Reactivation of Ni-TiO2 catalysts in hydrogen flow and in supercritical 2-propanol—Comparative study by electron spin resonance in situ

IF 1.9 3区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Magnetic Resonance in Chemistry Pub Date : 2023-09-08 DOI:10.1002/mrc.5385
Irina Kandarakova, Stanislav Yakushkin, Nikolay Nesterov, Alexey Philippov, Oleg Martyanov
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Abstract

Highly dispersed Ni-TiO2 catalyst has been studied in the process of preparation and under catalytic transfer hydrogenation reaction conditions in supercritical 2-propanol (250°C, 70 bar) using electron spin resonance in situ. Electron spin resonance in situ has been used to study the process of the catalyst passivation and subsequent reduction of the oxide layer in the gas flow. Reduction of the NiO layer on the surface of passivated Ni nanoparticles has been detected in supercritical 2-propanol, which is in agreement with kinetic modeling data. It has been found that the reduction of the nickel oxide layer in supercritical 2-propanol occurs at a lower temperature compared with the reduction in hydrogen flow, according to in situ electron spin resonance study.

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Ni-TiO2催化剂在氢流和超临界2-丙醇中的反应——电子自旋共振原位比较研究
在超临界2-丙醇(250°C,70 bar)的电子自旋共振。原位电子自旋共振已被用于研究气流中催化剂钝化和随后氧化层还原的过程。在超临界2-丙醇中检测到钝化Ni纳米颗粒表面NiO层的还原,这与动力学建模数据一致。根据原位电子自旋共振研究,已经发现,与氢流中的还原相比,在超临界2-丙醇中氧化镍层的还原发生在更低的温度下。
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来源期刊
CiteScore
4.70
自引率
10.00%
发文量
99
审稿时长
1 months
期刊介绍: MRC is devoted to the rapid publication of papers which are concerned with the development of magnetic resonance techniques, or in which the application of such techniques plays a pivotal part. Contributions from scientists working in all areas of NMR, ESR and NQR are invited, and papers describing applications in all branches of chemistry, structural biology and materials chemistry are published. The journal is of particular interest not only to scientists working in academic research, but also those working in commercial organisations who need to keep up-to-date with the latest practical applications of magnetic resonance techniques.
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