Qian Xu , Ling-Ping Xiao , Qiang Wang , Li-Long Zhang , Run-Cang Sun
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引用次数: 0
摘要
通过还原催化降解(RCD)策略将木质纤维素加氢分解成可再生酚类单体受到成本和适用性的限制,因此需要开发成本可控、适用性更强的有效催化剂。在此,我们报告了 CuO/CeO2 催化剂的制备过程,该催化剂用于木质纤维素的还原催化降解,以生产具有不同侧链的单体酚。该催化剂适用于软木(落叶松和松柏)和硬木(桉树和白杨),产率从 8.8 % 到 31.4 % 不等,可在控制成本的同时获得一定的单体产率。实验结果表明,CuO/CeO2 催化剂的酸性和碱性位点有助于金属位点解聚木质素。值得注意的是,机理研究表明,甲氧基化过程发生在脂肪族羟基上。此外,氢气和催化剂的协同作用显示出很高的氢解活性,这有助于高效的 C - O 键裂解,从而生成目标单体产品。
Efficient hydrogenolysis of woody plant lignin into phenolic compounds over a CuO/CeO2 catalyst
Hydrogenolysis of lignocellulose into renewable phenolic monomers through the reductive catalytic degradation (RCD) strategy is limited by cost and applicability, and there is a need to develop effective catalysts with controlled cost and greater applicability. Herein, we report the fabrication of CuO/CeO2 catalyst toward RCD of lignocellulose for the production of monomeric phenols with different side chains. The catalyst can be adapted to softwoods (Larch and Pinus) and hardwoods (Eucalyptus and Poplar) with yields ranging from 8.8 % to 31.4 %, which afford certain monomer yields while controlling costs. Experimental results demonstrate that the acidic and basic sites of the CuO/CeO2 catalyst assist the metal sites in the depolymerization of lignin. Notably, the mechanistic investigation reveal that the methoxylation process occurs on the aliphatic hydroxyl group. Moreover, the synergistic effects of hydrogen and catalyst exhibit high hydrogenolysis activity, which contributes to the efficient C − O bond scission, thus generating the target monomer products.
期刊介绍:
The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes.
The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods.
The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.