Ma Xinyue, Xu Wenbiao
Faculty of Bioscience Engineering, Jilin Agricultural Science and Technology University, Hanlin Rond, Jilin City 132101, China.
College of Materials Science and Engineering, Beihua University, Jilin City 132013, China.
Polymers (Basel). 2024 Dec 13;16(24):3480. doi: 10.3390/polym16243480.
The efficient utilization of lignin, a pivotal component of lignocellulosic biomass, is crucial for advancing sustainable biorefinery processes. However, optimizing lignin valorization remains challenging due to its intricate structure and susceptibility to undesirable reactions during processing. In this study, we delve into the impact of various pretreatment agents on birch lignin, aiming to enhance its catalytic oxidation and depolymerization under polyoxometalates (POMs) catalysis. Our results reveal that pretreatment with formaldehyde effectively safeguards aryl ether linkages in lignin, leading to a notable increase in aromatic compound yields under POMs catalysis. Furthermore, gel permeation chromatography (GPC) analysis underscores the inhibition of aryl ether linkage hydrolysis upon formaldehyde addition. Gas chromatography-mass spectrometry (GC-MS) analysis demonstrates that formaldehyde pretreatment boosts lignin monomer yield by 2 to 3 times compared to untreated lignin, underscoring the effectiveness of tailored pretreatment strategies. This research underscores the significance of adopting rational pretreatment methods to advance lignin valorization pathways catalyzed by POMs, thereby contributing to the evolution of sustainable biomass conversion technologies.
木质纤维素生物质的关键成分木质素的高效利用，对于推进可持续生物精炼过程至关重要。然而，由于其结构复杂且在加工过程中易发生不良反应，优化木质素增值仍然具有挑战性。在本研究中，我们深入探讨了各种预处理剂对桦木木素的影响，旨在增强其在多金属氧酸盐（POMs）催化下的催化氧化和解聚。我们的结果表明，用甲醛预处理可有效保护木质素中的芳基醚键，导致在POMs催化下芳香族化合物产率显著提高。此外，凝胶渗透色谱（GPC）分析强调了添加甲醛后对芳基醚键水解的抑制作用。气相色谱-质谱联用（GC-MS）分析表明，与未处理的木质素相比，甲醛预处理使木质素单体产率提高了2至3倍，突出了定制预处理策略的有效性。本研究强调了采用合理预处理方法推进POMs催化的木质素增值途径的重要性，从而为可持续生物质转化技术的发展做出贡献。
