The depolymerization of alkali lignin was investigated over several nitrate modified commercially hydrotalcites catalysts via hydrothermal depolymerization strategy in this study. The obtained results demonstrated that nickel nitrate modified hydrotalcites (HTCs) exhibits excellent catalytic performance to dissociation of C–C and C–O bonds linkage of alkali lignin to yield aromatics. The bio-oil yield increased to 87.9% with 5%Ni-rhHTCs as catalysts from 65.3% with rhHTCs as catalysts, and guaiacol and guaiacol derivatives were found to be the main composition and the highest monomers yield of 35.2 wt% was achieved. It was also found that the characteristic structure of HTCs was restored during rehydration and the structure of rhHTCs was not changed during the preparation of catalyst, but the basic site tensity and distribution are evidently influenced by the loaded metal nitrate and thus promised the excellent catalytic performance of the modified catalyst.

本研究通过水热解聚策略，在几种硝酸盐改性的工业水滑石催化剂上研究了碱木质素的解聚。所得结果表明，硝酸镍改性的水滑石（HTC）对碱性木质素的C-C和C-O键的键解离显示出极好的催化性能，从而产生芳族化合物。以5％Ni-rhHTCs为催化剂的生物油收率从以rhHTCs为催化剂的65.3％增加到87.9％，发现愈创木酚和愈创木酚衍生物是主要成分，单体收率最高，达到35.2 wt％。还发现，在水合过程中，HTC的特征结构得以恢复，在制备催化剂过程中，rhHTC的结构没有改变，