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Synthesis and catalytic evaluation of PVP-CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water.

ABSTRACT: A highly efficient and eco-friendly route for the reduction of graphene oxide (GO) to reduced graphene oxide (rGO) was developed by using polyvinylpyrrolidone coated CeO₂ NPs (PVP-CeO₂) as a reducing and stabilizing agent. The resulting carbonaceous material, PVP-CeO₂/rGO, was well characterized with different spectroscopic techniques such as Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), elemental mapping, Transmission Electron Microscopy (TEM), Raman spectroscopy, powder X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray Photoelectron Spectroscopy (XPS), and Thermal Gravimetric (TG) analyses. The material exhibited high catalytic potential towards multicomponent reactions for the synthesis of biologically relevant benzodiazepine derivatives in aqueous media. The efficiency of the material for the desired reaction was shown in the form of an excellent product yield (96-98%) and a very short reaction time period (7-10 min). The use of water as solvent and recyclability of the catalyst made the present protocol acceptable from a green perspective.

SUBMITTER: Siddiqui S

PROVIDER: S-EPMC9419207 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Synthesis and catalytic evaluation of PVP-CeO2/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water.

Siddiqui Shaheen S Siddiqui Zeba N ZN

Nanoscale advances 20200828 10

A highly efficient and eco-friendly route for the reduction of graphene oxide (GO) to reduced graphene oxide (rGO) was developed by using polyvinylpyrrolidone coated CeO2 NPs (PVP-CeO2) as a reducing and stabilizing agent. The resulting carbonaceous material, PVP-CeO2/rGO, was well characterized with different spectroscopic techniques such as Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), element ...[more]

PMID: 36132914

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Project description:Construction of a C-C bond via alkylation of ketones with alcohol as the alkylating source by employing hydrogen-borrowing strategy is attracting significant attention and is highly appealing due to its simplicity, cost-effectiveness, environmental benefits, and the fact that water is the only byproduct. The development of heterogeneous catalysts based on nonprecious base metals is progressing rapidly. Our newly disclosed manganese-doped cerium oxide nanocomposite (10 wt % Mn@CeO2) stands out as a cost-efficient and air-stable catalyst, synthesized through a straightforward coprecipitation method and employed for α-alkylation of ketones with primary alcohols via the hydrogen-borrowing strategy. X-ray diffraction (XRD) analysis confirms the high crystallinity of CeO2, while field emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM) images reveal MnO2 nanoparticles, measuring 19 nm in size, uniformly decorated on the rod-shaped CeO2 nanoparticles, which have a size of 33 nm. X-ray photoelectron spectroscopy (XPS) analysis uncovers the presence of Mn4+ species embedded on the CeO2 nanorods. Electron paramagnetic resonance (EPR) analysis further indicates that surface defects contribute to the impressive catalytic yield, which ranges from 70 to 98% for the α-alkylated ketones. Thermogravimetric analysis (TGA) demonstrates the remarkable thermal stability of the catalyst, maintaining its stability up to 800 °C. Additionally, inductively coupled plasma mass spectrometry (ICP-MS) confirms no leaching of Mn ions, emphasizing the high heterogeneity of the catalyst. Remarkably, 10 wt % Mn@CeO2 nanocomposite is recycled for six cycles with no loss of catalytic activity. This study underscores the synergistic effect between the base metal MnO2 and redox pair of CeO2, which is key to the exceptional catalytic activity in α-alkylation reactions, making 10 wt % Mn@CeO2 a highly promising catalyst for sustainable and efficient C-C bond formation.

Dataset Information

Synthesis and catalytic evaluation of PVP-CeO₂/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water.

Publications

Synthesis and catalytic evaluation of PVP-CeO<sub>2</sub>/rGO as a highly efficient and recyclable heterogeneous catalyst for multicomponent reactions in water.

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