints on atmospheric O₂ and biological productivity during the mid-Proterozoic. [PDF]

Proc Natl Acad Sci U S A, 2021
Liu P, Liu J, Ji A, Reinhard CT, Planavsky NJ, Babikov D, Najjar RG, Kasting JF.   +7 more
europepmc   +1 more source