在Core合金中调节Co-Re对,以在温和条件下进行高效的NH3合成.
Kailin Su1, Zhiyuan Zheng1, Dongya Huang1
1National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou, Fujian 350002, China.
ACS applied materials & interfaces
|July 31, 2025
概括
开发用于氨合成的非贵金属催化剂至关重要. - (CoRe) 合金表现有前途,由于协同的Co-Re配对站点,CoRe1实现了高氨合成率.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 高效的氨 (NH3) 合成对农业和工业至关重要.
- 非贵金属 (NPM) 催化剂被寻求作为传统贵金属的替代品.
- 单金属催化剂在N2激活和NH3脱吸方面面临着挑战.
研究的目的:
- 开发先进的NPM催化剂,以在温和条件下高效合成氨.
- 为了研究- (CoRe) 合金组成对催化性能的影响.
- 了解氨合成的CoRe催化剂中的结构-活性关系.
主要方法:
- 系统地制造具有不同Co/Re比率的CoRe_x合金催化剂 (x = 0.25,0.5,0.75,1,1.5,2).
- 在特定的温度和压力条件下对氨合成的催化活性进行评估.
- 分析Co-Re配对位点与催化性能之间的相关性.
主要成果:
- Co/Re比率极大地影响了Co/Re配对站点的形成.
- 与CoRe1一起观察到最佳的NH3合成速率,这归因于丰富的Co-Re对.
- 合金中过量的Co或Re会对N2激活或NH3脱吸产生负面影响.
- 在400°C和1MPa时,CoRe1表现出12.0 mmolgcat-1h-1的高氨合成率.
结论:
- 合金催化剂,特别是合金1,显示出有效合成氨的巨大潜力.
- 在CoRe1中,Co-Re轨道杂交的协同效应促进了N2激活和NH3脱吸.
- 优化CoRe合金的性能优于之前报告的许多用于氨基合成的NPM催化剂.
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