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Co single-atom catalyst for efficient and long-acting activation of peroxymonosulfate: Formation of Co-N site and insight into the activation mechanism.
J Hazard Mater
January 2025
College of Polymer Science & Engineering, Sichuan University, Chengdu 610065, China. Electronic address:
While single-atom catalysts (SACs) have been extensively investigated as a high-atom-efficiency heterogeneous catalyst for peroxymonosulfate (PMS) oxidation reaction, the stable constructing and activation efficacy of the reaction sites remains less clarified. Herein, we employed gelatin as a N,O-bidentate ligand for Co (II) to form for a N-doped carbon precursor, while introducing NaCl as a template agent to induce the adoption of a Co-N conformation and disorganize the Co-O moiety. This approach facilitates uniform spatial isolation and atomic-level dispersion of Co atoms within the aerogel, effectively inhibiting the aggregation of Co during synthesis and enabling precise and controllable preparation of Co single-atom catalysts (SACs).
View Article and Find Full Text PDFRapid CO mineralization by zeolite via cation exchange.
Sci Rep
January 2025
Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
This study illuminates the mineral carbonation potential of zeolite minerals. Zeolite minerals are common alteration products of basaltic rocks and are known for their ability to rapidly exchange their interstitial cations with those in aqueous solutions. A series of closed system batch reactor experiments was conducted at 60 °C by combining stilbite, a Ca-bearing zeolite, with 0.
View Article and Find Full Text PDFSynthesis and Reactivity of an Olefin Metathesis-Catalyzing Ruthenium Complex with a Selenoether Moiety in the Benzylidene Ligand.
ACS Omega
December 2024
Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan.
A Hoveyda-Grubbs (HG)-type olefin metathesis complex with a selenoether moiety at the terminus of phenoxy moiety was synthesized. The complex showed direct selenium-atom coordination to the ruthenium center, resulting in higher thermodynamic stability compared with the parent HG catalyst. The selenium atom binding enhanced the tolerance to protic solvent molecules in ring-closing metathesis of -tosyldiallylamide and diethyl diallylmalonate, and also in the cross metathesis between 3-butenylbenzoate and methyl acrylate.
View Article and Find Full Text PDFPhotoredox-Catalyzed 1,4-Dichloromethyldimerization of Alkenes with Chloroform: Access to Polychlorinated Vicinal Diaryl Alkanes.
Chemistry
January 2025
Southwest University, Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, 400715, Chongqing, CHINA.
A visible-light-mediated strategy is reported for the direct synthesis of polychlorinated vicinal diaryl alkanes from aryl alkenes and chloroform. In this approach, two haloalkyl radicals generated from chloroform via halogen atom transfer (XAT) and direct single electron transfer (SET) within the same photoredox catalysis cycle enable the 1,4-dichloromethyldimerization of alkenes. Besides chloroform, this strategy is applicable to carbon tetrachloride, bromotrichloromethane, and α-bromo carboxylic esters, yielding corresponding 1,4-disubstituted vicinal diaryl alkanes.
View Article and Find Full Text PDFEffects of Temperature Fluctuations on Surface Mobility of Atomic Steps and Oxidation Dynamics in High-Temperature Alloys.
J Am Chem Soc
January 2025
Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York 13902, United States.
In contrast to the traditional perspective that thermal fluctuations are insignificant in surface dynamics, here we report their influence on surface reaction dynamics. Using real-time low-energy electron microscopy imaging of NiAl(100) under both vacuum and O atmospheres, we demonstrate that transient temperature variations substantially alter the direction of atom diffusion between the surface and bulk, leading to markedly different oxidation outcomes. During heating, substantial outward diffusion of atoms from the bulk to the surface results in step growth.
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