Scholarlink

<p>The semihydrogenation of acetylene impurities in crude ethylene streams to produce polymer-grade ethylene is important for the polyethylene industry. Photocatalytic reduction offers a promising solution in terms of sustainability. However, the current state of photocatalytic acetylene semihydrogenation systems has shown limited activity. Here we report a metal-catalysed hydrogen atom transfer pathway to promote photocatalytic acetylene semihydrogenation via rapid formation of cobalt hydride species. Applying a <i>N</i>,<i>N</i>′-bis(salicylidene)ethylenediamine cobalt catalyst with an electron-donating ligand that energetically favours cobalt hydride formation in pure acetylene yields excellent acetylene-to-ethylene reduction performance with near-unity selectivity, a turnover number of 29,401 and a turnover frequency of 2.14 s<sup>−1</sup>. Most importantly, we engineered a continuous-flow photoreactor, by which crude ethylene containing 1.10 vol% acetylene can be steadily converted into polymer-grade ethylene continuously over 50 h.</p><p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Cobalt hydride-mediated photocatalytic semihydrogenation of acetylene impurities for continuous-flow production of polymer-grade ethylene

  • 期刊论文

  • 发表日期：

    2025年7月22日

查看全文
  • Haojie Dai,
  • Yuhan Wang,
  • Kailin Wang,
  • Hao Kang,
  • Xiangyang Chen,
  • Bei Ding,
  • Xudan Chen,
  • Ying Du,
  • Lize Dong,
  • Wen Zhong,
  • Ning Sun,
  • Pengyu Liu,
  • Chunyang Yu,
  • Jingyuan Ma,
  • Fei Song,
  • Yongfeng Hu,
  • Shan Tang,
  • Yannan Liu,
  • Wenfeng Jiang,
  • Yuanhai Su,
  • Jun Li,
  • Yongfeng Zhou

摘要

The semihydrogenation of acetylene impurities in crude ethylene streams to produce polymer-grade ethylene is important for the polyethylene industry. Photocatalytic reduction offers a promising solution in terms of sustainability. However, the current state of photocatalytic acetylene semihydrogenation systems has shown limited activity. Here we report a metal-catalysed hydrogen atom transfer pathway to promote photocatalytic acetylene semihydrogenation via rapid formation of cobalt hydride species. Applying a N,N′-bis(salicylidene)ethylenediamine cobalt catalyst with an electron-donating ligand that energetically favours cobalt hydride formation in pure acetylene yields excellent acetylene-to-ethylene reduction performance with near-unity selectivity, a turnover number of 29,401 and a turnover frequency of 2.14 s−1. Most importantly, we engineered a continuous-flow photoreactor, by which crude ethylene containing 1.10 vol% acetylene can be steadily converted into polymer-grade ethylene continuously over 50 h.