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<p>Silica nanoparticulate (w-SiO<sub>2</sub>)- and hydroxyapatite nanorod (HAP)-supported metallic Ag catalysts were prepared by the precipitation and subsequent wet chemical reduction method. Metallic Ag nanoparticulates with average particle sizes ranging from 4.8 to 9.3 nm formed and well anchored at the nanosized support surfaces. The particle sizes of metallic Ag nanoparticulates at neutral w-SiO<sub>2</sub> surfaces were smaller than those at basic HAP surfaces. Small-sized metallic Ag nanoparticulates of Ag<sub>0.1−2.0</sub>/w-SiO<sub>2</sub> catalysts exhibited higher catalytic activities towards <i>p</i>-aminophenol in direct hydrogenation of <i>p</i>-nitrophenol with gaseous hydrogen (H<sub>2</sub>) than the large-sized ones of Ag<sub>0.1−2.0</sub>/HAP catalysts. The reaction activation energy on Ag<sub>2.0</sub>/w-SiO<sub>2</sub> catalyst was less than that on Ag<sub>2.0</sub>/HAP catalyst, which discloses that small-sized metallic Ag nanoparticulates could conduct <i>p</i>-nitrophenol hydrogenation by overcoming a lower reaction energy barrier at mild reaction temperatures of 110–170&#xa0;°C.</p>

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Direct hydrogenation of p-nitrophenol with gaseous hydrogen to p-aminophenol catalyzed by silica nanoparticulate- and hydroxyapatite nanorod-supported metallic Ag catalysts under mild reaction conditions

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Qianyu Zhao,
  • Aili Wang,
  • Changqing Li,
  • Xin He,
  • Hengbo Yin

摘要

Silica nanoparticulate (w-SiO2)- and hydroxyapatite nanorod (HAP)-supported metallic Ag catalysts were prepared by the precipitation and subsequent wet chemical reduction method. Metallic Ag nanoparticulates with average particle sizes ranging from 4.8 to 9.3 nm formed and well anchored at the nanosized support surfaces. The particle sizes of metallic Ag nanoparticulates at neutral w-SiO2 surfaces were smaller than those at basic HAP surfaces. Small-sized metallic Ag nanoparticulates of Ag0.1−2.0/w-SiO2 catalysts exhibited higher catalytic activities towards p-aminophenol in direct hydrogenation of p-nitrophenol with gaseous hydrogen (H2) than the large-sized ones of Ag0.1−2.0/HAP catalysts. The reaction activation energy on Ag2.0/w-SiO2 catalyst was less than that on Ag2.0/HAP catalyst, which discloses that small-sized metallic Ag nanoparticulates could conduct p-nitrophenol hydrogenation by overcoming a lower reaction energy barrier at mild reaction temperatures of 110–170 °C.