Catalytic Reduction of p-Nitrophenol Using Chitosan Stabilized Copper Nanoparticles

Tan, Wen-Nee; Bakar, Noor Hana Hanif Abu; Bakar, M. Abu

doi:10.1007/s10562-015-1547-y

Cited by 29 publications

(16 citation statements)

References 37 publications

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“…Reduced with evolution of CO, CO 2 and H 2 O during activation [13] , carbide [48] V Reduced with evolution of CO, CO 2 and H 2 O during activation [13]…”

Section: Fementioning

confidence: 99%

“…[132] It is conceivable that W and Fe behave similar to Mo and that their active forms have similar structures, since they also exhibit an induction period and were shown to form carbidic phases at reaction conditions. [13,48,75,133] Table 2. Information that can be gained using different spectroscopic techniques and the difficulties encountered using them to characterize the Mo/HZSM-5 system.…”

Section: Càh Bond Activationmentioning

confidence: 99%

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Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

et al. 2018

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To secure future supply of aromatics, methane is a commercially interesting alternative feedstock. Direct conversion of methane into aromatics combines the challenge of activating one of the strongest C−H bonds in all hydrocarbons with the selective aromatization over zeolites. To address these challenges, smart catalyst and process design are a must. And for that, understanding the most important factors leading to successful methane C−H bond activation and selective aromatization is needed. In this review, we summarize mechanistic insight that has been gained so far not only for this reaction, but also for other similar processes involving aromatization reactions over zeolites. With that, we highlight what can be learnt from similar processes. In addition, we provide an overview of characterization tools and strategies, which are useful to gain structural information about this particular metal‐zeolite system at reaction conditions. Here we also aim to inspire future characterization work, by giving an outlook on characterization strategies that have not yet been applied for the methane dehydroaromatization catalyst, but are promising for this system.

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“…Reduced with evolution of CO, CO 2 and H 2 O during activation [13] , carbide [48] V Reduced with evolution of CO, CO 2 and H 2 O during activation [13]…”

Section: Fementioning

confidence: 99%

Section: Càh Bond Activationmentioning

confidence: 99%

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

et al. 2018

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“…Free Fe 31 ions are known to show the 2p 1/2 band at about 724 eV and 2p 3/2 band at about 711 eV. 36 When the Fe 31 ions coordinate with COO 2 groups in the F 2 Ac 20 MC gels, the 2p 3/2 band became weak and the 2p 1/2 band disappeared ( Fig. 10).…”

Section: Energy Dissipation Mechanismsmentioning

confidence: 99%

Tough and self‐recoverable hydrogels crosslinked by triblock copolymer micelles and Fe³⁺ coordination

Gao

et al. 2018

J Polym Sci B Polym Phys

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Tough hydrogels have great potentials in soft robotics, artificial muscles, tissue replacement, and so on. Here we introduce novel tough hydrogels crosslinked by triblock copolymer (F127DA) micelles and metal coordination. The gels showed outstanding tensile strength (∼1–11 MPa), toughness (∼4–32 MJ m−3), and excellent self‐recovery properties (∼56.8–87.2% toughness recovery in 9 min at room temperature). The mechanical and self‐recovery properties could be manipulated by varying contents of micelles and/or COO− groups. Dynamic mechanical analysis of the hydrogels revealed apparent activation energy and relaxations for both physical interactions. In situ small‐angle X‐ray scattering measurements on hydrogels upon stretching revealed micelle deformations. XPS measurements on hydrogels before and after stretching revealed significant changes in the binding energy of Fe3+ ions in the gels, suggesting the rupture of coordination bonds. The experimental results strongly suggest a synergistic effect from the micelle‐crosslinking and Fe3+–COO− coordination on the strength, toughness, and self‐recovery of the hydrogels. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 865–876

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“…The dominant peak in the Fe 2p spectrum (2p5/2 band, Figure 3d) at 706.84 eV points to a zero-valent Fe (24.7%), whereas the peak at 707.90 eV (12.4%) points to Fe carbides. [19] Additional peaks in the 2p5/2 band at higher binding energies result from Fe 2þ and Fe 3þ species. Similarly, most of the surface Co atoms were present as Co 2þ and Co 3þ species, as shown in Figure 3e.…”

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

Synergistic Effects of Mo₂C‐NC@Co_xFe_y Core–Shell Nanoparticles in Electrocatalytic Overall Water Splitting Reaction

et al. 2019

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Transition metals (TMs) are highly investigated as nonprecious electrocatalysts for hydrogen evolution (HER) and oxygen evolution (OER) reactions. There is a strong demand for highly efficient and inexpensive catalysts for overall water splitting. Herein, the bimetallic CoxFey alloy nanoparticles encapsulated in a N‐doped graphene shell containing molybdenum carbide (Mo2C) nanoparticles are synthesized by the pyrolysis of cobalt ferrite (CoxFe3−xO4) nanoparticles coated by melamine‐formaldehyde resin cross‐linked with molybdic acid. Molybdic acid not only serves as precursor for the formation of highly dispersed Mo2C nanoparticles in the N‐doped graphene shell but also enhances the thermal stability of the organic shell, resulting in the formation of smaller CoxFey cores. The formation of Mo2C nanoparticles in the graphene shell is promoted by the CoxFe3−xO4 core. Interestingly, the synergistic presence of Mo2C nanoparticles not only enhances the HER activity of the material but also renders a partial breakage of the graphene shell, which increases the surface concentration of OER‐active Co and therefore enhances the OER activity. The as‐prepared TM‐based materials serve as bifunctional catalysts for the overall water splitting and exhibit improved electrocatalytic performances compared to standard cells based on precious metals, with the potentials of 1.53 and 1.60 V at 10 and 20 mA cm−2 in alkaline media, respectively.

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Catalytic Reduction of p-Nitrophenol Using Chitosan Stabilized Copper Nanoparticles

Cited by 29 publications

References 37 publications

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Tough and self‐recoverable hydrogels crosslinked by triblock copolymer micelles and Fe³⁺ coordination

Synergistic Effects of Mo₂C‐NC@Co_xFe_y Core–Shell Nanoparticles in Electrocatalytic Overall Water Splitting Reaction

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Catalytic Reduction of p-Nitrophenol Using Chitosan Stabilized Copper Nanoparticles

Cited by 29 publications

References 37 publications

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Progress in Developing a Structure‐Activity Relationship for the Direct Aromatization of Methane

Tough and self‐recoverable hydrogels crosslinked by triblock copolymer micelles and Fe3+ coordination

Synergistic Effects of Mo2C‐NC@CoxFey Core–Shell Nanoparticles in Electrocatalytic Overall Water Splitting Reaction

Contact Info

Product

Resources

About

Tough and self‐recoverable hydrogels crosslinked by triblock copolymer micelles and Fe³⁺ coordination

Synergistic Effects of Mo₂C‐NC@Co_xFe_y Core–Shell Nanoparticles in Electrocatalytic Overall Water Splitting Reaction