Two-dimensional covalent organic frameworks as self-template derived nitrogen-doped carbon nanosheets for eco-friendly metal-free catalysis

Hu, Xiwei; Long, Yu; Fan, Mengying; Yuan, Man; Zhao, Hong; Ma, Jiantai; Dong, Zhengping

doi:10.1016/j.apcatb.2018.11.028

Cited by 163 publications

(97 citation statements)

References 65 publications

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“…The ORR activity of Mg-N-C in acidic condition is also evaluated. In contrast to the poor activity of most metal-free nitrogen-doped carbon-based catalysts in acidic condition 45,46 , Mg-N-C shows excellent performance with E 1/2 up to 790 mV in 0.1 M HClO 4 as shown in Fig. 4g.…”

Section: Resultsmentioning

confidence: 89%

Turning main-group element magnesium into a highly active electrocatalyst for oxygen reduction reaction

et al. 2020

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It is known that the main-group metals and their related materials show poor catalytic activity due to a broadened single resonance derived from the interaction of valence orbitals of adsorbates with the broad sp-band of main-group metals. However, Mg cofactors existing in enzymes are extremely active in biochemical reactions. Our density function theory calculations reveal that the catalytic activity of the main-group metals (Mg, Al and Ca) in oxygen reduction reaction is severely hampered by the tight-bonding of active centers with hydroxyl group intermediate, while the Mg atom coordinated to two nitrogen atoms has the nearoptimal adsorption strength with intermediate oxygen species by the rise of p-band center position compared to other coordination environments. We experimentally demonstrate that the atomically dispersed Mg cofactors incorporated within graphene framework exhibits a strikingly high half-wave potential of 910 mV in alkaline media, turning a s/p-band metal into a highly active electrocatalyst.

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Section: Resultsmentioning

confidence: 89%

Turning main-group element magnesium into a highly active electrocatalyst for oxygen reduction reaction

et al. 2020

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“…It can be clearly seen that the TOF of Pd/MSSs-40 is much higher than those of other catalysts (Figure 5b), which is 2.18-fold, 3.53-fold and 6.0-fold higher than that of Pd/MSSs-75, Pd/MSSs-120 and Pd/MCM-41, respectively. Selective hydrogenation of nitroarenes is an environmentally benign and highly efficient process for producing anilines which are key intermediates for the manufacture of fine chemicals, pharmaceuticals and agrochemicals [34][35][36][37]. In the current study, the catalytic performances of Pdloaded MSSs with different pore lengths were evaluated in the selective transformation of nitrobenzene to aniline.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Silica Nanosheets with Tunable Pore Lengths Supporting Metal Nanoparticles for Enhanced Hydrogenation Reactions

Wang

Ding

2019

Catalysts

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The channel lengths of mesoporous materials have a crucial impact on the catalytic performances of as-loaded active components. However, it remains a challenge to precisely tune the mesochannel length in a wide range from ≤50 nm to 200 nm. In this paper, we developed a top-down strategy, that is to say, crushing hollow microspheres, for preparing mesoporous silica nanosheets (MSSs) with perpendicular mesochannels and tunable thicknesses. Owing to the heterogeneous growth of the mesoporous silica layer on the surfaces of polystyrene microspheres (hard template), it was achieved to regulate the mesochannel length continuously in the range of 20–200 nm. The obtained materials were characterized by X-ray diffraction (XRD), nitrogen sorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effect of channel lengths on the catalytic activity of metal nanoparticles was then investigated in the selective hydrogenation reaction of nitroarenes. It was found that a short channel not only favored dispersing metal nanoparticles uniformly and then avoiding pore blocking, but also improved the accessibility of metal nanoparticles largely during reactions.

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“…Knoevenagel Condensation MPU 95 [91] NC-700 99 [92] NC-700 95 [92] Aldol Condensation LZU-76 73 [21] HHBs-B8T2-Pro 98 [93] Mannich Reaction VO-TAPT-2,3-DHTA COF 98 [94] VO-PyTTA2,3-DHTA COF 71 [94] VO(acac) 2 @CTF9 5 [ 95] Henry Reaction…”

Section: Oxidation and Reduction Reactionmentioning

confidence: 99%

Recent Advances in Covalent Organic Frameworks for Catalysis

Liu

Wang

2020

Chemistry An Asian Journal

121

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Covalent organic frameworks (COFs) as an emerging type of crystalline porousm aterials, have obtained considerable attention recently.T hey have exhibitedd iverse structure and attractive performance in variousc atalytic reactions. It is highly expected to have as ystematic and comprehensive review summing up COFs-derivedcatalysts in homogeneous and heterogeneous catalysis, which is favorable to the judicious design of an efficient catalystf or targeted reaction. Herein, we focus on summarizing recent and significant developments in COFs materials, with an emphasis on both the synthetic strategies andt argetedf unctionalization, and categorize it in accordance with the different types of catalytic reactions.T heir potential catalysis applications are reviewed thoroughly.M oreover,apersonal view aboutt he future developmento fC OFs catalysts with respect to the large-scale production is also discussed.[ + + ] These authors contributed equally to this work.The ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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Two-dimensional covalent organic frameworks as self-template derived nitrogen-doped carbon nanosheets for eco-friendly metal-free catalysis

Cited by 163 publications

References 65 publications

Turning main-group element magnesium into a highly active electrocatalyst for oxygen reduction reaction

Turning main-group element magnesium into a highly active electrocatalyst for oxygen reduction reaction

Mesoporous Silica Nanosheets with Tunable Pore Lengths Supporting Metal Nanoparticles for Enhanced Hydrogenation Reactions

Recent Advances in Covalent Organic Frameworks for Catalysis

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