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Modulation of Brønsted and Lewis Acid Centers for NixCo3−xO4 Spinel Catalysts: Towards Efficient Catalytic Conversion of Lignin

Rational design and construction of catalysts with regulable active sites for selective cleavage of lignin to produce aromatic monomers remain challenging. Herein, the authors report a new strategy for tuning the active sites of tetrahedral centers (Lewis acid sites) and octahedral centers (Brønsted...

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Published in:Advanced functional materials 2022-04, Vol.32 (15), p.n/a
Main Authors: Qi, Yi, Xiao, Xin, Mei, Yuqing, Xiong, Lingyingzi, Chen, Liheng, Lin, Xuliang, Lin, Zhan, Sun, Shirong, Han, Bing, Yang, Dongjie, Qin, Yanlin, Qiu, Xueqing
Format: Article
Language:English
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Summary:Rational design and construction of catalysts with regulable active sites for selective cleavage of lignin to produce aromatic monomers remain challenging. Herein, the authors report a new strategy for tuning the active sites of tetrahedral centers (Lewis acid sites) and octahedral centers (Brønsted acid sites) in NixCo3−xO4 through tailoring the non‐stoichiometric ratio of Ni and Co. The ratio of Ni and Co is experimentally optimized for the optimal acidic activity of catalytic cracking of lignin when x = 0.2. The Ni0.2Co2.8O4 catalysts achieve an outstanding catalytic conversion (up to 81 wt%) for the lignin cleavage and excellent selective cleavage into aromatic monomers (up to 90.30 wt%), which is mainly attributed to the optimized electron rearrangement, adjustable active sites, and synergistic effect between these two active sites. This work provides a new concept to rationally design solid acid catalysts for the efficient conversion of lignin. The NixCo3−xO4 spinel catalysts are prepared with different Ni:Co ratio, and the excellent lignin catalytic cleavage performance is attributed to the synergistic effect of Ni and Co‐located in the Brewster and Lewis acid sites of the spinel catalyst tetrahedra and octahedra.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202111615