外磁场对一氧化碳与赤铁矿相互作用的影响。

IF 2.9 3区化学 Q3 CHEMISTRY, PHYSICAL

Physical Chemistry Chemical Physics Pub Date : 2024-05-27 DOI:10.1039/D4CP01249F

P. A. Chernavskii and G. V. Pankina

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引用次数: 0

摘要

通过原位磁强计研究了在 250 至 350°C 等温条件下，外磁场对一氧化碳与赤铁矿相互作用的活化能（E*）的影响。对于沉积在硅胶上的尺寸为 20 纳米的赤铁矿纳米颗粒样品，在 60 Oe 至 3 kOe 的磁场强度范围内，显示了磁铁矿形成反应的 E* 与磁场强度的关系。发现了 E* 的极端磁场依赖性。1.Introduction CO + 赤铁矿反应是费托合成中铁负载催化剂活性中心形成的关键反应 [1-4]。从本质上讲，第一步涉及吸附在赤铁矿表面的 CO 氧化为 CO2，导致赤铁矿还原为磁铁矿。随后，CO 与磁铁矿发生反应，形成不同成分的碳化物 [5-11]。分散赤铁矿颗粒上的 CO 氧化过程也可用于去除气体混合物中的低浓度 CO [12-13]。在这种情况下，使用 CO-O2 混合气体时，赤铁矿起到催化剂的作用。对过程动力学的研究[13] 表明，活化能估计为 19.0 ± 0.14 kJ/mole。二氧化碳还原赤铁矿的动力学[14-16]也得到了研究。Fe2O3 + CO → Fe3O4 + CO2 反应的活化能从 33.28 到 74.00 kJ/mol 不等[17]。值得注意的是，在绝大多数研究一氧化碳还原赤铁矿动力学的著作中，都是以块状 Fe2O3 颗粒为例研究该反应的。

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The effect of an external magnetic field on the interaction of carbon monoxide with hematite

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The effect of an external magnetic field on the interaction of carbon monoxide with hematite

The effect of an external magnetic field on the activation energy (E*) of carbon monoxide interaction with hematite under isothermal conditions in the temperature range of 250 to 350 °C has been studied using in situ magnetometry. The dependence of E* of the reaction of magnetite formation on the magnetic field strength in the field strength range from 60 Oe to 3 kOe is shown for hematite nanoparticle samples deposited on 20 nm silica gel. An extreme field dependence of E* was observed.

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来源期刊

Physical Chemistry Chemical Physics 化学-物理：原子、分子和化学物理

CiteScore

5.50

自引率

9.10%

发文量

2675

审稿时长

2.0 months

期刊介绍： Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.