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<p>In this study, a mild and efficient solvent-free synthesis strategy was developed for the preparation of <i>N</i>-benzylidenebenzylamine via selective catalytic oxidation of benzylamine with oxygen over a composite MoO<sub>3</sub>/SiO<sub>2</sub> catalyst. The result demonstrate that the 20%MoO<sub>3</sub>/SiO<sub>2</sub> catalyst shows exceptional catalytic performance and stability. Even after five consecutive reaction cycles, the catalyst maintains a benzylamine conversion exceeding 97% and a <i>N</i>-benzylidenebenzylamine selectivity of 96%. Experiment and characterization results reveal that surface hydroxy groups of the MoO<sub>3</sub>/SiO<sub>2</sub> play a critical role in the catalytic activation of benzylamine. Moreover, the existence of oxygen vacancy can facilitate the activation of oxygen. Finally, a plausible reaction pathway for the catalytic oxidation of benzylamine to <i>N</i>-benzylidenebenzylamine over MoO<sub>3</sub>/SiO<sub>2</sub> is proposed. This study employs a cost-effective, simple, and highly active supported MoO<sub>3</sub>/SiO<sub>2</sub> catalyst to selectively oxidize benzylamine into <i>N</i>-benzylidenebenzylamine in a solvent-free environment, demonstrating broad industrial application potential.</p> Graphical abstract <p></p>

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Highly selective preparation of N-benzylidenebenzylamine from solvent-free selective aerobic oxidation of benzylamine over bifunctional MoO3/SiO2 catalyst

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Jinfeng Fu,
  • Jizheng Yi,
  • Wenkai Chen,
  • Wenjin Ni,
  • Qian Yang,
  • Mengwei Su,
  • Xiang Liu

摘要

In this study, a mild and efficient solvent-free synthesis strategy was developed for the preparation of N-benzylidenebenzylamine via selective catalytic oxidation of benzylamine with oxygen over a composite MoO3/SiO2 catalyst. The result demonstrate that the 20%MoO3/SiO2 catalyst shows exceptional catalytic performance and stability. Even after five consecutive reaction cycles, the catalyst maintains a benzylamine conversion exceeding 97% and a N-benzylidenebenzylamine selectivity of 96%. Experiment and characterization results reveal that surface hydroxy groups of the MoO3/SiO2 play a critical role in the catalytic activation of benzylamine. Moreover, the existence of oxygen vacancy can facilitate the activation of oxygen. Finally, a plausible reaction pathway for the catalytic oxidation of benzylamine to N-benzylidenebenzylamine over MoO3/SiO2 is proposed. This study employs a cost-effective, simple, and highly active supported MoO3/SiO2 catalyst to selectively oxidize benzylamine into N-benzylidenebenzylamine in a solvent-free environment, demonstrating broad industrial application potential.

Graphical abstract