DOI: 10.1016/j.jcou.2018.01.019
Scopus记录号: 2-s2.0-85041482920
论文题名: Selective hydrodeoxygenation of lignin β-O-4 model compounds and aromatic ketones promoted by palladium chloride with acidic CO2/MeOH system
作者: Cao Y. ; Ma R. ; Wang N. ; Wang M.-Y. ; Li X.-D. ; He L.-N.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 24 起始页码: 328
结束页码: 333
语种: 英语
英文关键词: Carbon dioxide
; Hydrodeoxygenation
; In situ acid
; Lignin
; Palladium
Scopus关键词: Aromatic compounds
; Aromatization
; Carbon
; Carbon dioxide
; Catalysts
; Chlorine compounds
; Hydrogenolysis
; Hydrolysis
; Ketones
; Lignin
; Palladium
; Palladium compounds
; Waste disposal
; Acidic catalysts
; Aromatic ketones
; Hydrodeoxygenation
; Hydroxyl groups
; Palladium chloride
; Reaction efficiency
; Reaction medium
; Reductive cleavage
; In situ processing
; Carbon Dioxide
; Ketones
; Lignins
; Palladium Compounds
英文摘要: Selective hydrogenolysis is a crucial challenge for lignin valorization. A PdCl2-catalyzed hydrogenolysis of C–OH bond of various lignin β-O-4 alcohol model compounds was developed for preparation of corresponding phenethoxybenzene in 78–98% isolated yield. Notably, the introduction of low-pressure CO2 (1 MPa) remarkably improves the reaction efficiency and selectivity of phenethoxybenzene. Neither over-reduction of aromatic ring nor further debenzylation was detected. This is understandable that the in situ methylcarbonic acid generated from CO2 and methanol acts as an acidic catalyst and enhances the leaving ability of hydroxyl group of β-O-4 alcohols. Besides, the present PdCl2/CO2/MeOH catalyst system proved to be effective for reductive cleavage of C–O bonds of β-O-4 ketones, producing ethylbenzenes accompanied with phenols in high yields. Furthermore, this protocol could also be extended to selective hydrodeoxygenation of the carbonyl group to methylene in aromatic ketones. As a sound reaction medium, such in situ CO2/MeOH acidic system could be inherently neutralized by depressurizing CO2, providing feature advantages for simple post-processing and none waste disposal. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111957
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory and Institute of Elemento-Organic Chemistry, Collaborative Innovation Centre of Chemical Science and Engineering, Nankai University, Tianjin, 300071, China; School of Chemistry & Chemical Engineering, Shaanxi University of Science & Technology, Xian, 710000, China
Recommended Citation:
Cao Y.,Ma R.,Wang N.,et al. Selective hydrodeoxygenation of lignin β-O-4 model compounds and aromatic ketones promoted by palladium chloride with acidic CO2/MeOH system[J]. Journal of CO2 Utilization,2018-01-01,24