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Room-temperature electrochemical acetylene reduction to ethylene with high conversion and selectivity
Nature Catalysis ( IF 37.8 ) Pub Date : 2021-07-01 , DOI: 10.1038/s41929-021-00640-y
Run Shi , Zeping Wang , Yunxuan Zhao , Geoffrey I. N. Waterhouse , Zhenhua Li , Bikun Zhang , Zhimei Sun , Chuan Xia , Haotian Wang , Tierui Zhang

The selective hydrogenation of acetylene to ethylene in ethylene-rich gas streams is an important process in the manufacture of polyethylene. Conventional thermal hydrogenation routes require temperatures above 100 °C and excess hydrogen to achieve a satisfactory C2H2 conversion efficiency. Here, we report a room-temperature electrochemical acetylene reduction system based on a layered double hydroxide (LDH)-derived copper catalyst that offers an ethylene Faradaic efficiency of up to ~80% and inhibits alkane and hydrogen formation. The system affords an acetylene conversion of over 99.9% at a flow rate of 50 ml min−1 in a simulated gas feed, yielding high-purity ethylene with an ethylene/acetylene volume ratio exceeding 105 and negligible residual hydrogen (0.08 vol.%). These acetylene conversion metrics are superior to most other state-of-the-art strategies. The findings therefore conclusively demonstrate an electrochemical strategy as a viable alternative to current technologies for acetylene-to-ethylene conversions with potential advantages in energy and atom economies.



中文翻译:

具有高转化率和选择性的室温电化学乙炔还原为乙烯

在富含乙烯的气流中将乙炔选择性加氢为乙烯是聚乙烯制造中的一个重要过程。传统的热加氢路线需要高于 100 °C 的温度和过量的氢气才能达到令人满意的 C 2 H 2转化效率。在这里,我们报告了一种基于层状双氢氧化物 (LDH) 衍生的铜催化剂的室温电化学乙炔还原系统,该系统可提供高达约 80% 的乙烯法拉第效率并抑制烷烃和氢气的形成。该系统在模拟气体进料中以 50 ml min -1的流速提供超过 99.9% 的乙炔转化率,产生乙烯/乙炔体积比超过 10 5的高纯度乙烯和可忽略的残余氢(0.08 vol.%)。这些乙炔转化指标优于大多数其他最先进的策略。因此,这些发现最终证明了一种电化学策略作为当前乙炔到乙烯转化技术的可行替代方案,在能源和原子经济方面具有潜在优势。

更新日期:2021-07-01
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