Promotion effects of alkali- and alkaline earth metals on catalytic activity of mesoporous Co3O4 for 4-nitrophenol reduction

Mogudi, Batsile M.; Ncube, Phendukani; Bingwa, Ndzondelelo; Mawila, Naphtaly; Mathebula, Shitshembiso; Meijboom, Reinout

doi:10.1016/j.apcatb.2017.06.045

Cited by 72 publications

(29 citation statements)

References 44 publications

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“…Also, an evident correlation was found between the ion‐promoted catalyst‘s reduction temperature and surface basicity with its catalytic performance. Before this, our group had earlier reported that dopants improve catalytic activities on mesoporous Co 3 O 4 considerably [28] . Other works of literature have published the enhanced catalytic efficiency of alkali‐promoted catalysts [29–31] due to the dopants electronic [32] and structural [29,31] effects on the metal oxides.…”

Section: Methodsmentioning

confidence: 95%

“…Before this, our group had earlier reported that dopants improve catalytic activities on mesoporous Co 3 O 4 considerably. [28] Other works of literature have published the enhanced catalytic efficiency of alkali-promoted catalysts [29][30][31] due to the dopants electronic [32] and structural [29,31] effects on the metal oxides. As a continuous study of carbonylation reactions involving CO gas, we are interested in exploring the capability of this ion-promoted gold-cobalt based catalyst for [2 + 2 + 1] cyclization reactions.…”

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confidence: 99%

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Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

et al. 2021

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Surface‐active and highly stable cobalt nanoparticles generated from alkali ion‐promoted gold catalyst for catalyzed carbonylative [2+2+1] cyclization reaction, is described. The gold nanoparticle‘s (AuNPs) role was assumed to dissociate the CO and H2 into atomic species on the catalyst surface by spillover, which in‐situ reduces the robust mesoporous cobalt oxide to metallic cobalt (Co3+→Co2+→Co), as the active catalytic species that catalyzed the reaction; thereby providing up to 93 % yield of cyclopentenone adducts. Prior to this, catalyst pre‐treatment with H2 gas (130 °C, 3 h, 20 atm) was performed to reduce the catalyst. It appeared that the low reducibility temperature and increased surface basicity ascribed to the presence of alkali ion‐promoters in the catalyst revealed a strong correlation with the catalyst activity, for the intra‐ and intermolecular reactions under milder reaction conditions. Thus, a sustainable, highly reusable, and environmentally friendly green catalyst for the carbonylation reaction, such as Pauson‐Khand, was developed.

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Section: Methodsmentioning

confidence: 95%

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confidence: 99%

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

et al. 2021

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“…Notably, with the introduction of Ni@GC, the absorption peak at 400 nm dramatically decreases as the reaction proceeds along with a concomitant increase of an emerging peak as a shoulder at ≈300 nm, at the same time the bright yellow color of the solution vanished quickly within 5 min, addressing the successful conversion of 4‐NP to 4‐AP (Figure b). Moreover, two isosbestic points at 280 and 316 nm are discovered, evidencing the high selectivity of this conversion without generating any byproducts . The reduction product was further confirmed by high performance liquid chromatography (HPLC) analysis.…”

Section: Resultsmentioning

confidence: 64%

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Liu

Wang

et al. 2018

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The search for earth‐abundant, low‐cost, recyclable, multifunctional as well as highly active catalysts remains the most pressing demand for heterogeneous catalytic elimination of pollutants in water environment remediation. Herein, a porous graphitic carbon‐encapsulated Ni nanoparticles (NPs) hybrid (Ni@GC) is designed/constructed by direct pyrolysis of a Ni‐based metal−organic framework (MOF) in N2. The resulting Ni@GC exhibits a unique 3D hierarchical byttneria aspera‐like yolk–shell structure with a high surface area, abundant active sites as well as good microwave (MW)‐absorbing performance. The outstanding MW‐driven oxidation of norfloxacin to inorganic molecules and direct catalytic reduction of 4‐nitrophenol to less toxic and more useful chemical raw material (4‐aminophenol) can originate from the synergistic effects, including the presence of both zero‐valent Ni NPs as the active center and graphitic carbon as the protective layer/electron acceptor as well as unique porous yolk‐void‐shell structure, which facilitates the MW energy‐harvesting and/or rapid mass transfer of the reactant/product in the channels and cavities. Accordingly, the localized surface plasmon resonance–excitation and electronic relay mechanism are proposed to account for the catalytic oxidation/reduction, respectively. This work provides a new strategy for the design/assembly of multifunctional metal@GC hybrids with a unique architecture and elucidates new opportunities for remediation of environmental water.

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“…After addition of Ni/Ni 3 S 2 @C to bright solution, the color of the solution fades up which resulted in the decrease in the adsorption peaks of 4‐nitrophnolate anions with a new peak appeared at 300 nm [Figure (b)] of 4‐AP. Moreover, the isosbestic point demonstrates that single product is formation . Kinetic traces [Figure (b), (c), and (d)] show the UV‐vis absorption spectra of 4‐NP with the reaction time in the presence of S1‐600, S 1 ‐700, and S 1 ‐800, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of Nickel/Heazlewoodite@Carbon Nanosheets and their Superior Catalytic Performance of 4‐Nitrophenol Reduction

Wang

Lü²,

Zhao

et al. 2018

ChemCatChem

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A facile molten salt method was utilized for the synthesis of carbon anchored nickel/heazlewoodite nanoparticles (Ni/ Ni 3 S 2 @C nanosheets) with potassium humate as the carbon and sulfur source and NaCl as template. The morphology, particle size and crystallinity of the products were characterized by various techniques containing TEM, FE-SEM and XRD. Furthermore, the mesoporous Ni/Ni 3 S 2 @C own easy accessibility of active sites and high surface area (149.04 m 2 g À1 ). Thus, the asprepared Ni/Ni 3 S 2 @C exhibited prominent performance for catalytic reduction of 4-nitrophenol (4-NP). Catalytic reduction of other nitrophenols (NPs) were also tested which can prove that the catalyst own selectivity on reduction of NPs. For durability, the property of the catalyst does not decrease obviously after five cycles. More significant correlations concerning effect of activation parameters (E a = 37.21 kJ mol À1 ) on 4-NP reduction were scrutinized and discussed. Hence, we provide a facile method for fabrication of metal/metal sulfide@C which own better dispersity, small dimension and excellent catalytic performance for further studies.

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Promotion effects of alkali- and alkaline earth metals on catalytic activity of mesoporous Co3O4 for 4-nitrophenol reduction

Cited by 72 publications

References 44 publications

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Facile Fabrication of Nickel/Heazlewoodite@Carbon Nanosheets and their Superior Catalytic Performance of 4‐Nitrophenol Reduction

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Promotion effects of alkali- and alkaline earth metals on catalytic activity of mesoporous Co3O4 for 4-nitrophenol reduction

Cited by 72 publications

References 44 publications

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co3O4 (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co3O4 (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Facile Fabrication of Nickel/Heazlewoodite@Carbon Nanosheets and their Superior Catalytic Performance of 4‐Nitrophenol Reduction

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Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions

Stable and Surface‐active Co Nanoparticles Formed from Cation (x) Promoted Au/x‐Co₃O₄ (x=Cs) as Selective Catalyst for [2+2+1] Cyclization Reactions