Abstract Catalytic depolymerization of lignin to produce bio-oil, liquid fuels, and aromatic chemicals in high yields is important for a biorefinery to remain competitive. In this study, undoped and Ni-doped catalysts for depolymerization of rice husk lignin (RHL) were developed and analyzed. The results showed that the catalysts had hydrotalcite-like structures with lamellar morphology. With suitable Ni-doping amount, the catalysts had high activity, thus better promoted the depolymerization of RHL. Among all catalysts, the Ni1/4MgAl catalyst could best promote the cleavage of the β-O-4 aryl ether bond in RHL molecule and thus could substantially increase the yields of bio-oil. The depolymerization catalyzed by this catalyst was also found to be temperature-, time-, and solvent-dependent. This study provides information that can be beneficial to the biorefinery industries and may help promote the valorization of lignin. Graphic Abstract

中文翻译：

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Ni-Mg-Al催化剂有效促进稻壳木质素解聚为生物油

摘要 木质素的催化解聚以高产率生产生物油、液体燃料和芳香族化学品对于生物精炼厂保持竞争力非常重要。在这项研究中，开发和分析了用于解聚稻壳木质素 (RHL) 的未掺杂和镍掺杂催化剂。结果表明，催化剂具有层状形态的类水滑石结构。在合适的Ni掺杂量下，催化剂具有较高的活性，从而更好地促进了RHL的解聚。在所有催化剂中，Ni1/4MgAl催化剂最能促进RHL分子中β-O-4芳基醚键的断裂，从而显着提高生物油的收率。还发现由该催化剂催化的解聚与温度、时间和溶剂有关。这项研究提供了对生物精炼行业有益的信息，并可能有助于促进木质素的价值化。图形摘要