Mg-modified layered erbium hydroxides promoting glucose transformation to lactic acid

IF 5.2 2区 化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2024-09-02 DOI:10.1016/j.cattod.2024.115035
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Abstract

Layered rare earth hydroxides (LREHs) with unique layer structure and tunable properties have shown attractive potentials as heterogeneous catalyst, but is still challenging in biomass valorization towards valuable chemical production due to the poor catalytic activity. Herein, Mg-modified erbium hydroxides (Mg-LErHs) with well-constructed layered structure have been first fabricated, where the properties and structure of Mg-LErHs significantly depend on the proportion of Mg. The results of catalyst characterizations reveal that Mg introduction increases the interlayer spacing and the content of Er(III)-O. Mg modification also hinders the desorption of crystallized H2O and dehydroxylation, thereby increasing the degree of crystallinity and promoting the stability of the catalyst. The activity test indicate that Mg modification greatly promotes the production of lactic acid from monosaccharides, where Mg(5.8)-LErHs affords the highest lactic acid yield of 60.9 %. Mg-LErHs also outperform other Mg-LREHs catalysts for the production of lactic acid. The highest catalytic activity of Mg(5.8)-LErHs are possibly attributed to its highest degree of crystallinity, and the increased layer spacing after Mg modification might have an advantage in facilitating the entry of substrate. The increased Er(III)-O content with high Lewis acidity might facilitate the combination with electronic-rich carbonyl oxygen in substrate. This research may provide a novel strategy to design the layered rare earth catalysts with tunable catalytic activity for biomass valorization.

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促进葡萄糖转化为乳酸的镁改性层状铒氢氧化物
具有独特层状结构和可调特性的层状稀土氢氧化物(LREHs)已显示出作为异相催化剂的诱人潜力,但由于其催化活性较差,在生物质增值以生产有价值的化学品方面仍面临挑战。本文首次制备了具有良好层状结构的镁改性铒氢氧化物(Mg-LErHs),Mg-LErHs 的性质和结构与镁的比例密切相关。催化剂表征结果表明,镁的引入增加了层间距和 Er(III)-O 的含量。镁改性还能阻碍结晶 H2O 的解吸和脱羟基,从而增加结晶度,提高催化剂的稳定性。活性测试表明,镁改性大大促进了单糖乳酸的生产,其中 Mg(5.8)-LErHs 的乳酸产率最高,达到 60.9%。在生产乳酸方面,Mg-LErHs 的性能也优于其他 Mg-LREHs 催化剂。Mg(5.8)-LErHs 催化活性最高的原因可能是其结晶度最高,镁改性后增加的层间距可能有利于底物的进入。高路易斯酸度的 Er(III)-O 含量的增加可能有利于与基质中富含电子的羰基氧结合。这项研究为设计具有可调催化活性的层状稀土催化剂提供了一种新的策略,可用于生物质的提纯。
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来源期刊
Catalysis Today
Catalysis Today 化学-工程:化工
CiteScore
11.50
自引率
3.80%
发文量
573
审稿时长
2.9 months
期刊介绍: Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.
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