含有原子分散Pr3+与Ni/CeO2的双活性位点催化剂用于CO2化成甲
Neha Choudhary1, Navdeep Srivastava2, Harshini V Annadata3
1Institut Jean Le Rond D'Alembert, Sorbonne Université, CNRS UMR 7190, 2 Place de la Gare de Ceinture, Saint-Cyr-L'Ecole, 78210, France.
在Ni/CeO2催化剂上孤立的Pr3+原子显著增加CO2甲化,达到87%的转化率和100%的CH4选择性. 这种原子分散策略增强了催化活性和稳定性,以实现高效的二氧化碳化.
科学领域:
- 催化科学与工程 催化科学与工程
- 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:
- 二氧化碳的甲化是将二氧化碳转化为有价值的甲的关键过程.
- 开发高活性和选择性催化剂对于高效的二氧化碳利用至关重要.
- 活性成分的分散状态显著影响催化剂性能.
研究的目的:
- 设计和合成一种新型的Ni/CeO2催化剂,使用均分散的Pr3+来增强CO2甲化.
- 为了研究原子尺度分散Pr3+在Ni/CeO2.2.上的结构-活性关系.
- 阐明 Pr3+ 兴奋剂和氧空缺在提高催化性能方面的作用.
主要方法:
- 合成Ni-Pr/CeO2催化剂与原子规模的Pr3+分散.
- 使用PXRD,XAS,XPS,STEM-EDS,H2-TPR和CO2-TPD进行表征.
- 对300°C的二氧化碳甲化催化活性和选择性的评估.
主要成果:
- Ni-Pr/CeO2催化剂实现了87%的二氧化碳转化和~100%的CH4选择性.
- 结构分析证实 Pr3+ 融入 CeO2 格子,造成缺陷并增加氧气空缺.
- Pr3+ 剂增强了催化剂的可还原性和增加了表面基本性,与传统催化剂相比,导致了更高的性能.
结论:
- Pr3+对Ni/CeO2的均原子分散对CO2甲化非常有效.
- 增加的氧气空缺和增强的基本性是改善催化活性的关键因素.
- 开发的催化剂表现出卓越的稳定性和可回收性,为二氧化碳转化提供了一个有前途的途径.
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