Formation and catalytic performance of supported ni nanoparticles via self‐reduction of hybrid NiAl‐LDH/C composites

Xiang, Xu; Bai, Lu; Feng, Li

doi:10.1002/aic.12189

Cited by 31 publications

(18 citation statements)

References 55 publications

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“…The Ni2p spectra were deconvoluted into three contributions at ~853.3, ~856.8, and ~862.5 eV in the Ni2p 3/2 region, which were assigned to the metallic Ni 0 , the Ni 2+ species in NiO and the satellite, respectively [ 33 ]. The existence of Ni 2+ species could be due to the easy oxidation of metallic Ni, which inevitably contact with the air during the sample preparation and settlement [ 22 ]. Compared to the Ni catalysts, the binding energy of Ni 0 and Ni 2+ (Ni2p 3/2 ) in the NiPt-0.2% had a little shift of 0.1–0.2 eV towards a lower value.…”

Section: Resultsmentioning

confidence: 99%

“…No obvious agglomeration of Ni NPs was observed although the Ni loading was very high (36%–39%). This highlighted the advantages of the precursor method from LDH/carbon hybrid owing to the lattice anchoring effect of metal ions in the layers of LDH [ 22 , 25 ]. The Pt-modified Ni NPs were more active for adsorbing and cleaving H 2 molecules than the pristine Ni NPs during reduction of 4-NP, owing to a higher electron density of NiPt active sites [ 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…In the previous work, we prepared supported Ni catalysts via self-reduction of hybrid NiAl-layered double hydroxide/carbon (NiAl-LDH/C) composites [ 22 ]. The composites were assembled via crystallization of LDH in combination with simultaneous carbonization of glucose under hydrothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Activity of Supported Ni Catalysts Promoted by Pt for Rapid Reduction of Aromatic Nitro Compounds

et al. 2016

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To improve the activities of non-noble metal catalysts is highly desirable and valuable to the reduced use of noble metal resources. In this work, the supported nickel (Ni) and nickel-platinum (NiPt) nanocatalysts were derived from a layered double hydroxide/carbon composite precursor. The catalysts were characterized and the role of Pt was analysed using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS) mapping, and X-ray photoelectron spectroscopy (XPS) techniques. The Ni2+ was reduced to metallic Ni0 via a self-reduction way utilizing the carbon as a reducing agent. The average sizes of the Ni particles in the NiPt catalysts were smaller than that in the supported Ni catalyst. The electronic structure of Ni was affected by the incorporation of Pt. The optimal NiPt catalysts exhibited remarkably improved activity toward the reduction of nitrophenol, which has an apparent rate constant (Ka) of 18.82 × 10−3 s−1, 6.2 times larger than that of Ni catalyst and also larger than most of the reported values of noble-metal and bimetallic catalysts. The enhanced activity could be ascribed to the modification to the electronic structure of Ni by Pt and the effect of exposed crystal planes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Enhanced Activity of Supported Ni Catalysts Promoted by Pt for Rapid Reduction of Aromatic Nitro Compounds

et al. 2016

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“…Moreover, Zhang and co‐authors found that hexagonal phase Au nanowire‐cubic phase Ru nanorods heterostructures exhibit significantly improved electrocatalytic hydrogen evolution reaction performance compared with that of common hexagonal phase Ru/C catalyst . As one class of important functional materials, metal Ni has two kinds of crystal phases. One is the thermodynamic stable face centered cubic (fcc) phase, and the other is the metastable hexagonal close packed (hcp) phase .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenation of Nitrophenols by Cubic and Hexagonal Phase Unsupported Ni Nanocrystals

et al. 2019

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The catalytic hydrogenation of nitrophenols to aminophenols by diverse catalysts has attracted much attention owing to its potential applications in wastewater purification, fine chemicals and pharmaceutical fields. Though great progress has been achieved, the catalytic hydrogenation of nitrophenols by different crystal phase structured Ni nanocrystals (NCs) has not been investigated until now. Here, the face centered cubic (fcc) Ni and hexagonal close packed (hcp) Ni NCs are controllably synthesized, and employed as the catalysts for hydrogenation of nitrophenols at ambient pressure by using NaBH 4 as the hydrogen carrier. The experimental results reveal that both fcc and hcp Ni NCs can catalyze hydrogenation of nitrophenols to related aminophenols. But the hcp Ni NCs exhibit much higher catalytic activity than fcc Ni NCs no matter which nitrophenols is used. Moreover, both hcp and fcc Ni NCs can be recycled at least ten times without obvious loss of activity, showing an exceptional durability that comparable or even superior to supported Ni catalysts. Deduced from the kinetics and XPS analyses, the higher catalytic activity of hcp Ni NCs is attributed to the more richness of active sites on their surfaces in relative to that of fcc Ni NCs. This work may shed some light on design and development of advanced hydrogenation catalysts based on crystal phase engineering.

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“…However, application of CNTs as well as LDHs as fillers in polymers is limited, as pristine CNTs have a tendency to agglomerate whereas pristine LDHs remain as layered stacks unless they are modified . Recently, three‐dimensional CNT–LDH hybrid nanomaterials have been formulated via hybridizing one‐dimensional nanotubes and two‐dimensional LDH flakes by in situ growth of CNTs on LDHs, co‐precipitation method, hydrothermal method, wet mixing and dry grinding of CNTs and LDHs . These hybrids find potential applications in the fields of hydrogen storage, electro‐catalysis or photodegradation of dyes .…”

Section: Introductionmentioning

confidence: 99%

Assembly of layered double hydroxide on multi‐walled carbon nanotubes as reinforcing hybrid nanofiller in thermoplastic polyurethane/nitrile butadiene rubber blends

Roy

Srivastava

Pionteck

et al. 2015

Polymer International

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An efficient approach has been applied to assemble MgAl layered double hydroxide onto pristine carbon nanotubes using sodium dodecylsulfate. The assembling process and formation of such hybrid nanostructures were established using X‐ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. Subsequently, the hybrid was used as nanofiller in the development of high‐performance thermoplastic polyurethane/acrylonitrile butadiene rubber (1:1 w/w) blend nanocomposites. Measurements of mechanical and dynamic mechanical properties show that tensile strength, elongation at break and storage modulus improve significantly by 171%, 1.8 times and 241% in a blend with 0.50 wt% loading of hybrid filler. Thermogravimetric analysis shows that the thermal stability of the blend with 0.50 wt% hybrid filler compared to neat material is maximally improved by 20 °C determined at 50% weight loss. Differential scanning calorimetry shows the maximum enhancement in melting temperature (7 °C) and crystallization temperature (31 °C) due to significant nucleation efficiency of the filler, homogeneous dispersion and strong interfacial interaction between polymer matrix and filler. © 2015 Society of Chemical Industry

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Formation and catalytic performance of supported ni nanoparticles via self‐reduction of hybrid NiAl‐LDH/C composites

Cited by 31 publications

References 55 publications

Enhanced Activity of Supported Ni Catalysts Promoted by Pt for Rapid Reduction of Aromatic Nitro Compounds

Enhanced Activity of Supported Ni Catalysts Promoted by Pt for Rapid Reduction of Aromatic Nitro Compounds

Catalytic Hydrogenation of Nitrophenols by Cubic and Hexagonal Phase Unsupported Ni Nanocrystals

Assembly of layered double hydroxide on multi‐walled carbon nanotubes as reinforcing hybrid nanofiller in thermoplastic polyurethane/nitrile butadiene rubber blends

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