Flexibility Matters: Cooperative Active Sites in Covalent Organic Framework and Threaded Ionic Polymer

2016 ◽  
Vol 138 (48) ◽  
pp. 15790-15796 ◽  
Author(s):  
Qi Sun ◽  
Briana Aguila ◽  
Jason Perman ◽  
Nicholas Nguyen ◽  
Shengqian Ma
Keyword(s):  
Active Sites ◽  
Ionic Polymer ◽  
Covalent Organic Framework ◽  
Organic Framework

scholarly journals N-Heterocyclic Carbene Functionalized Covalent Organic Framework for Transesterification of Glycerol with Dialkyl Carbonates

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 423
Author(s):  
Yuying Chai ◽  
Yaling Li ◽  
Hui Hu ◽  
Chaoyuan Zeng ◽  
Shenglin Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Active Sites ◽  
Covalent Organic Framework ◽  
Heterogeneous Catalytic ◽  
Dialkyl Carbonates ◽  
Dialkyl Carbonate ◽  
Catalytic Active Sites ◽  
Catalytic Reactivity ◽  
Organic Framework

The development of a heterogeneous catalyst through the combination of novel carrier and powerful catalytic active sites is of particular interest. Herein, the successful integration of an N-Heterocyclic carbene (NHC) moiety into a covalent organic framework (COF) was achieved by coupling 4,4′,4′′,4′′′-(pyrene-1,3,6,8-tetrayl) tetraaniline (PyTTA) and equimolar 5,6-bis(4-formylphenyl)-1-methyl-1H-benzimidazole (IM) and 2′3′5′6′-tetrafluoro-[1,1′:4′,1′′-terphenyl]-4,4′-dicarbaldehyde (4F) followed by ionization with 1-bromobutane (C4H9Br) and then deprotonation upon addition of a base. The resulting material exhibited promising heterogeneous catalytic activity towards transesterification reaction of glycerol with dialkyl carbonate. Moreover, good recyclability granted no substantial loss of activity upon five cycles. Combination of COFs and NHCs might synergize their characteristics, thus providing more possibilities for creating new patterns of catalytic reactivity.

Modifiable diyne-based covalent organic framework: a versatile platform for in situ multipurpose functionalization

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39150-39158 ◽  
Author(s):  
Chiyao Bai ◽  
Meicheng Zhang ◽  
Bo Li ◽  
Xiaosheng Zhao ◽  
Shuang Zhang ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Active Sites ◽  
Functional Materials ◽  
Building Blocks ◽  
Covalent Organic Framework ◽  
Organic Framework

A COF material (TCD) containing diynes as both building blocks and active sites was prepared by microwave irradiation and employed as a versatile platform for the preparation of diverse functional materials.

Platinum Single Atoms Anchored on a Covalent Organic Framework: Boosting Active Sites for Photocatalytic Hydrogen Evolution

ACS Catalysis ◽  
2021 ◽  
pp. 13266-13279
Author(s):  
Pengyu Dong ◽  
Yan Wang ◽  
Aicaijun Zhang ◽  
Ting Cheng ◽  
Xinguo Xi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Active Sites ◽  
Photocatalytic Hydrogen Evolution ◽  
Covalent Organic Framework ◽  
Single Atoms ◽  
Organic Framework

Efficient dinitrogen fixation on porous covalent organic framework/carbon nanotubes hybrid at low overpotential

2021 ◽  
pp. 2151027
Author(s):  
Qiming Yu ◽  
Hongming Wang
Keyword(s):  
Carbon Nanotubes ◽  
Active Sites ◽  
Rational Design ◽  
Ammonia Synthesis ◽  
Theoretical Calculations ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Covalent Organic Framework ◽  
Organic Framework

Electrocatalytic nitrogen reduction under ambient conditions is a promising approach for ammonia synthesis, but it is challenging to develop highly efficient electrocatalysts. In this work, a hybrid of covalent organic framework (COF) and carbon nanotubes (CNTs) are developed for efficient nitrogen electroreduction with a high faradaic efficiency (FE) of 12.7% at 0.0 V versus reversible hydrogen electrode (RHE) and a remarkable production rate of ammonia up to 8.56 [Formula: see text]g h[Formula: see text] mg[Formula: see text] at –0.2 V versus RHE. Experiments and theoretical calculations reveal that Ni centers are active sites for NH3 synthesis, while the [Formula: see text]–[Formula: see text] stacking between COF-366-Ni and conductive CNTs scaffold results in the rapid interfacial charge transfer. This investigation provides new insights on the rational design of organic–inorganic porous hybrids for efficient nitrogen conversion and ammonia synthesis at ambient conditions.

Sign in / Sign up

Export Citation Format

Share Document