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

作者：Qi, Yi; Xiao, Xin; Mei, Yuqing; Xiong, Lingyingzi; Chen, Liheng; Lin, Xuliang; Lin, Zhan; Sun, Shirong; Han, Bing; Yang, Dongjie; Qin, Yanlin^*; Qiu, Xueqing^*

来源：Advanced Functional Materials, 2022, 32(15): 2111615.

DOI：10.1002/adfm.202111615

• Bronsted acid
• Lewis acid
• lignin
• spinel oxides
• cleavage
• heterogeneous catalysis

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 (Bronsted 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.

• 单位
  广东工业大学