乙炔
乙烯
催化作用
氢
材料科学
电化学
选择性
无机化学
化学工程
化学
电极
有机化学
物理化学
工程类
作者
Run Shi,Zeping Wang,Yunxuan Zhao,Geoffrey I. N. Waterhouse,Zhenhua Li,Bikun Zhang,Zhimei Sun,Chuan Xia,Haotian Wang,Tierui Zhang
出处
期刊:Nature Catalysis
[Springer Nature]
日期:2021-07-01
卷期号:4 (7): 565-574
被引量:160
标识
DOI:10.1038/s41929-021-00640-y
摘要
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. The selective semihydrogenation of acetylene in ethylene-rich gas streams is an important process in the manufacture of polyethylene, which is traditionally performed thermocatalytically. Now, a room-temperature electrochemical acetylene reduction system with excellent performance is presented.
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