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

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Modulation of Brønsted and Lewis Acid Centers for NixCo3−xO4 Spinel Catalysts: Towards Efficient Catalytic Conversion of Lignin
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-01-05 , DOI: 10.1002/adfm.202111615
Yi Qi ₁ , Xin Xiao ₁ , Yuqing Mei ₂ , Lingyingzi Xiong ₁ , Liheng Chen _{1,

3} , Xuliang Lin _{1,

3} , Zhan Lin _{1,

3} , Shirong Sun _{1,

3} , Bing Han ₄ , Dongjie Yang ₅ , Yanlin Qin _{1,

3} , Xueqing Qiu _{1,

5}

Affiliation

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 Ni_xCo₃₋_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 Ni_0.2Co_2.8O₄ 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.

中文翻译：

NixCo3−xO4 尖晶石催化剂的 Brønsted 和 Lewis 酸中心的调制：实现木质素的高效催化转化

具有可调节活性位点的催化剂的合理设计和构造用于选择性裂解木质素以产生芳族单体仍然具有挑战性。在此，作者报告了一种通过调整 Ni 和 Co 的非化学计量比来调整Ni _x Co ₃₋_x O ₄中四面体中心（Lewis 酸位）和八面体中心（Brønsted 酸位）的活性位点的新策略。当x = 0.2时，Ni 和 Co 的比例针对木质素催化裂化的最佳酸性活性进行了实验优化。Ni _0.2 Co _2.8 O ₄催化剂实现了出色的木质素裂解催化转化率（高达 81 wt%）和优异的选择性裂解成芳族单体（高达 90.30 wt%），这主要归功于优化的电子重排、可调节的活性位点以及两者之间的协同效应。这两个活跃的网站。该工作为合理设计用于木质素高效转化的固体酸催化剂提供了新的思路。

更新日期：2022-01-05

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