1. Insight into the catalytic mechanism of N-doped carbon nanotubes supported CoNi bimetallic catalyst boosts the base-free oxidative esterification of furfural.
- Author
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Yu, Xin, Huang, Xiaoyi, Jia, Wenlong, Chen, Jiahong, Yang, Shibo, Peng, Lincai, Sun, Yong, Tang, Xing, Zeng, Xianhai, Yang, Shuliang, Li, Zheng, Xu, Feng, and Lin, Lu
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CARBON nanotubes , *CATALYSTS , *ESTERIFICATION , *FURFURAL , *HYDROGEN - Abstract
• Heterogeneous Co 0.8 Ni 0.2 -CNTs was effective for oxidative esterification of furfural. • >99% yield of methyl furoate was obtained with great formation rate of 1980 μmol·g cat −1·h−1. • The cooperation of Co-N x and Ni-N x sites is responsible for oxidative esterification. • The Ni-N x sites contributed to the adsorption of the aldehyde group in furfural. • Doping of Ni boosts the basicity of the catalyst and accelerates hydrogen abstraction. Developing active and affordable catalysts for the transformation of biomass platform into value-added chemicals have drawn tremendous attention. Herein, we have successfully prepared a CoNi bimetallic nitrogen-doped carbon nanotubes (CNTs) catalyst, manifesting outstanding catalytic performance for furfural oxidative esterification under base-free conditions (methyl furoate yield >99%), and great recyclability (5th recycle). Importantly, an impressive methyl furoate formation rate of around 1980 μmol methyl furoate ·g cat −1·h−1 was achieved, to the best of our knowledge, the result represents one of the highest methyl furoate formation rates. The results revealed that the doping of Ni into the Co x Ni y -CNTs catalyst brings about more active sites. Fourier transforms infrared spectrometer results suggest that the Ni-N x sites are responsible for the adsorption of the substrate with tilted or vertical adsorption. Furthermore, the introduction of Ni facilitates the improvement of basicity, which in turn promotes the β-hydride elimination. All of these active sites boost the overall activity of the catalyst for the oxidative esterification of furfural. Synopsis : The fabrication of N-doped carbon nanotubes supported CoNi bimetallic catalyst with enhanced O 2 activation ability and hydrogen abstraction ability presents excellent activity for base-free oxidative esterification of furfural. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
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