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Effect of halogen-modification on Ag catalyst for CO2 electrochemical reduction to syngas from NH4HCO3 electrolyte
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2021-09-21 , DOI: 10.1016/j.jece.2021.106415
Huiyi Li 1 , Jianmin Gao 1 , Jingjing Shan 2 , Qian Du 1 , Yu Zhang 1 , Xin Guo 3 , Min Xie 4 , Shaohua Wu 5 , Zhijiang Wang 2
Affiliation  

The crucial technology of combining the excess capacity from power plants and the electrocatalytic reduction method to realize the direct conversion of products from ammonia-based CO2 capture to syngas of CO and H2 is to research and develop catalysts for direct electrochemical NH4HCO3 reduction. The electrochemical performance of halogen (Cl, Br, and I)-modified Ag electrodes by cyclic voltammetry (CV) oxidation and reduction treatment carried out in supersaturated NH4HCO3 electrolyte without CO2 bubbling. All of the halogen-modified catalysts realized the direct reduction of NH4HCO3 to syngas of CO and H2. Among them, the Br-modified Ag catalysts have CO Faradaic efficiency of 74.0% at − 0.5 V versus reversible hydrogen electrode much higher than that of Cl- (38%) and I- (39.8%) modified Ag catalysts. The H2/CO ratio on the Br-modified Ag catalyst is approximately 0–3, which is conducive to the reserve of multi-carbon raw materials and the process of Fischer Tropsch synthesis. Furthermore, the Cl-modified Ag catalyst could control the H2/CO ratio of syngas in a wide range of 0.6–6.0 under low potential (from −0.3 to −0.7 V), which is beneficial to apply to different industrial production.



中文翻译:

卤素改性对Ag催化剂在NH4HCO3电解液中CO2电化学还原合成气的影响

将电厂过剩产能与电催化还原法相结合,实现氨基CO 2捕集产物直接转化为CO和H 2合成气的关键技术是研发直接电化学NH 4 HCO 3催化剂。减少。通过循环伏安法 (CV) 氧化和还原处理在没有 CO 2鼓泡的过饱和 NH 4 HCO 3电解质中进行的卤素(Cl、Br 和 I)修饰的 Ag 电极的电化学性能。所有卤素改性催化剂均实现了NH 4 HCO 3直接还原为CO和H的合成气2 . 其中,Br 修饰的 Ag 催化剂在 - 0.5 V 时对可逆氢电极的 CO 法拉第效率为 74.0%,远高于 Cl- (38%) 和 I- (39.8%) 修饰的 Ag 催化剂。Br改性Ag催化剂上的H 2 /CO比约为0-3,有利于多碳原料的储备和费托合成过程。此外,Cl修饰的Ag催化剂可以在低电位(-0.3至-0.7 V)下将合成气的H 2 /CO比控制在0.6-6.0的范围内,有利于应用于不同的工业生产。

更新日期:2021-09-28
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