Design, Synthesis, Characterization and Catalytic Activity of Chromium Oxide Nanoparticles Immobilized on Layered Double Hydroxide as Competent Nanocatalyst

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2025-01-18 DOI:10.1007/s10562-024-04926-1

Jagat Singh Kirar

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Abstract

Transition metals are commonly used in the oxidation of cyclohexane, but their harsh reaction conditions and lack of efficiency make further use challenging. In this study, we prepared chromium nanoparticles supported on layered double hydroxide abbreviated as Cr₂O₃/LDH. The physiochemical properties of synthesized nanocatalysts were extensively studied using FTIR, XRD, SEM, EDX, TEM, ICP-AES, and XPS technique. The synthesized Cr₂O₃/LDH nanocatalyst was used to the liquid phase selective oxidation of cyclohexane under solvent-free condition. The characterization result indicates that the Cr₂O₃-NPs were uniformly dispersed on the surface of LDH. The Cr₂O₃-NPs alone have relatively low catalytic activity, while LDH has no catalytic activity. However, the Cr₂O₃-NPs/LDH hybrid significantly increases both the conversion and selectivity. A maximum conversion of 34.73% cyclohexane and 97.85% selectivity to KA oil obtained over the Cr₂O₃/LDH nanocatalyst. Furthermore, the leaching test showed that the Cr₂O₃/LDH nanocatalyst was heterogeneous and could be recycled at least six cycles without significant loss in catalytic efficiency.

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层状双氢氧化物固定氧化铬纳米颗粒的设计、合成、表征及催化活性研究

过渡金属通常用于环己烷的氧化，但其恶劣的反应条件和缺乏效率使得进一步使用具有挑战性。在本研究中，我们制备了层状双氢氧化物（简称Cr2O3/LDH）负载的纳米铬。采用FTIR、XRD、SEM、EDX、TEM、ICP-AES、XPS等技术对合成的纳米催化剂的理化性质进行了研究。将合成的Cr2O3/LDH纳米催化剂用于环己烷在无溶剂条件下的液相选择性氧化。表征结果表明，Cr2O3-NPs均匀分布在LDH表面。单独的Cr2O3-NPs具有较低的催化活性，而LDH没有催化活性。然而，Cr2O3-NPs/LDH杂化物显著提高了转化率和选择性。在Cr2O3/LDH纳米催化剂上，环己烷转化率为34.73%，KA油选择性为97.85%。此外，浸出试验表明，Cr2O3/LDH纳米催化剂是多相的，可以循环使用至少6次，而催化效率没有明显损失。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.