文献类型： 外文期刊
作者： Xu, Xiwei 1 ; Jiang, Enchen 1 ; Lei, Zhiwei 2 ;
作者机构： 1.South China Agr Univ, Coll Mat & Energy, Guangzhou 510640, Guangdong, Peoples R China
2.Guizhou Acad Agr Sci, Guizhou Tea Reasearch Inst, Guiyang 550006, Guizhou, Peoples R China
关键词： Esterification;Guaiacol;Acid-functionalized mesoporous silica;S/Phenyl
期刊名称：RENEWABLE ENERGY （ 2020影响因子：8.001； 五年影响因子：7.435 ）
ISSN： 0960-1481
年卷期： 2018 年 119 卷
收录情况： SCI
摘要： Ester products, obtaining from guaiacol and octanoic acid which were the degeneration products of lignin, were tested over sulfonic acid-functionalized SiO2 materials. The results showed that the functionalized mesoporous SiO2 had a high activity and stability, resulting in ester yield of 62%. The ratio of S/ phenyl played an important role in the activity and stability of SiO2-Phenyl-SO3H. Moreover, the optimal guaiacol to octanoic acid molar ratio is 8:1. The physicochemical, structural, textural and thermal stability characteristics of the synthesized mesoporous catalysts were investigated by X-ray diffraction (XRD), surface area analysis (Brunauer Emmett Teller equation), FT-IR and thermogravimetric analysis (TGA). The result of catalyst characterization and experiment of filtering catalysts from mixture showed that the SO3H- group incorporated with functionalized silica precursors. Moreover, the catalytic results indicated that SO3H-phenyl- group was the active part and the phenyl group increased the hydrophobicity of the catalyst surface, which accelerated the mobility of water, shifted the equilibrium, protected the acid sites and enhanced the activity of catalysts. (C) 2017 Elsevier Ltd. All rights reserved.
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