NiCo2O4 nanoparticles: an efficient and magnetic catalyst for Knoevenagel condensation

Fang, Yangyang; Wang, Xiaozhong; Chen, Yingqi; Dai, Liyan

doi:10.1631/jzus.a1900535

Cited by 12 publications

(6 citation statements)

References 43 publications

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“…Additionally, several diffractive peaks were observed for CeO 2 at 2θ = 28.56°, 33.08°, 47.47°, 56.3°, 69.40°, 76.6°, and 79.07°, corresponding to the crystal planes of (111), (200), (220), (311), (400), (331), and (420), respectively . Diffractive peaks for NiO were observed at 2θ = 37.1°, 43.1°, and 62.4°, which corresponded to the (111), (200), and (220) planes, respectively. , Finally, the peaks appeared at 2θ of 31.1°, 36.6°, 59°, and 65.1° were correlated to the crystal planes of (220), (311), (511), and (440) in NiCo 2 O 4 (nickel cobaltite), respectively. , From Figure a, it can be deduced that substituting the A-site in CeNiO 3 with various Ce 1– x Co x ratios resulted in the formation of different phases alongside the CeNiO 3 perovskite, namely NiCo 2 O 4 , NiO, and CeO 2 metal oxides.…”

Section: Resultsmentioning

confidence: 88%

“… 57 , 58 Finally, the peaks appeared at 2θ of 31.1°, 36.6°, 59°, and 65.1° were correlated to the crystal planes of (220), (311), (511), and (440) in NiCo 2 O 4 (nickel cobaltite), respectively. 59 , 60 From Figure 3 a, it can be deduced that substituting the A-site in CeNiO 3 with various Ce 1– x Co x ratios resulted in the formation of different phases alongside the CeNiO 3 perovskite, namely NiCo 2 O 4 , NiO, and CeO 2 metal oxides.…”

Section: Resultsmentioning

confidence: 99%

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Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths

Baamran,

Lawson,

Rownaghi

et al. 2023

JACS Au

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Carbon capture, utilization, and storage (CCUS) technologies are pivotal for transitioning to a net-zero economy by 2050. In particular, conversion of captured CO 2 to marketable chemicals and fuels appears to be a sustainable approach to not only curb greenhouse emissions but also transform wastes like CO 2 into useful products through storage of renewable energy in chemical bonds. Bifunctional materials (BFMs) composed of adsorbents and catalysts have shown promise in reactive capture and conversion of CO 2 at high temperatures. In this study, we extend the application of 3D printing technology to formulate a novel set of BFMs composed of CaO and Ce 1−x Co x NiO 3 perovskite-type oxide catalysts for the dual-purpose use of capturing CO 2 and reforming CH 4 for H 2 production. Three honeycomb monoliths composed of equal amounts of adsorbent and catalyst constituents with varied Ce 1−x Co x ratios were 3D printed to assess the role of cobalt on catalytic properties and overall performance. The samples were vigorously characterized using X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), N 2 physisorption, X-ray photoelectron spectroscopy (XPS), H 2 -TPR, in situ CO 2 adsorption/desorption XRD, and NH 3 -TPD. Results showed that the Ce 1−x Co x ratios�x = 0.25, 0.50, and 0.75�did not affect crystallinity, texture, or metal dispersion. However, a higher cobalt content reduced reducibility, CO 2 adsorption/desorption reversibility, and oxygen species availability. Assessing the structured BFM monoliths via combined CO 2 capture and CH 4 reforming in the temperature range 500−700 °C revealed that such differences in physiochemical properties lowered H 2 and CO yields at higher cobalt loading, leading to best catalytic performance in Ce 0.75 Co 0.25 NiO 3 /Ca sample that achieved 77% CO 2 conversion, 94% CH 4 conversion, 61% H 2 yield, and 2.30 H 2 /CO ratio at 700 °C. The stability of this BFM was assessed across five adsorption/reaction cycles, showing only marginal losses in the H 2 /CO yield. Thus, these findings successfully expand the use of 3D printing to unexplored perovskite-based BFMs and demonstrate an important proof-of-concept for their use in combined CO 2 capture and utilization in H 2 production processes.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths

Baamran,

Lawson,

Rownaghi

et al. 2023

JACS Au

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“…The results showed that the Néel relaxation heating efficiency increased linearly with the increase of the external alternating magnetic field. Fang et al [50] prepared a magnetic bimetallic NiCo 2 O 4 magnetic core by coprecipitation method. In the condensation reaction, the reactant conversion was 99%, and the catalytic activity of the catalyst will not be significantly reduced after 20 times cycles.…”

Section: Magnetic Catalyst Coresmentioning

confidence: 99%

“…The Knoevenagel condensation reaction has a widely used application. For instance, Fang et al [50] developed an efficient magnetic bimetallic NiCo 2 O 4 nanocatalyst by coprecipitation for the Knoevenagel condensation reaction of various benzaldehyde with malononitrile to be investigated. Marin et al [71] used an easily available FeNi 3 @NiNPs catalyst for the synthesis of biomass-derived molecules.…”

Section: Catalysis Materials Synthesismentioning

confidence: 99%

Research Progress on Magnetic Catalysts and Its Application in Hydrogen Production Area

Wang

Guan

et al. 2022

Energies

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The noncontact heating technology of IH targets heat directly where it is needed through the electromagnetic energy adsorption and conversion of magnetic materials. Unlike conventional heating methods, the heat generated by electromagnetic induction of magnetic materials can be applied directly into the reactor without heating the entire device; this new heating method is not only more energy efficient but also safer, cleaner and more sustainable if renewable electricity is adopted; moreover, magnetic catalysts can be recovered and reused by separating chemical reactants and products from the catalyst by the application of a magnetic field, and it can provide the required heat source for the reaction without altering its catalytic properties. Magnetic catalysts with an electric field have been applied to some industrial areas, such as the preparation of new materials, catalytic oxidation reactions, and high-temperature heat absorption reactions. It is a trend that is used in the hydrogen production process, especially the endothermic steam reforming process. Therefore, in this paper, the heat release mechanism, properties, preparation methods and the application of magnetic catalysts were presented. Highlights of the application and performance of magnetic catalysts in the hydrogen production area were also discussed.

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“…In our case, a new low-temperature peak at Т 1 max = 205 °С can be associated with the reduction of Ni 2+ cations in the composition of NiCo2O4. It is believed [46] that the electronic conductivity of nickel-cobalt compounds is higher than that of the oxides NiO or Co3O4 themselves. An increase in the content of cobalt in the composition of the bimetallic catalyst led to a shift in the reduction temperature of their active phases towards higher temperatures (441, 458 → 497 °C).…”

Section: Characterization Of the Support And Supported Catalystsmentioning

confidence: 99%

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

Ергазиева

Makayeva

Shaimerden

et al. 2021

Bull. Chem. React. Eng. Catal.

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This article discusses the decomposition of methane in the temperature range 550–800 °C on low-percentage monometallic (Ni/g-Al2O3, Co/g-Al2O3) and bimetallic (Ni-Co/g-Al2O3) catalysts. It is shown that the bimetallic catalyst is more active in the decomposition of methane to hydrogen than monometallic ones. At a reaction temperature of 600 °C, the highest methane conversion is 81%, and the highest hydrogen yield of 51% is formed on Ni-Co/g-Al2O3. A complex of physicochemical methods (Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR-H2), etc.) established that the addition of cobalt oxide to the composition of Ni/g-Al2O3 leads to the formation of surface bimetallic Ni-Co alloys, while the dispersion of particles increases and the reducibility of the catalyst is facilitated, which provides an increase in the concentration of metal particles - active centers, which can be the reason for an increase in the catalytic properties of a bimetallic catalyst in comparison with monometallic ones. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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NiCo2O4 nanoparticles: an efficient and magnetic catalyst for Knoevenagel condensation

Cited by 12 publications

References 43 publications

Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths

Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths

Research Progress on Magnetic Catalysts and Its Application in Hydrogen Production Area

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

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NiCo2O4 nanoparticles: an efficient and magnetic catalyst for Knoevenagel condensation

Cited by 12 publications

References 43 publications

Reactive Capture and Conversion of CO2 into Hydrogen over Bifunctional Structured Ce1–xCoxNiO3/Ca Perovskite-Type Oxide Monoliths

Reactive Capture and Conversion of CO2 into Hydrogen over Bifunctional Structured Ce1–xCoxNiO3/Ca Perovskite-Type Oxide Monoliths

Research Progress on Magnetic Catalysts and Its Application in Hydrogen Production Area

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

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Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths

Reactive Capture and Conversion of CO₂ into Hydrogen over Bifunctional Structured Ce_1–xCo_xNiO₃/Ca Perovskite-Type Oxide Monoliths