支持的单原子催化剂用于二氧化碳的甲化
Carly Byron1, Yu Lim Kim1, Jacob T Bryant1
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
高度分散的单个原子,由在上促进,在二氧化碳甲化中表现出色. 这种双金属催化剂具有高转换率和甲选择性,证明了高效的二氧化碳利用率.
科学领域:
- 不同质的催化剂.
- 材料科学 是一种材料科学.
- 化学工程是化学工程的组成部分.
背景情况:
- 开发有效的二氧化碳甲化催化剂对于碳利用和可持续能源至关重要.
- 双金属催化剂为增强催化活性和选择性提供协同效应.
- 了解金属支相互作用是设计高性能催化剂的关键.
研究的目的:
- 合成和评估一系列二金属基催化剂,用于二氧化碳甲化.
- 调查剂和支剂对催化剂性能的影响.
- 阐明最有前途的催化剂的结构-活动关系.
主要方法:
- 用于催化剂合成的有机金属接种.
- 高吞吐量流量反应器用于催化活性和选择性测试.
- 先进的表征技术包括HRTEM,XPS,XRD,H2-TPR,CO2-TPD和DFT计算.
主要成果:
- Ni/Co/CeO2催化剂在300°C时表现出高的二氧化碳转化 (84.3%) 和甲选择性 (99.6%).
- 鉴定结果显示,单个Ni和Co原子分散在体上,具有强烈的金属支相互作用和氧气空缺.
- 的兴奋剂增强了Ni和Ce的减少,表明单个阴离子Ni原子对甲化非常活跃.
结论:
- 有机金属接种是一种有效的方法,用于制备高度分散的双金属催化剂.
- 对于二氧化碳甲化,Ni/Co/CeO2催化剂表现出卓越的活性,选择性和耐用性.
- 增强的性能归因于Ni,Co和CeO2之间的协同电子效应,从而优化了活性位点.
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