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<p>The effect of reduction temperature on the low-temperature hydrogen activation capacity of Cu/SiO<sub>2</sub> prepared by the gel-hydrothermal method and its atmospheric pressure hydrogenation activity is investigated in this work. XPS and FTIR reveal that insufficient reduction of the catalyst occurs at low temperatures. Cu<sup>2+</sup> is completely reduced to lower valence species at temperature above 250&#xa0;°C. XRD and N<sub>2</sub>O titration confirm that the Cu<sup>0</sup> underwent severe agglomeration at reduction temperatures above 300&#xa0;°C, whereas H<sub>2</sub>-TPD confirms that the catalysts reduced at 250–300&#xa0;°C exhibit optimal low-temperature hydrogen activation capacity. Reaction tests show that the efficient low-temperature hydrogen activation of Cu/SiO<sub>2</sub> catalysts is a crucial factor in improving MG yields. The catalyst reduced at 250 ~ 300&#xa0;°C achieved about 90% DMO conversion and 85% MG selectivity at 170&#xa0;°C and 0.1&#xa0;MPa.</p> Graphical Abstract <p></p>

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Promoting Methyl Glycolate Yield Via Low-Temperature H2 Activation in Atmospheric Hydrogenation of Dimethyl Oxalate

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Xian Kan,
  • Peipei Lei,
  • Chao Wang,
  • Qihong Xue,
  • Tianfu Zhang,
  • Jiaming Wang,
  • Jiangang Chen

摘要

The effect of reduction temperature on the low-temperature hydrogen activation capacity of Cu/SiO2 prepared by the gel-hydrothermal method and its atmospheric pressure hydrogenation activity is investigated in this work. XPS and FTIR reveal that insufficient reduction of the catalyst occurs at low temperatures. Cu2+ is completely reduced to lower valence species at temperature above 250 °C. XRD and N2O titration confirm that the Cu0 underwent severe agglomeration at reduction temperatures above 300 °C, whereas H2-TPD confirms that the catalysts reduced at 250–300 °C exhibit optimal low-temperature hydrogen activation capacity. Reaction tests show that the efficient low-temperature hydrogen activation of Cu/SiO2 catalysts is a crucial factor in improving MG yields. The catalyst reduced at 250 ~ 300 °C achieved about 90% DMO conversion and 85% MG selectivity at 170 °C and 0.1 MPa.

Graphical Abstract