Chloride-mediated selective electrosynthesis of ethylene and propylene oxides at high current density
Chloride-mediated selective electrosynthesis of ethylene and propylene oxides at high current density
复制标题
DOI：
10.1126/science.aaz8459
复制
发表时间：
2020-06-12
期刊：
影响因子：
56.9
通讯作者：
Sargent, Edward H.
中科院分区：
文献类型：
--
作者：
Leow, Wan Ru;Lum, Yanwei;Sargent, Edward H.
化学品生产消耗大量能源，占全球碳排放的很大一部分。利用可再生电力生产所需化合物的电化学系统为化工行业降低碳排放提供了一条途径。环氧乙烷是世界上生产最丰富的商品化学品之一，因为它在塑料工业中很重要，特别是在制造聚酯和聚对苯二甲酸乙二醇酯方面。我们应用了一个扩展的非均相界面，在阳极使用氯化物作为氧化还原介质，以促进乙烯选择性部分氧化成环氧乙烷。我们实现了电流密度为每平方厘米1安培，法拉第效率接近70%，产品特异性接近97%。当以每平方厘米300毫安的电流运行100小时时，系统始终保持71(+/- 1)%的法拉第效率。
Chemicals manufacturing consumes large amounts of energy and is responsible for a substantial portion of global carbon emissions. Electrochemical systems that produce the desired compounds by using renewable electricity offer a route to lower carbon emissions in the chemicals sector. Ethylene oxide is among the world's most abundantly produced commodity chemicals because of its importance in the plastics industry, notably for manufacturing polyesters and polyethylene terephthalates. We applied an extended heterogeneous:homogeneous interface, using chloride as a redox mediator at the anode, to facilitate the selective partial oxidation of ethylene to ethylene oxide. We achieved current densities of 1 ampere per square centimeter, Faradaic efficiencies of similar to 70%, and product specificities of similar to 97%. When run at 300 milliamperes per square centimeter for 100 hours, the system maintained a 71(+/- 1)% Faradaic efficiency throughout.