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<p>Photocatalytic C−N coupling offers a promising approach for the sustainable production of amino acids, but the uncontrolled coupling pathway of reaction intermediates limits yield and selectivity. This paper describes a Pd−B diatomic catalyst that can selectively catalyze the photosynthesis of glycine via C−N coupling reaction between waste poly(ethylene terephthalate)-derived ethylene glycol and nitrate, achieving a glycine yield of 2.9 mmol g<sub>cat</sub><sup>−1</sup> h<sup>−1</sup> with a selectivity of 92%. Mechanistic investigations reveal that ethylene glycol is photo-oxidized to glycolaldehyde at the hole-rich B site, while nitrate is photo-reduced to NH<sub>4</sub><sup>+</sup>/NH<sub>3</sub>&#xa0;at the electron-rich Pd site. Subsequently, glycolaldehyde undergoes C−N coupling with NH<sub>4</sub><sup>+</sup>/NH<sub>3</sub>, and further photo-oxidized to form glycine. The Pd−B diatomic site more effectively stabilizes the glycolaldehyde intermediate, resulting in a more favorable C−N coupling pathway than metal oxide and enhancing glycine selectivity. Thus, we show a catalytic system for selective glycine photosynthesis by precisely regulating the reaction pathways of key intermediates.</p>

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Glycine photosynthesis via C−N coupling of waste plastic and nitrate over diatomic Pd−B catalyst

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月20日

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  • Zongyang Ya,
  • Mei Li,
  • Donglong Fu,
  • Yu Zheng,
  • Ruhan Wei,
  • Hao Wang,
  • Kangning Zhang,
  • Dong Xu,
  • Zixuan Zhang,
  • Xue Zhang,
  • Shen Yan,
  • Hua Wang,
  • Shengbo Zhang,
  • Jinlong Gong

摘要

Photocatalytic C−N coupling offers a promising approach for the sustainable production of amino acids, but the uncontrolled coupling pathway of reaction intermediates limits yield and selectivity. This paper describes a Pd−B diatomic catalyst that can selectively catalyze the photosynthesis of glycine via C−N coupling reaction between waste poly(ethylene terephthalate)-derived ethylene glycol and nitrate, achieving a glycine yield of 2.9 mmol gcat−1 h−1 with a selectivity of 92%. Mechanistic investigations reveal that ethylene glycol is photo-oxidized to glycolaldehyde at the hole-rich B site, while nitrate is photo-reduced to NH4+/NH3 at the electron-rich Pd site. Subsequently, glycolaldehyde undergoes C−N coupling with NH4+/NH3, and further photo-oxidized to form glycine. The Pd−B diatomic site more effectively stabilizes the glycolaldehyde intermediate, resulting in a more favorable C−N coupling pathway than metal oxide and enhancing glycine selectivity. Thus, we show a catalytic system for selective glycine photosynthesis by precisely regulating the reaction pathways of key intermediates.