电荷极化促进电化学尿素合成通过共同减少CO2和酸盐在稀释度与一个单位碳选择性
Zhihao Feng1, Lu-Hua Zhang1, Yabo Guo1
1National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, P. R. China.
Angewandte Chemie (International ed. in English)
|February 16, 2025
概括
这项研究引入了一种新的电催化剂 (Cu@Fe-N-C),用于从二氧化碳和废水酸盐中可持续合成尿素. 催化剂实现了高效率和选择性,为传统方法提供了更绿色的替代方案.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 环境化学环境化学
背景情况:
- 传统的尿素合成是能源密集的.
- 在废水中有效地将稀释化物 (NO2-) 转化为尿素是具有挑战性的,因为中间减少问题.
- 开发可持续的C-N化合物合成方法至关重要.
研究的目的:
- 开发一种新型的电催化剂,有效地将二氧化碳 (CO2) 和稀释酸盐 (NO2-) 合成尿素.
- 研究金属/碳异质连接材料中电荷极化双位点在增强尿素合成中的作用.
- 为传统的能源密集型尿素生产工艺提供可持续的替代品.
主要方法:
- 一种金属/碳异质连接材料 (Cu@Fe-N-C) 的合成,该材料具有电荷极化Fe ((delta-) 和Cu ((delta+) 双位点.
- 在流电池中,二氧化碳和稀释NO2- (100ppm NO2- -N) 的电催化共降.
- 催化剂的活性位点和反应中间体的表征,包括*CO脱和NO2-减少到*NH2.
主要成果:
- Cu@Fe-N-C催化剂实现了高法拉第效率50.05%的尿素合成.
- 在 -0.35V (vs. RHE) 得到850.57毫克h-1g-1的高尿素产量.
- 实现了100%的尿素选择性和近单位的尿素和氨的选择性,即使在稀释的酸盐度.
结论:
- 开发的Cu@Fe-N-C催化剂通过电催化有效地从二氧化碳中合成尿素和通过电催化剂稀释酸盐.
- 带电极化的Fe-N-C和Cu位点在抑制CO脱吸和促进NO2-减少方面发挥着至关重要的作用.
- 这项工作为从废水资源中可持续合成C-N化合物提供了一个有希望的途径.
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