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<p>This study demonstrates the successful use of polyimide (PI) as a support material to fabricate hierarchical porous V<sub>2</sub>O<sub>5</sub>@PI composite materials via hydrothermal synthesis followed by calcination. PI support exhibited a distinctive honeycomb-like porous structure. V<sub>2</sub>O<sub>5</sub> loading induced a remarkable morphology evolution. The <b>VO50</b> catalyst (50&#xa0;wt% V<sub>2</sub>O<sub>5</sub> loading) exhibited a “flower-like” microsphere structure composed of assembled nanosheets. XPS analysis confirmed the coexistence of V<sup>4+</sup> and V<sup>5+</sup> species in <b>VO50</b>. Both specific surface area and pore volume were found to decrease gradually with increasing V<sub>2</sub>O<sub>5</sub> loading, likely due to the blockage of pores by vanadium species. The developed V<sub>2</sub>O<sub>5</sub>@PI composite materials were applied to the ammoxidation of <i>p</i>-chlorotoluene for the synthesis of <i>p</i>-chlorobenzonitrile. The <b>VO50</b> catalyst exhibited outstanding performance under optimized conditions, achieving a yield of 65.5% and a selectivity of 76.3% toward <i>p</i>-chlorobenzonitrile—both significantly higher than those obtained with the unsupported V<sub>2</sub>O<sub>5</sub> catalyst. The excellent performance of the <b>VO50</b> catalyst could be attributed to its stable flower-like morphology, high specific surface area, high dispersion of vanadium species, and full exposure of active sites. The present study demonstrates that PI can serve as an ideal support for high-performance vanadium-based ammoxidation catalysts. The developed <b>VO50</b> catalyst shows great potential for industrial-scale aromatic hydrocarbon ammoxidation applications.</p> Graphic abstract <p></p>

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Enhanced catalytic performance of V2O5@PI micro-nanocomposites for ammoxidation of p-chlorotoluene

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Yelin Li,
  • Yunyi Liu,
  • Wanjun Tang,
  • Qingliang You,
  • Guangyong Xie

摘要

This study demonstrates the successful use of polyimide (PI) as a support material to fabricate hierarchical porous V2O5@PI composite materials via hydrothermal synthesis followed by calcination. PI support exhibited a distinctive honeycomb-like porous structure. V2O5 loading induced a remarkable morphology evolution. The VO50 catalyst (50 wt% V2O5 loading) exhibited a “flower-like” microsphere structure composed of assembled nanosheets. XPS analysis confirmed the coexistence of V4+ and V5+ species in VO50. Both specific surface area and pore volume were found to decrease gradually with increasing V2O5 loading, likely due to the blockage of pores by vanadium species. The developed V2O5@PI composite materials were applied to the ammoxidation of p-chlorotoluene for the synthesis of p-chlorobenzonitrile. The VO50 catalyst exhibited outstanding performance under optimized conditions, achieving a yield of 65.5% and a selectivity of 76.3% toward p-chlorobenzonitrile—both significantly higher than those obtained with the unsupported V2O5 catalyst. The excellent performance of the VO50 catalyst could be attributed to its stable flower-like morphology, high specific surface area, high dispersion of vanadium species, and full exposure of active sites. The present study demonstrates that PI can serve as an ideal support for high-performance vanadium-based ammoxidation catalysts. The developed VO50 catalyst shows great potential for industrial-scale aromatic hydrocarbon ammoxidation applications.

Graphic abstract