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<p>The performance of graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>)-based cobalt (Co) catalysts (Co-g-C<sub>3</sub>N<sub>4</sub>, Co@g-C<sub>3</sub>N<sub>4</sub>) for the hydroesterification of diisobutylene (DIB) was evaluated. In this study, graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) was synthesized by that thermal decomposition of urea, melamine and thiourea in a muffle furnace. The results showed that the optimal reaction conditions were CO pressure 8.0&#xa0;MPa, reaction temperature 150&#xa0;°C and reaction time 10&#xa0;h. When Co<sub>2</sub>(CO)<sub>8</sub>-g-C<sub>3</sub>N<sub>4</sub> in situ catalyst was used, the conversion of DIB was 94.6% and the selectivity to methyl isononanoate was 90.0%. Similarly, in order to solve the problem of poor reusability of the catalyst, Co(OAc)<sub>2</sub>@g-C<sub>3</sub>N<sub>4</sub> catalyst system prepared by impregnation method was studied. Under the same reaction conditions for 12&#xa0;h, only 72.0% conversion of DIB and 89.6% selectivity to methyl isononanoate were obtained, but the catalytic performance was obviously improved compared with in situ catalyst. The catalysts were characterized by scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), N<sub>2</sub> adsorption–desorption isotherm and so on. In addition, the two catalyst systems are suitable for the hydroesterification reaction of various terminal olefins, and exhibit excellent recovery performance and thermal stability.</p> Graphical abstract <p></p>

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Study on the preparation of cobalt catalyst and its catalytic reaction of diisobutene hydroesterification

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Heyuan Song,
  • Zhaoxiong Tian,
  • Fanyu Zhao,
  • Kunyao Zhang,
  • Rui Ding,
  • Daming Sun

摘要

The performance of graphitic carbon nitride (g-C3N4)-based cobalt (Co) catalysts (Co-g-C3N4, Co@g-C3N4) for the hydroesterification of diisobutylene (DIB) was evaluated. In this study, graphite carbon nitride (g-C3N4) was synthesized by that thermal decomposition of urea, melamine and thiourea in a muffle furnace. The results showed that the optimal reaction conditions were CO pressure 8.0 MPa, reaction temperature 150 °C and reaction time 10 h. When Co2(CO)8-g-C3N4 in situ catalyst was used, the conversion of DIB was 94.6% and the selectivity to methyl isononanoate was 90.0%. Similarly, in order to solve the problem of poor reusability of the catalyst, Co(OAc)2@g-C3N4 catalyst system prepared by impregnation method was studied. Under the same reaction conditions for 12 h, only 72.0% conversion of DIB and 89.6% selectivity to methyl isononanoate were obtained, but the catalytic performance was obviously improved compared with in situ catalyst. The catalysts were characterized by scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), N2 adsorption–desorption isotherm and so on. In addition, the two catalyst systems are suitable for the hydroesterification reaction of various terminal olefins, and exhibit excellent recovery performance and thermal stability.

Graphical abstract