用于异相催化的纳米结构氧化铁

IF 22.2 Q1 CHEMISTRY, MULTIDISCIPLINARY
Di Zhou, Yan Zhou, Yong Li, Wenjie Shen
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引用次数: 0

摘要

调节纳米级氧化铁颗粒的形状和晶相对于设计高效的异相催化剂至关重要。铁氧化物通常以赤铁矿(α-Fe2O3)、磁铁矿(γ-Fe2O3)和磁铁矿(Fe3O4)的形式存在,其中铁和氧的配位环境差异很大。铁氧化物在化学成分、颗粒大小/形状和晶相方面的多样性结构,有利于灵活调节与催化活性位点密切相关的表面铁原子和氧原子的几何和电子特性。调整特定尺寸/形状的氧化铁颗粒的晶相,可改变铁原子和氧原子在颗粒内部和表面的排列。而在特定晶相中调整颗粒形状,则可以通过铁原子和氧原子的独特排列,使反应性更强的表面得以暴露。所有这些策略都能最大限度地增加催化活性位点的数量,并调节反应分子的吸附和活化方式。此外,当氧化铁颗粒用于支撑催化活性更强的贵金属时,其形状和晶相还会通过界面键合和电荷转移影响贵金属的分散。在这种情况下,贵金属会通过与铁氧化物的相互作用显示出不同的电子特性,而它们的界面结合则受铁氧化物表面特性的制约。其中,锚定在铁氧化物上的贵金属单原子以孤立位点为特征,但它们的电子和几何结构与催化特性之间的直接关联却存在争议。另外,反向结构(贵金属颗粒上的氧化铁层)和核壳几何结构(贵金属核和氧化物壳)可以构建活性界面,并描述其几何和电子特性。此外,贵金属-支撑界面在反应气体和高温条件下的动态行为将为揭示内在结构-反应关系提供准确而真实的证据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanostructured iron oxides for heterogeneous catalysis

Nanostructured iron oxides for heterogeneous catalysis

Nanostructured iron oxides for heterogeneous catalysis

Modulating the shape and crystal-phase of nano-sized iron-oxide particles play an essential role in the design of highly efficient heterogeneous catalysts. Iron oxides usually present as hematite (α-Fe2O3), maghemite (γ-Fe2O3), and magnetite (Fe3O4), where the coordination environments of Fe and O vary considerably. The diversity structures of iron oxides, in terms of chemical composition, particle size/shape, and crystal-phase, favor a flexible mediation on the geometric and electronic characters of surface Fe and O atoms that are intimately linked to the active sites for catalysis. Tuning the crystal-phase of size/shape-specified FeOx particles alters the arrangements of Fe and O atoms both in the bulk and on the surface. While tailoring the particle shape, in a specific crystal-phase, enables to expose the more reactive facets featured by unique arrangements of Fe and O atoms. All these strategies could maximize the number of active sites for catalysis and regulate the adsorption and activation manner of reacting molecules. In addition, the shape and crystal-phase of FeOx particles, when they are used to support the catalytically more active precious metals, affect the dispersion of the precious-metals via interfacial bonding and charge transfer. In this context, the precious-metals would show distinct electronic features via interaction with iron oxides, while their interfacial bonding is governed by the surface properties of iron oxides. Among them, precious-metal single-atoms, anchored on iron oxides, are characterized by the isolated sites, but a straightforward correlation between their electronic and geometric structures and the catalytic properties is controversial. Alternatively, inverse structures (iron-oxide layers on precious -metal particles) and core-shell geometries (a precious-metal core and an oxide shell) enable to construct active interfaces and describe the geometric and electronic characters. Moreover, the dynamic behavior of precious-metal-support interfaces, under reactive gases and at high temperatures, would provide accurate and realistic evidences for revealing the intrinsic structure-reactivity relationships.

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来源期刊
EnergyChem
EnergyChem Multiple-
CiteScore
40.80
自引率
2.80%
发文量
23
审稿时长
40 days
期刊介绍: EnergyChem, a reputable journal, focuses on publishing high-quality research and review articles within the realm of chemistry, chemical engineering, and materials science with a specific emphasis on energy applications. The priority areas covered by the journal include:Solar energy,Energy harvesting devices,Fuel cells,Hydrogen energy,Bioenergy and biofuels,Batteries,Supercapacitors,Electrocatalysis and photocatalysis,Energy storage and energy conversion,Carbon capture and storage
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