CeO2负载Ni单原子催化木质素氢解

Catalytic Hydrogenation of Lignin Using CeO2 Supported Ni Single Atom Catalyst

中文关键词:  木质素  催化氢解  单原子催化剂  二苯醚

Key Words:lignin  catalytic hydrogenation  single atom catalysts  diphenyl ether

中文摘要:

      将木质素转化为高值化学品是可持续发展的重要途径之一。本研究通过浸渍-热解-还原策略，制备了一种可用于催化木质素氢解的CeO₂负载Ni单原子催化剂Ni₁/CeO₂。研究发现，CeO₂载体丰富的氧空位有利于Ni单原子在CeO₂表面高度分散，同步辐射证明Ni原子可与4个O原子相连形成NiO₄催化活性中心。Ni₁/CeO₂催化剂不仅在催化木质素模型物二苯醚（4-O-5）、苄基苯基醚（α-O-4）和2-苯氧基-1-苯乙醇（β-O-4）的氢解时具备优异活性，而且在催化木质素解聚时展现出良好效果，所得木质素氢解产物具有较好的应用前景。

Abstract:

      Converting lignin into high-value chemicals is one of the important ways for sustainable development. In this study， a CeO₂-loaded Ni single atom catalyst Ni₁/CeO₂ that can be used to catalysis the hydrogenolysis of lignin was prepared by an impregnation-pyrolysis-reduction strategy. It was found that the abundant oxygen vacancies in the CeO₂ supporter facilitated the high dispersion of Ni single atoms on the CeO₂ surface， and synchrotron radiation demonstrated that the Ni atoms could be linked with four O atoms to form the NiO₄ catalytic activity centre. The catalyst Ni₁/CeO₂ not only exhibited excellent activity in catalyzing the hydrogenolysis of lignin model compounds diphenyl ether （4-O-5）， benzyl phenyl ether （α-O-4）， and 2-phenoxy-1-phenylethanol （β-O-4）， but also showed good performance in catalyzing lignin depolymerization， giving the hydrogenolysis products of lignin a good prospect for application.