5279-51-6Relevant articles and documents
Metalized Carbon Nitrides for Efficient Catalytic Functionalization of CO2
Cheng, Jiajia,Hou, Yuchen,Lian, Kangkang,Xiao, Hongxiang,Lin, Sen,Wang, Xinchen
, p. 1797 - 1808 (2022/02/07)
As an effective approach toward sustainability and global carbon balance, the reductive conversion of CO2 into value-added chemicals is of considerable significance. Here, by simply calcining the mixture of NH4SCN and KCl in an air atmosphere, potassium dopants and negatively charged electron-rich centers are simultaneously introduced into carbon nitride materials via a metalation engineering strategy. The resultant metalized catalysts with deprotonated imide sites and doped potassium ions demonstrate much-enhanced activity for catalyzing CO2 reductive hydrosilylation with excellent conversion and >90% selectivity, whereas the pristine carbon nitride catalyst shows only negligible activity. Both experimental and theoretical results reveal the crucial role of the negatively charged electron-rich centers and potassium dopants in tailoring the energy band positions and electronic structure for the efficient donor-acceptor interaction and much increased driving force for CO2 reduction. The present work offers molecular-level insights into the boosted CO2 reduction activity via engineering the electronic structure of the metalized carbon nitride catalyst and reducing the energy offset between frontier molecular orbitals of CO2 and the catalyst, which can provide a conceptual guide for further development of efficient catalytic CO2 reduction systems.
Method for preparing formamide compound by using MCOF to catalyze CO2 as carbon source at normal temperature and pressure
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Paragraph 0032, (2021/06/09)
The invention provides a method for preparing a formamide compound by using MCOF to catalyze CO2 as a carbon source at normal temperature and pressure, and belongs to the technical field of chemistry and chemical engineering. Under the conditions of normal temperature and normal pressure, CO2 is used as a carbon source to realize N-formylation reaction of various amine substrates. The method has the advantages that the reaction system uses the metal ion-doped two-dimensional covalent organic framework MCOF as the catalyst, CO2 is reduced at normal temperature and normal pressure to provide acyl, high-pressure hydrogen and toxic CO are prevented from being used, and the reaction conditions are mild (normal temperature and normal pressure). According to the method for preparing the formamide, the greenhouse gas carbon dioxide serves as a carbon source, the cost is low, operation is easy, reaction conditions are mild (normal temperature and normal pressure), the yield of the prepared formamide product is excellent (99%), and a green synthesis method is provided for N-acylation reaction.
Catalyst freeN-formylation of aromatic and aliphatic amines exploiting reductive formylation of CO2using NaBH4
Kumar, Arun,Kumar, Yashwant,Mahajan, Dinesh,Sharma, Nidhi,Sharma, Pankaj
, p. 25777 - 25787 (2021/08/05)
Herein, we report a sustainable approach forN-formylation of aromatic as well as aliphatic amines using sodium borohydride and carbon dioxide gas. The developed approach is catalyst free, and does not need pressure or a specialized reaction assembly. The reductive formylation of CO2with sodium borohydride generates formoxy borohydride speciesin situ, as confirmed by1H and11B NMR spectroscopy. Thein situformation of formoxy borohydride species is prominent in formamide based solvents and is critical for the success of theN-formylation reactions. The formoxy borohydride is also found to promote transamidation reactions as a competitive pathway along with reductive functionalization of CO2with amine leading toN-formylation of amines.
