Scholarlink

<p>The design of high-performance, mild-condition HDO catalysts is a crucial step in the high-value utilization of the conversion of phenol to cyclohexanone. In this paper, the effect of modifier on the catalyst activity was investigated by surface modification of ZrO<sub>2</sub> support by ascorbic acid (AA). The role of water in the reaction solvent was also explored. The results showed that ascorbic acid can etch the surface lattice of the support and generate reactive oxygen vacancies; the OH group can act as an acid site and stabilise the C = O group in cyclohexanone through “acid-base interaction”, thus inhibiting further hydrogenation of cyclohexanone. In addition, the transfer of hydrogen in the aqueous phase facilitated the isomerisation of the enol to cyclohexanone and inhibited the occurrence of side reactions. The Pd/ZrO<sub>2</sub> + AA catalyst resulted in a phenol conversion of 58.3% and a cyclohexanone selectivity of 85.7% in 2&#xa0;h at a water/methanol volume ratio of 2/8. Moreover, the catalyst showed good stability, with no significant decrease in phenol conversion and the selectivity of cyclohexanone remaining at 80.6% after four cycles. This study aimed to provide a new avenue for the high-value utilization of phenol by modulating the catalyst preparation and optimising the reaction system.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ascorbic Acid Enhanced the Performance of Pd/ZrO2 for Efficient Hydrogenation of Phenol in Aqueous Phase

  • 期刊论文

  • 发表日期：

    2025年1月18日

查看全文
  • Yu Wang,
  • Xin Zhang,
  • Shiling Fan,
  • Zhiying Wang,
  • Hao Li

摘要

The design of high-performance, mild-condition HDO catalysts is a crucial step in the high-value utilization of the conversion of phenol to cyclohexanone. In this paper, the effect of modifier on the catalyst activity was investigated by surface modification of ZrO2 support by ascorbic acid (AA). The role of water in the reaction solvent was also explored. The results showed that ascorbic acid can etch the surface lattice of the support and generate reactive oxygen vacancies; the OH group can act as an acid site and stabilise the C = O group in cyclohexanone through “acid-base interaction”, thus inhibiting further hydrogenation of cyclohexanone. In addition, the transfer of hydrogen in the aqueous phase facilitated the isomerisation of the enol to cyclohexanone and inhibited the occurrence of side reactions. The Pd/ZrO2 + AA catalyst resulted in a phenol conversion of 58.3% and a cyclohexanone selectivity of 85.7% in 2 h at a water/methanol volume ratio of 2/8. Moreover, the catalyst showed good stability, with no significant decrease in phenol conversion and the selectivity of cyclohexanone remaining at 80.6% after four cycles. This study aimed to provide a new avenue for the high-value utilization of phenol by modulating the catalyst preparation and optimising the reaction system.

Graphical abstract