Recently, the team of Deng Dehui, a researcher at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has realized the electrocatalytic carbon monoxide high-selectivity direct preparation of ethylene. The research results were published in "German Applied Chemistry".
Ethylene is an important basic organic chemical raw material. Currently, the industry mainly uses the method of high-temperature cracking of naphtha to prepare it. This method usually requires a high temperature of more than 800 degrees Celsius, and also produces exhaust gases such as nitrogen oxides and carbon dioxide, which causes environmental pollution problems. In recent years, researchers have developed non-petroleum pathways to convert carbon monoxide to high-value-added C2-C4 olefins through Fischer-Tropsch synthesis. However, in addition to the harsh conditions such as high temperature and high pressure, this process is based on Fischer-Tropsch synthesis Distribution law, the selectivity of C2 products is often lower than 30%, and generates a large amount of carbon dioxide, causing serious waste of carbon resources.
On the basis of optimizing the copper-based catalyst, the researchers increased the diffusion rate of carbon monoxide by adjusting the hydrophobicity of the electrode, effectively promoting the carbon-carbon coupling process of carbon monoxide molecules on the surface of the copper-based catalyst. By using water as a reducing agent, under a mild condition of normal temperature and pressure, carbon monoxide can be selectively electrocatalyzed to produce ethylene. The Faraday efficiency of carbon monoxide electrocatalytic reduction to ethylene reaches 52.7%. Compared with the traditional Fischer-Tropsch synthesis, there is no carbon dioxide generation in this process. Based on the calculation of carbon monoxide conversion, the selectivity of ethylene production is about 70%, which breaks the 30% selectivity limit of C2 products in Fischer-Tropsch synthesis. (Reporters Liu Wansheng correspondent Chen Ruixue, Gao Hehua)
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