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<p>Pd/γ- Al<sub>2</sub>O<sub>3</sub> catalyst for hydrogen oxidation at room temperature was prepared by impregnation of Pd(OH)<sub>2</sub> sol. The prepared catalyst was tested by hydrogen oxidation at room temperature in a closed-loop differential reactor and compared with the catalyst prepared by impregnation of PdCl<sub>2</sub> aqueous solution. The catalysts were characterized by CO chemisorption, UV–vis, and XRD spectroscopy. The presence of Pd(OH)<sub>2</sub> sol in the impregnation solution was confirmed by dynamic light scattering, UV–vis spectroscopy and potential measurements versus pH by electrophoresis. The penetration depth of Pd in the catalyst was measured by a stereomicroscope coupled with a computer and a CCD camera. Compared with the catalyst prepared by impregnation of Pd(OH)<sub>2</sub> sol with the catalyst prepared by impregnation of PdCl<sub>2</sub> aqueous solution, the catalyst was much more active for the same Pd content, because of the high Pd dispersion and the low penetration depth in the catalyst. Pd(OH)<sub>2</sub> sol impregnation can reduce palladium consumption by 40% compared to PdCl<sub>2</sub> aqueous impregnation.</p>

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Preparation of Pd/γ-Al2O3 catalysts for hydrogen oxidation at room temperature by Pd(OH)2 sol impregnation

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Il-Gwan Ri,
  • Kwang-Il Kim,
  • Chol-Ung Kim,
  • Chol-Ho Choe,
  • Jong-Gwa Ri

摘要

Pd/γ- Al2O3 catalyst for hydrogen oxidation at room temperature was prepared by impregnation of Pd(OH)2 sol. The prepared catalyst was tested by hydrogen oxidation at room temperature in a closed-loop differential reactor and compared with the catalyst prepared by impregnation of PdCl2 aqueous solution. The catalysts were characterized by CO chemisorption, UV–vis, and XRD spectroscopy. The presence of Pd(OH)2 sol in the impregnation solution was confirmed by dynamic light scattering, UV–vis spectroscopy and potential measurements versus pH by electrophoresis. The penetration depth of Pd in the catalyst was measured by a stereomicroscope coupled with a computer and a CCD camera. Compared with the catalyst prepared by impregnation of Pd(OH)2 sol with the catalyst prepared by impregnation of PdCl2 aqueous solution, the catalyst was much more active for the same Pd content, because of the high Pd dispersion and the low penetration depth in the catalyst. Pd(OH)2 sol impregnation can reduce palladium consumption by 40% compared to PdCl2 aqueous impregnation.