通过化学氧化进行催化剂再生可实现长期的电化学二氧化碳减少
Tu N Nguyen1,2, Zhu Chen3, Ali Shayesteh Zeraati4
1Department of Chemical Engineering, Queen's University, Kingston K7L 3N6, ON, Canada.
Journal of the American Chemical Society
|July 7, 2022
概括
铜催化剂的新再生策略显著提高了电化学二氧化碳减排 (ECR) 的稳定性,使得即使在高电流密度下,也能保持对有价值的多碳产品的高选择性.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 电化学二氧化碳减排 (ECR) 的目标是具有高电流密度,产品选择性和稳定性的工业相关性.
- 铜 (Cu) 催化剂在ECR下降解,特别是在高电流密度下,由于结构变化而失去多碳 (C2+) 产品的选择性.
研究的目的:
- 开发和展示一种催化剂再生策略,以提高催化剂的运行稳定性.
- 在工业相关条件下实现对C2+产品,特别是乙烯的持续高选择性.
主要方法:
- 实施了一种电解方法,用于催化剂再生的"开启"和"关闭"操作模式.
- 使用一个带有Cu催化剂的流电池在150 mA cm-2和一个3D Cu气体扩散电极在1 A cm-2.
- 研究了最小化的形态变化,Cu原子氧化,盐洗和催化剂温度降低的影响.
主要成果:
- 再生策略显著增加了催化剂的运行寿命,在150 mA cm-2下保持超过200小时的乙烯选择性≥40%.
- 用3D Cu电极在1 A cm-2时达到≥40%的乙烯选择性,稳定超过36小时.
- 从以前被认为是降解的催化剂中证明了高C2+选择性的恢复.
结论:
- 基于的催化剂可以再生,以达到高C2+选择性,即使经历了性能降低.
- "开启"/"关闭"电解策略,结合特定的操作调整,有效地延长了催化剂的寿命和性能.
- 这项工作为稳定和选择性的二氧化碳转化为有价值产品提供了可行的途径.
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