From woody biomass extractives to health-promoting substances: Selective oxidation of the lignan hydroxymatairesinol to oxomatairesinol over Au, Pd, and Au-Pd heterogeneous catalysts

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• 作者：Olga A. Simakova^a ; ^b ; Elena Smolentseva^c ; Miguel Estrada^d ; Elena V. Murzina^a ; Sergey Beloshapkin^e ; Stefan M. Willfö ; r^f ; Andrey V. Simakov^c ; Dmitry Yu. Murzin^a ; ^{dmurzin@abo.fi}
• 关键词：Gold ; Palladium ; Sol&ndash ; gel ; Selective oxidation ; Biomass ; Lignans ; Oxomatairesinol (oxoMAT) ; Hydroxymatairesinol (HMR)
• 刊名：Journal of Catalysis
• 出版年：2012
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：July, 2012
• 卷：291
• 期：Complete
• 页码：95-103
• 文件大小：633 K

摘要

Aerobic selective oxidation of the naturally occurring lignan hydroxymatairesinol (HMR) to another lignan oxomatairesinol (oxoMAT) was carried out at 70 掳C and atmospheric pressure over different gold and gold-palladium catalysts. Several groups of gold catalysts were prepared: Au ion-exchanged on Y-zeolites promoted by Cu, Ni, Fe; Au and Au-Pd supported via deposition-precipitation with urea - DPU on metal oxides (magnesia, alumina, ceria, zirconia, and lanthanum oxide); and Au on alumina, and alumina-ceria-zirconia mixed oxides prepared by the sol-gel method. The catalysts were characterized by ICP-AES, TEM, XPS and UV-Vis techniques. Acidity of supports was studied by an FTIR method using pyridine as a probe molecule. No catalytic activity was detected in case of gold catalysts based on zeolites. Au and Au-Pd catalysts supported on metal oxides showed different activity and selectivity in the HMR transformation depending on the support acidity/basicity and the active phase. The highest activity was reached over Au supported on alumina with big transport pores displaying 100%selectivity to oxoMAT.