Immobilization of polyoxometalates on protonated graphitic carbon nitride: A highly efficient and reusable catalyst for the synthesis of pyridine-N-oxides

2022 ◽  
Vol 518 ◽  
pp. 112067
Author(s):  
Mingji Jia ◽  
Menglu Cai ◽  
Xiaozhong Wang ◽  
Yangyang Fang ◽  
Wenhui Cao ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
Highly Efficient

scholarly journals Band Engineering and Morphology Control of Oxygen-Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yunyan Wu ◽  
Pan Xiong ◽  
Jianchun Wu ◽  
Zengliang Huang ◽  
Jingwen Sun ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Physical Adsorption ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Hydrogen Evolution ◽  
Band Engineering ◽  
Highly Efficient

AbstractGraphitic carbon nitride (g-C3N4)-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-C3N4, such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-C3N4 nanosheet (OCN) with an improved surface area of 148.5 m2 g−1 is fabricated by the multiple thermal treatments under the N2/O2 atmosphere, wherein the C–O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-C3N4. The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g−1 h−1 for ~ 20 h, which is over four times higher than that of g-C3N4 (850.1 μmol g−1 h−1) and outperforms most of the reported g-C3N4 catalysts.

scholarly journals A facile and highly efficient transfer hydrogenation of ketones and aldehydes catalyzed by palladium nanoparticles supported on mesoporous graphitic carbon nitride

2019 ◽  
Vol 44 (1-2) ◽  
pp. 14-19
Author(s):  
Bilal Nişancı ◽  
Ziya Dağalan
Keyword(s):  
Carbon Nitride ◽  
Glass Tube ◽  
Pd Nanoparticles ◽  
Graphitic Carbon ◽  
Transfer Hydrogenation ◽  
Graphitic Carbon Nitride ◽  
Reusable Catalyst ◽  
Hydrogenation Reactions ◽  
High Yields ◽  
Benzaldehyde Derivatives

A novel transfer hydrogenation methodology for the reduction of ketones (14 examples) and benzaldehyde derivatives (12 examples) to the corresponding alcohols using Pd nanoparticles supported on mesoporous graphitic carbon nitride (mpg-C3N4/Pd) as a reusable catalyst and ammonia borane as a safe hydrogen source in an aqueous solution MeOH/H2O (v/v = 1/1) is described. The catalytic hydrogenation reactions were conducted in a commercially available high-pressure glass tube at room temperature, and the corresponding alcohols were obtained in high yields in 2–5 min. Moreover, the presented transfer hydrogenation protocol shows partial halogen selectivity with bromo-, fluoro-, and chloro-substituted carbonyl analogs. In addition, the present catalyst can be reused up to five times without losing its efficiency, and scaling-up the reaction enables α-methylbenzyl alcohol to be produced in 90% isolated yield.

A hybrid transition metal nanocrystal-embedded graphitic carbon nitride nanosheet system as a superior oxygen electrocatalyst for rechargeable Zn–air batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (38) ◽  
pp. 19644-19654
Author(s):  
Wen-Jun Niu ◽  
Jin-Zhong He ◽  
Ya-Ping Wang ◽  
Qiao-Qiao Sun ◽  
Wen-Wu Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Carbon Nitride ◽  
Solid Phase ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Highly Efficient ◽  
Pyrolysis Method ◽  
Carbon Nitride Nanosheets

A general solid-phase pyrolysis method was developed to synthesize the hybrid transition metals nanocrystals-embedded graphitic carbon nitride nanosheets (M-CNNs) as highly efficient oxygen electrocatalyst for rechargeable Zn–air batteries (ZABs).

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