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<p>Methyl glycolate has broad potential applications in fine chemical fields such as pharmaceuticals, cosmetics, coatings, and serves as an important intermediate in organic synthesis. A series of hexagonal boron nitride supported Ag catalysts for hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) were elaborately investigated. Ag was loaded onto oxygen-rich hexagonal boron nitride (Oh-BN) and commercial hexagonal boron nitride (Mh-BN) to prepare the Ag/Oh-BN and Ag/Mh-BN catalysts by ammonia evaporation method. Under the conditions of a temperature of 200 ℃, a hydrogen-to-ester molar ratio of 100, and a weight hourly weight space velocity of 0.6&#xa0;h⁻¹, the yield of MG for the Ag/Oh-BN catalyst was 94.6%, while that for the Ag/Mh-BN catalyst was only 41.6%. The catalysts were comprehensively analyzed using a variety of characterization techniques such as BET, ICP, XRD, XPS, TEM, FTIR, H<sub>2</sub>-TPR, and NH<sub>3</sub>-TPD. The results showed that the Ag/Oh-BN catalyst exhibits smaller particle sizes and higher binding energy compared to the Ag/Mh-BN catalyst. The higher binding energy of Ag in Ag/Oh-BN arised from the hybridization between p orbitals of O atom in B₂O₃ and d-orbitals of Ag atom, leading to partial electron transfer from Ag to B₂O₃. In addition, incorporating a controlled amount of B₂O₃ into commercial hexagonal boron nitride (Mh-BN) produced the Ag/Mh-BN|xB₂O₃ catalyst. The Ag particle size and electronic environment in this catalyst closely resembled those of the Ag/Oh-BN catalyst, providing further evidence of the critical role of B₂O₃.</p>

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Effects of Boron Oxide on Ag/BN Catalyst for the Hydrogenation of Dimethyl Oxalate To Methyl Glycolate

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Jin-Xiang Wang,
  • Lu-Yang Qiao,
  • Shan-Shan Zong,
  • Xin-Yi Cao,
  • Lu-Qi Hu,
  • Zhang-Feng Zhou,
  • Yuan-Gen Yao

摘要

Methyl glycolate has broad potential applications in fine chemical fields such as pharmaceuticals, cosmetics, coatings, and serves as an important intermediate in organic synthesis. A series of hexagonal boron nitride supported Ag catalysts for hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) were elaborately investigated. Ag was loaded onto oxygen-rich hexagonal boron nitride (Oh-BN) and commercial hexagonal boron nitride (Mh-BN) to prepare the Ag/Oh-BN and Ag/Mh-BN catalysts by ammonia evaporation method. Under the conditions of a temperature of 200 ℃, a hydrogen-to-ester molar ratio of 100, and a weight hourly weight space velocity of 0.6 h⁻¹, the yield of MG for the Ag/Oh-BN catalyst was 94.6%, while that for the Ag/Mh-BN catalyst was only 41.6%. The catalysts were comprehensively analyzed using a variety of characterization techniques such as BET, ICP, XRD, XPS, TEM, FTIR, H2-TPR, and NH3-TPD. The results showed that the Ag/Oh-BN catalyst exhibits smaller particle sizes and higher binding energy compared to the Ag/Mh-BN catalyst. The higher binding energy of Ag in Ag/Oh-BN arised from the hybridization between p orbitals of O atom in B₂O₃ and d-orbitals of Ag atom, leading to partial electron transfer from Ag to B₂O₃. In addition, incorporating a controlled amount of B₂O₃ into commercial hexagonal boron nitride (Mh-BN) produced the Ag/Mh-BN|xB₂O₃ catalyst. The Ag particle size and electronic environment in this catalyst closely resembled those of the Ag/Oh-BN catalyst, providing further evidence of the critical role of B₂O₃.