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<p>Wax refining transforms raw wax into high-grade product by increasing the uniformity of molecular carbon-chain length and removing impurities. Conventional thermochemical approaches face inherent limitations in effectively reducing carbon-chain dispersity (<i>Ð</i>) due to their non-selective C-C scission in feedstock waxes. This mechanistic constraint consequently necessitates energy-intensive downstream processing involving fractional distillation and purification. Here, we demonstrate a selective solar wax refining method that upgrades the raw polyethylene wax by significantly reducing its <i>Ð</i> from 2.5 to 2.0 in one step with a reaction selectivity beyond 80%, enabled by nanoscale zero-valent iron (nZVI) catalyst and sunlight. At the nZVI-wax interface, photons activate C-H bonds to provide hydrogen atoms, while localized hot spots mediate C-C bonds cleavage via hydrogen atom transfer initiated hydrocracking and concurrent evaporative desorption of fragmented wax product, thereby achieving precise control over carbon-chain dispersity. This work exemplifies the potential in precise and efficient solar refinery.</p>

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Selective solar wax refining with nanoscale zero-valent iron

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月30日

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  • Yifei Sun,
  • Chengliang Mao,
  • Yunjie Zou,
  • Yuqing Hu,
  • Di Yang,
  • Junzhou Xu,
  • Haopeng Pei,
  • Yanbiao Shi,
  • Zipeng Chen,
  • Wendong Wei,
  • Zhihui Ai,
  • Lizhi Zhang

摘要

Wax refining transforms raw wax into high-grade product by increasing the uniformity of molecular carbon-chain length and removing impurities. Conventional thermochemical approaches face inherent limitations in effectively reducing carbon-chain dispersity (Ð) due to their non-selective C-C scission in feedstock waxes. This mechanistic constraint consequently necessitates energy-intensive downstream processing involving fractional distillation and purification. Here, we demonstrate a selective solar wax refining method that upgrades the raw polyethylene wax by significantly reducing its Ð from 2.5 to 2.0 in one step with a reaction selectivity beyond 80%, enabled by nanoscale zero-valent iron (nZVI) catalyst and sunlight. At the nZVI-wax interface, photons activate C-H bonds to provide hydrogen atoms, while localized hot spots mediate C-C bonds cleavage via hydrogen atom transfer initiated hydrocracking and concurrent evaporative desorption of fragmented wax product, thereby achieving precise control over carbon-chain dispersity. This work exemplifies the potential in precise and efficient solar refinery.