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<p>The nickel-aluminum composite oxide was synthesized via the co-precipitation and roasting method, and then we explored the profound effect of reduction temperature during activation on formation and evolution of the Ni/Al<sub>2</sub>O<sub>3</sub> catalysts. Hereon, the hydrogenation of dimethyl terephthalate (DMT) to dimethyl 1,4-cyclohexanedicarboxylate (DMCD) was a probe reaction for the investigation into the structure–activity relationship of the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst. This study leveraged techniques such as TEM, H<sub>2</sub>-TPR, XPS, H<sub>2</sub>-TPD to examine the impact of reduction temperature on the catalyst’s structure and hydrogenation capabilities. The findings demonstrated that as the reduction temperature increased, so did the reduction degree of Ni<sup>2+</sup> in the catalyst and the H<sub>2</sub> adsorption sites. However, excessively high reduction temperatures can lead to the sintering of the Ni<sup>0</sup> particles, thereby increasing grain size, and the optimal reduction temperature was determined to be 550&#xa0;°C. Smaller grain sizes of the Ni<sup>0</sup> particle were particularly suitable for saturation hydrogenation of benzene ring. A DMT conversion of 100% and a DMCD selectivity of 91.3% were obtained over the optimized Ni<sub>2</sub>Al<sub>1</sub>-550 catalyst under the moderate conditions of 150&#xa0;°C and 5&#xa0;MPa.</p> Graphical abstract <p></p>

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Effect of reduction temperature on formation and evolution of Ni/Al2O3 Catalysts for hydrogenation of dimethyl terephthalate to dimethyl 1,4-Cyclohexanedicarboxylate

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Guixian Li,
  • Weiguo Fang,
  • Qi Zhang,
  • Kang Yuan,
  • Xingjun Zhou,
  • Hailong Liu

摘要

The nickel-aluminum composite oxide was synthesized via the co-precipitation and roasting method, and then we explored the profound effect of reduction temperature during activation on formation and evolution of the Ni/Al2O3 catalysts. Hereon, the hydrogenation of dimethyl terephthalate (DMT) to dimethyl 1,4-cyclohexanedicarboxylate (DMCD) was a probe reaction for the investigation into the structure–activity relationship of the Ni/Al2O3 catalyst. This study leveraged techniques such as TEM, H2-TPR, XPS, H2-TPD to examine the impact of reduction temperature on the catalyst’s structure and hydrogenation capabilities. The findings demonstrated that as the reduction temperature increased, so did the reduction degree of Ni2+ in the catalyst and the H2 adsorption sites. However, excessively high reduction temperatures can lead to the sintering of the Ni0 particles, thereby increasing grain size, and the optimal reduction temperature was determined to be 550 °C. Smaller grain sizes of the Ni0 particle were particularly suitable for saturation hydrogenation of benzene ring. A DMT conversion of 100% and a DMCD selectivity of 91.3% were obtained over the optimized Ni2Al1-550 catalyst under the moderate conditions of 150 °C and 5 MPa.

Graphical abstract