One-step synthesis of Pt@(CrMnFeCoNi)3O4 high entropy oxide catalysts through flame spray pyrolysis

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-08-30 DOI:10.1016/j.joei.2024.101804
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Abstract

High entropy oxides (HEOs) show great prospects in catalysis owing to their widely tunable component structures and ease of combination with active metals. However, the development of HEO catalysts is limited by the lack of efficient synthesis methods due to the difficulty of homogeneously mixing at least five elements. In this work, flame spray pyrolysis (FSP) is successfully employed to synthesize (CrMnFeCoNi)3O4 HEO with a single phase spinel structure in one step, which is verified by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and energy-dispersive X-ray spectroscopy (EDS). Taking CO catalytic oxidation as a probe reaction, the Pt@(CrMnFeCoNi)3O4 HEO catalyst synthesized by FSP in one step is compared with the catalyst whose Pt is impregnated on (CrMnFeCoNi)3O4 HEO support. The FSP-made catalysts have a higher catalytic reaction rate and better redox ability, which lowers the temperature of complete CO conversion by nearly 100 °C. Furthermore, it can be observed that the flame parameters can be optimized to modify the particle size and oxygen vacancies of the HEO nanoparticles, thus enhancing the catalytic performances. This work demonstrates that FSP is an effective method for the one-step synthesis of HEO catalysts with excellent catalytic performance, providing a new perspective for the synthesis of HEO-based materials.

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通过火焰喷射热解一步合成 Pt@(CrMnFeCoNi)3O4高熵氧化物催化剂
高熵氧化物(HEOs)由于其组分结构可广泛调整,且易于与活性金属结合,因此在催化领域具有广阔的前景。然而,由于很难将至少五种元素均匀混合,缺乏高效的合成方法限制了高熵氧化物催化剂的发展。本研究采用火焰喷射热解(FSP)技术,成功地一步合成了具有单相尖晶石结构的(CrMnFeCoNi)3O4 HEO,并通过 X 射线衍射(XRD)、高分辨率透射电子显微镜(HRTEM)、选区电子衍射(SAED)和能量色散 X 射线光谱(EDS)进行了验证。以一氧化碳催化氧化反应为研究对象,比较了通过 FSP 一步合成的 Pt@(CrMnFeCoNi)3O4 HEO 催化剂和在(CrMnFeCoNi)3O4 HEO 载体上浸渍 Pt 的催化剂。FSP 制成的催化剂具有更高的催化反应速率和更好的氧化还原能力,可将 CO 完全转化的温度降低近 100 °C。此外,还可以通过优化火焰参数来改变 HEO 纳米颗粒的粒度和氧空位,从而提高催化性能。这项工作表明,FSP 是一步合成具有优异催化性能的 HEO 催化剂的有效方法,为 HEO 基材料的合成提供了一个新的视角。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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