Monomeric vanadium oxide: a very efficient species for promoting aerobic oxidative dehydrogenation of N-heterocycles. (15th December 2020)

• Record Type: Journal Article
• Authors: Xie, Zhenbing; Chen, Bingfeng; Zheng, Lirong; Peng, Fangfang; Liu, Huizhen; Han, Buxing
• Is Part Of: New journal of chemistry. Volume 45:Number 1(2021)
• Page Start: 431
• Page End: 437
• Publication Date: 2020-12-15
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj04708b
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The isolated monomeric VO4 species, controlled by natural ligand tartaric acid, in the VO x /NbO y @C catalysts exhibited excellent performances and good recyclability in the dehydrogenation of N-heterocycles. Abstract : Monomeric active species are very interesting in heterogeneous catalysis. In this work, we proposed a method to prepare VO x –NbO y @C catalysts, which involve the one-pot hydrothermal synthesis of inorganic/organic hybrid materials containing V/Nb followed by thermal treatment under a reducing atmosphere. The prepared catalysts were characterized using different techniques, such as high-angle annular dark-field scanning transmission electron microscopy and X-ray absorption fine structure spectroscopy. It was shown that monomeric VO x species were dispersed homogeneously in the catalysts. The VO x –NbO y @C catalysts displayed high performance in the aerobic oxidative dehydrogenation of N-heterocycles to aromatic heterocycles. It was demonstrated that the selectivity of reaction over the catalyst with a very small amount of V (0.07 wt%) was much higher than that over the NbO y @C, and the catalyst also exhibited excellent stability in the reaction. The detailed study indicated that monomeric VO2 species were the most effective for promoting the reaction.