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<p>Palladium (Pd) has exceptional H<sub>2</sub> adsorption capacity and has been used as an adsorptive filler in mixed matrix membranes (MMMs) to enhance H<sub>2</sub> separation performance. However, a high Pd loading (20 wt%–60 wt%) is impractical due to cost. In this study, highly dispersed Pd nanoclusters are confined within the channels of mesoporous silica nanoparticles (MSNs), largely improving Pd atom utilization for facilitating H<sub>2</sub> transport while greatly reducing Pd loading content. MMMs prepared by mixing Pd@MSN with polybenzimidazole matrix, corresponding to a very low Pd loading of 0.6 wt%–3.0 wt%, exhibit much improved H<sub>2</sub>/CO<sub>2</sub> separation performance. Specifically, an MMM containing only 2.5 wt% Pd shows mixed-gas separation performance of 302.6 barrer of H<sub>2</sub> permeability and 16.3 of H<sub>2</sub>/CO<sub>2</sub> selectivity at 120 °C, largely surpassing the latest 150 °C upper bound. Our work demonstrates the enormous potential for applying Pd-based MMMs in gas separation by reducing noble metal loading by nearly two orders of magnitude.</p>

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Ultralow loading of engineered palladium nanoclusters in polymeric membranes for high permeability hydrogen separation

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Yining Liao,
  • Xichen Yin,
  • Yu Zhang,
  • Feng Zhang,
  • Muyan Jia,
  • Zhenggong Wang,
  • Michael D. Guiver,
  • Jian Jin,
  • Qiming Sun

摘要

Palladium (Pd) has exceptional H2 adsorption capacity and has been used as an adsorptive filler in mixed matrix membranes (MMMs) to enhance H2 separation performance. However, a high Pd loading (20 wt%–60 wt%) is impractical due to cost. In this study, highly dispersed Pd nanoclusters are confined within the channels of mesoporous silica nanoparticles (MSNs), largely improving Pd atom utilization for facilitating H2 transport while greatly reducing Pd loading content. MMMs prepared by mixing Pd@MSN with polybenzimidazole matrix, corresponding to a very low Pd loading of 0.6 wt%–3.0 wt%, exhibit much improved H2/CO2 separation performance. Specifically, an MMM containing only 2.5 wt% Pd shows mixed-gas separation performance of 302.6 barrer of H2 permeability and 16.3 of H2/CO2 selectivity at 120 °C, largely surpassing the latest 150 °C upper bound. Our work demonstrates the enormous potential for applying Pd-based MMMs in gas separation by reducing noble metal loading by nearly two orders of magnitude.