Lignin valorisation towards added-value products has become a relevant topic to consolidate a future circular bioeconomy. In this context lignin oxidation to C₄ dicarboxylic acids (C₄-DCA) by catalytic wet peroxide oxidation is emerging as a value-added strategy, supported by the extensive use of these building blocks in several industrial fields. In this work, lignins from different sources and processes (Indulin AT, Lignol, alkali and E. globulus kraft lignins) were oxidised using H₂O₂ and titanium silicalite-1 catalyst (TS-1) under different operating conditions (temperature, pH, time, H₂O_2, and TS-1 load). Indulin AT was the lignin leading to the highest succinic acid yield (11.3 wt%), and TS-1 catalyst enhanced its production four times over the non-catalysed reaction. Malic acid was also produced at high yields, especially for Lignol lignin. The other lignins (E. globulus kraft, and alkali lignins) also produced these C₄ acids but at lower yields. The catalyst remained stable at the used experimental conditions, and showed potential to be reused for several cycles without being deactivated. Overall, the catalytic conversion of lignin to C₄-DCA can help to guide the pathway to renewable chemicals production.

木质素对附加值产品的增值已成为巩固未来循环生物经济的相关主题。在这种情况下，通过催化湿过氧化物氧化将木质素氧化为 C ₄二羧酸 (C ₄ -DCA) 正在成为一种增值策略，这得到了这些构建模块在多个工业领域的广泛使用的支持。在这项工作中，从不同的源和进程（INDULIN AT，Lignol公司，碱木质素蓝桉牛皮纸木质素）使用H被氧化的₂ ö ₂和钛硅质岩催化剂1不同的操作条件（温度，pH值下（TS-1） , 时间, H ₂ O _2,和 TS-1 负载）。Indulin AT 是导致最高琥珀酸产率 (11.3 wt%) 的木质素，TS-1 催化剂的产量比非催化反应提高了四倍。苹果酸的产量也很高，尤其是对于 Lignol 木质素。其他木质素（E. globulus kraft和碱性木质素）也产生这些 C ₄酸，但产率较低。该催化剂在使用的实验条件下保持稳定，并显示出可重复使用多个循环而不失活的潜力。总的来说，木质素催化转化为 C ₄ -DCA 有助于指导可再生化学品生产的途径。