Enhancing Hydrogen Production from the Photoreforming of Lignin.
Enhancing Hydrogen Production from the Photoreforming of Lignin.
复制标题
提高木质素光重整的氢产量。
DOI：
10.1002/cplu.202300411
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发表时间：
2024
期刊：
影响因子：
3.4
通讯作者：
Aljohani M
中科院分区：
文献类型：
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作者：
Aljohani M
木质纤维素生物质的光转化被广泛认为是一项具有挑战性但又是生产增值化学品和可再生氢气（H2）的关键技术。在本研究中，有机溶剂木质素在中性水溶液中，在0.1wt%Pt/TiO 2（P25）催化剂上，用紫外线A（UVA）光进行光重整制氢。 使用木质素的系统的H2产量（~4.8 μmol gcat-1h-1）与使用羟基化/甲氧基化芳族模型化合物的相当（即， 愈创木酚和苯酚，4.8-6.6 μmol gcat−1h−1），明显低于纤维素光重整的产物（~62.8 μmol gcat−1h−1）。 研究了苯酚及其中间产物邻苯二酚、对苯二酚和苯醌的光重整反应，探讨了苯酚在厌氧光重整条件下的氧化机理.与本文中所展示的木质素的催化剂中毒和低光重整活性相关的问题已经通过实施催化剂通过厌氧和好氧条件循环的过程来减轻。这种策略使定期再生的光催化剂，导致在H2生产的木质素的光重整的三倍增强。
Photoreforming of lignocellulose biomass is widely recognised as a challenging but key technology for producing value‐added chemicals and renewable hydrogen (H2). In this study, H2production from photoreforming of organosolv lignin in a neutral aqueous solution was studied over a 0.1 wt % Pt/TiO2(P25) catalyst with ultraviolet A (UVA) light. The H2production from the system employing the lignin (~4.8 μmol gcat−1h−1) was comparable to that using hydroxylated/methoxylated aromatic model compounds (i. e., guaiacol and phenol, 4.8–6.6 μmol gcat−1h−1), being significantly lower than that from photoreforming of cellulose (~62.8 μmol gcat−1h−1). Photoreforming of phenol and reaction intermediates catechol, hydroquinone and benzoquinone were studied to probe the mechanism of phenol oxidation under anaerobic photoreforming conditions with strong adsorption and electron transfer reactions lowering H2production from the intermediates relative to that from phenol. The issues associated with catalyst poisoning and low photoreforming activity of lignins demonstrated in this paper have been mitigated by implementing a process by which the catalyst was cycled through anaerobic and aerobic conditions. This strategy enabled the periodic regeneration of the photocatalyst resulting in a threefold enhancement in H2production from the photoreforming of lignin.