Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method

Fukui, Kiichi; Igawa, Yusuke; Arimitsu, Naoki; Suzuki, Masahiro; Segawa, Tomoomi; Fujii, K.; Yamamoto, Tetsuya; Yoshida, Hideto

doi:10.1016/j.cej.2012.09.032

Cited by 14 publications

(6 citation statements)

References 26 publications

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“…There was few reports on the synthesis of single hexagonal β‐Co(OH) 2 sheets without surfactants, or templates at atmospheric pressure. It is well known that microwave‐assisted synthesis has been efficiently applied in preparing functional nanomaterials due to its simple, quick, uniform, and energy efficient . In this work, porous nanosheet‐like Co 3 O 4 was effectively constructed from common Co(NO 3 ) 2 solution without any surfactants or templates under microwave radiation conditions at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄

Yao

Liu

Dai

et al. 2017

Journal of the Chinese Chemical Society

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Porous Co3O4 nanosheets were designed and fabricated from common Co(NO3 )2 solution without any surfactants or templates under microwave radiation conditions. After the microstructures and morphologies were characterized by scanning electron microscope (SEM), X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), and N2 absorption/desorption isotherms techniques, the obtained Co3O4 nanosheets were applied for reversible Li‐storage, displaying larger capacity, better cycling performance and rate capability, i.e., a reversible specific capacity of ca. 800 mAh/g during initial 30 cycles and a reversible capacity of 450 mAh/g at 2C for Co3O4 nanosheets, which were almost twice higher than those for Co3O4 nanoparticles. The improved cycling stability could be attributed to the remarkable synergistic effects between porous structures and nanosheet‐like morphologies.

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Section: Introductionmentioning

confidence: 99%

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄

Yao

Liu

Dai

et al. 2017

Journal of the Chinese Chemical Society

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“…Nanoclusters have been investigated for many catalytic applications due to their large surface-to-volume ratio. Recently, physical properties, it is of vital importance to control both the catalyst particle size as well as the catalyst particle size distribution [17][18][19][20][21][22][23]. The designed nanostructured materials were used as heterogeneous catalysts and their performance was compared to the traditional powder catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Those types of reactions are widely used in many areas like agricultural, medicinal, and pharmaceutical applications [11][12][13]23,[38][39][40][41][42]. The new synthetic trends are mainly focused recently on using catalysis at the nano scale for green chemistry using microwave assisted synthesis [11][12][13]15,16,18,20,22,23,[40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles as an Efficient Nanocomposite for Catalysis Applications in Cross-Coupling Reactions

Elazab

El-Idreesy

2019

Bull. Chem. React. Eng. Catal.

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This paper reported a scientific approach adopting microwave-assisted synthesis as a synthetic route for preparing highly active palladium nanoparticles stabilized by polyvinylpyrrolidone (Pd/PVP) and supported on reduced Graphene oxide (rGO) as a highly active catalyst used for Suzuki, Heck, and Sonogashira cross coupling reactions with remarkable turnover number (6500) and turnover frequency of 78000 h -1 . Pd/PVP nanoparticles supported on reduced Graphene oxide nanosheets (Pd-PVP/rGO) showed an outstanding performance through high catalytic activity towards cross coupling reactions. A simple, reproducible, and reliable method was used to prepare this efficient catalyst using microwave irradiation synthetic conditions. The synthesis approach requires simultaneous reduction of palladium and in the presence of Gaphene oxide (GO) nanosheets using ethylene glycol as a solvent and also as a strong reducing agent. The highly active and recyclable catalyst has so many advantages including the use of mild reaction conditions, short reaction times in an environmentally benign solvent system. Moreover, the prepared catalyst could be recycled for up to five times with nearly the same high catalytic activity. Furthermore, the high catalytic activity and recyclability of the prepared catalyst are due to the strong catalyst-support interaction. The defect sites in the reduced Graphene oxide (rGO) act as nucleation centers that enable anchoring of both Pd/PVP nanoparticles and hence, minimize the possibility of agglomeration which leads to a severe decrease in the catalytic activity.one of the main interests that attracted researchers' attention is transition metals based materials, especially when using palladium nanoparticles [5][6][7][8][9][10]. It is well established that palladium-based catalysts have been widely used in homogeneous and heterogeneous catalysis due to their several outstanding properties that combine between those of single metal atoms and other bulk metals [11][12][13][14][15][16]. In order to design new compounds with tailored chemical and

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“…Over the past few decades, micro-reaction technology has been emerged as an ideal route newly adopted approach could achieve a significant improvement via using safer micro-reactor processes [17][18][19][20][21][22][23][24][25][26]. This will definitely improve the capability of producing smaller scale synthetic chemicals on demand and on site at which those products are urgently needed as well [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Pd-Fe3O4/RGO: a Highly Active and Magnetically Recyclable Catalyst for Suzuki Cross Coupling Reaction using a Microfluidic Flow Reactor

Elazab

Siamaki

Gupton

et al. 2019

Bull. Chem. React. Eng. Catal.

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There are several crucial issues that need to be addressed in the field of applied catalysis. These issues are not only related to harmful environmental impact but also include process safety concerns, mass and heat transfer limitations, selectivity, high pressure, optimizing reaction conditions, scale-up issues, reproducibility, process reliability, and catalyst deactivation and recovery. Many of these issues could be solved by adopting the concept of micro-reaction technology and flow chemistry in the applied catalysis field. A microwave assisted reduction technique has been used to prepare well dispersed, highly active Pd/Fe3O4 nanoparticles supported on reduced graphene oxide nanosheets (Pd-Fe3O4/RGO), which act as a unique catalyst for Suzuki cross coupling reactions due to the uniform dispersion of palladium nanoparticles throughout the surface of the magnetite -RGO support. The Pd-Fe3O4/RGO nanoparticles have been shown to exhibit extremely high catalytic activity for Suzuki cross coupling reactions under both batch and continuous reaction conditions. This paper reported a reliable method for Suzuki cross-coupling reaction of 4-bromobenzaldehyde using magnetically recyclable Pd/Fe3O4 nanoparticles supported on RGO nanosheets in a microfluidic-based high throughput flow reactor. Organic synthesis can be performed under high pressure and temperature by using a stainless steel micro tubular flow reactor under continuous flow reaction conditions. Optimizing the reaction conditions was performed via changing several parameters including temperature, pressure, and flow rate. Generally, a scalable flow technique by optimizing the reaction parameters under hightemperature and continuous reaction conditions could be successfully developed.to solve several critical issues in many aspects including organic chemistry and applied catalysis [1][2][3][4][5][6][7][8]. This new technology has created new promising horizons for chemical synthesis and industry via performing chemistry under continuous flow reaction conditions instead of the conventional batch chemistry [9][10][11][12][13][14][15][16]. This

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Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method

Cited by 14 publications

References 26 publications

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄

Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles as an Efficient Nanocomposite for Catalysis Applications in Cross-Coupling Reactions

Pd-Fe3O4/RGO: a Highly Active and Magnetically Recyclable Catalyst for Suzuki Cross Coupling Reaction using a Microfluidic Flow Reactor

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Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method

Cited by 14 publications

References 26 publications

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co3O4

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co3O4

Polyvinylpyrrolidone - Reduced Graphene Oxide - Pd Nanoparticles as an Efficient Nanocomposite for Catalysis Applications in Cross-Coupling Reactions

Pd-Fe3O4/RGO: a Highly Active and Magnetically Recyclable Catalyst for Suzuki Cross Coupling Reaction using a Microfluidic Flow Reactor

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Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄

Microwave-assisted Synthesis and Its Reversible Li-storage Properties of Porous Sheet-like Co₃O₄