Liquid phase alkylation of anisole by benzyl alcohol catalyzed on alumina-supported niobia

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• 作者：Marcus H.C. de la Cruz ; Mona A. Abdel-Rehim ; Angela S. Rocha ; Joã ; o F.C. da Silva ; Arnaldo da Costa Faro Jr. ; Elizabeth R. Lachter
• 关键词：Niobic acid ; Alkylation ; Friedel-Crafts reaction ; Solid acid catalyst ; Niobia-alumina
• 刊名：Catalysis Communications
• 出版年：2007
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：November 2007
• 卷：8
• 期：11
• 页码：1650-1654
• 文件大小：263 K

摘要

The catalytic activity of Nb₂O₅, Al₂O₃ and alumina-supported niobia were evaluated in the alkylation reaction of anisole with benzyl alcohol in liquid phase. Alumina exhibited low activity and poor selectivity for alkylates. In contrast, high activities and selectivities to alkylated products were obtained with the niobia and niobia-alumina. The latter could be re-used after drying at 773 K. The catalysts were characterized by conventional techniques such as XRD, FTIR of adsorbed pyridine and nitrogen physisorption. Alumina presents only Lewis acidity, nevertheless niobium based catalysts present Brønsted and Lewis acid sites. The acidity trends are compatible with the activity patterns.