Cobalt Carbon Bonding during Carbon Hydrogasification Revealed by 59Co Internal Field NMR

被引:0
|
作者
Scholzen, Pascal [1 ,2 ]
Han, Gao-Feng [3 ]
Lang, Guillaume [4 ]
Andreev, Andrey S. [5 ]
Baek, Jong-Beom [3 ]
de Lacaillerie, Jean-Baptiste d'Espinose [1 ]
机构
[1] Univ PSL, ESPCI PSL Paris, CNRS, UMR 7615,Soft Matter Sci & Engn Lab SIMM, F-75005 Paris, France
[2] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4R2, Canada
[3] Ulsan Natl Inst Sci & Technol UNIST, Ctr Dimens Controllable Organ Frameworks, Sch Energy & Chem Engn, 50 UNIST, Ulsan 44919, South Korea
[4] Univ PSL, Lab Phys & Etud Mat LPEM, CNRS, ESPCI Paris PSL,UMR 8213, F-75005 Paris, France
[5] TotalEnergies OneTech, 2 Pl Jean Millier, F-92400 Courbevoie, France
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2024年 / 128卷 / 28期
基金
新加坡国家研究基金会; 欧盟地平线“2020”;
关键词
NUCLEAR-MAGNETIC-RESONANCE; X-RAY; ALLOTROPIC TRANSFORMATION; THIN-FILMS; CO; CATALYSTS; ALLOY;
D O I
10.1021/acs.jpcc.4c02634
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Cobalt catalysts are involved in many chemical processes crucial to the energy transition and the shift from oil to biosourced chemicals. Thanks to the ferromagnetic character of cobalt metal, these catalysts can be studied by nuclear magnetic resonance (NMR) in the internal magnetic field of the particle. Using carbon hydrogasification as an example, this work illustrates the potential of Co-59 internal field (IF) NMR to study the Co crystallite phase transitions and to distinguish quantitatively, within the limits of the skin effect, different Co-C intermediates present inside a sample containing cobalt and carbon. Here, the main Co-C intermediates evidenced are a Co/C solid solution and a Co3C phase. When using a ball milling process for carbon hydrogasification, a high amount of Co-C intermediates forms, and the reaction rate is increased by several orders of magnitude compared to a classic catalytic reaction (in a fixed-bed reactor). In this work, the time evolution of the Co-59 IF NMR are compared to the reaction rate of carbon hydrogasification over the course of the ball milling process. We find a direct relationship between the amount of Co-C intermediates inside the sample and the reaction rate. This confirms that, like for a carbon hydrogasification reaction under classic conditions, the carbon dissociation and formation of Co-C bonds is the rate-determining step.
引用
收藏
页码:11638 / 11645
页数:8
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