Metal oxide-catalyzed ammoxidation of alcohols to nitriles and promotion effect of gold nanoparticles for one-pot amide synthesis

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• 作者：Tamao Ishida^a ; ^c ; ^{tishida@chem.kyushu-univ.jp} ; Hiroto Watanabe^b ; Takashi Takei^b ; ^c ; Akiyuki Hamasaki^a ; ^c ; Makoto Tokunaga^a ; ^c ; Masatake Haruta^b ; ^c ; ^{haruta-masatake@center.tmu.ac.jp}
• 关键词：Metal oxides ; Gold nanoparticles ; Ammoxidation ; Nitrile hydration ; Alcohol
• 刊名：Applied Catalysis A ; General
• 出版年：2012
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：28 May, 2012
• 卷：425-426
• 期：Complete
• 页码：85-90
• 文件大小：470 K

摘要

Transition metal oxides (MnO₂, Co₃O₄, and NiO) are catalytically active for the ammoxidation of alcohols to nitriles. In particular, MnO₂ exhibited remarkably high catalytic activity and selectivity for the ammoxidation of alcohols to produce nitriles. Benzyl alcohol could also be directly converted to benzonitrile by MnO₂ catalyst by the one-pot ammoxidation and the hydration with water which was formed by the first ammoxidation step. The deposition of gold nanoparticles (Au NPs) onto MnO₂ did not enhance the ammoxidation of benzyl alcohol but promoted the hydration of benzonitrile to produce benzamide with high selectivity. In contrast, Au NPs supported on Al₂O₃, CuO, and CeO₂ catalyzed the ammoxidation of benzyl alcohol, whereas these metal oxides themselves were inactive for the ammoxidation or showed low catalytic activity. These results have demonstrated that gold is intrinsically active as a catalyst for the ammoxidation of alcohols.