Copper and nickel mixed catalysts obtained by calcination of iron and aluminium hydrotalcites (layered double hydroxides, LDH) have been tested in the conversion of a lignin model dimer in subcritical methanol. Phase distribution and textural properties of the catalysts were characterized by X-ray diffraction Rietveld analysis and N₂ physisorption. The presence of copper was critical for effective hydrogenation, both by direct hydrogen transfer from methanol to aldehyde groups and by reactivity of products from methanol reforming. TPR experiments showed that the hydrogenation activity was promoted by an enhanced reducibility of the Cu-catalysts, related to the presence of other oxide components.

Characterisation of the catalysts after reaction indicated that metallic copper was formed by the reduction of CuO by methanol and that modifications of the oxide catalysts in the reaction medium played a major role in the formation of active sites.

通过铁和铝水滑石（层状双氢氧化物，LDH）的煅烧获得的铜和镍混合催化剂已在木质素模型二聚体在亚临界甲醇中的转化中进行了测试。通过X射线衍射Rietveld分析和N ₂物理吸附来表征催化剂的相分布和织构性质。铜的存在对于有效的氢化至关重要，无论是通过将氢从甲醇直接转移到醛基上，还是通过甲醇重整产物的反应性来进行。TPR实验表明，与其他氧化物组分的存在有关，Cu催化剂还原性的提高促进了氢化活性。

反应后催化剂的表征表明，金属铜是通过甲醇还原CuO形成的，反应介质中氧化物催化剂的改性在活性位点的形成中起主要作用。