Coupling and electronic synergistic effects of Fe/CeO2 composite to achieve high efficiency and selectivity for RWGS reaction
发布时间：2024-11-29
点击次数：
- 影响因子：
- 7.7
- DOI码：
- 10.1016/j.jcou.2024.102728
- 所属单位：
- 环境与资源学院
- 教研室：
- 化学工程系
- 发表刊物：
- Journal of CO2 Utilization
- 关键字：
- Fe-O-Ce; Zero-valent iron; Synergistic effect; RWGS reaction
- 摘要：
- Transition metal iron, because of its high oxygen mobility, excellent thermal stability and low price, is often used in the study of RWGS reaction. However, the bottleneck problem of iron-based catalysts is the poor CO2 conversion rate. Herein, the Fe/CeO2 composite catalyst with Fe-O-Ce was successfully constructed, which has both high CO2 conversion and high CO selectivity for the low-temperature RWGS reaction. Furthermore, the influence of Fe0 contents is studied, and the result indicated that the CO2 conversion rate and CO selectivity are up to 50.05% and 100% at 500 ºC by the use of 20Fe/CeO2. Moreover, CeO2 is the best catalyst holder than the others. The physical and chemical properties of the catalysts are investigated by in-situ XPS, XRD, low-temperature N2 absorption-desorption (BET) and CO2-TPD. Nano zero-valent iron (Fe0) is the main active center for the RWGS reaction, which easily releases the outer electrons to activate reactant molecules. The introduction of the CeO2 is conducive to the high dispersion of Fe0 nanoparticles and the formation of abundant active centers. With the increase of Fe loading, the electron-rich Fe0 induces a strong electronic effect on the electron-deficient CeO2. The regularity of catalyst are changed by a large amount of zero-valent iron entering into the CeO2 lattice, then formed a lot of Fe-O-Ce solid solution. A large amount of zero-valent iron enter into the CeO2 lattice, inhibiting the grain growth and aggregation of monometallic species, and promoting nano Fe species highly dispersed on CeO2 carriers, leading more active centers exposure. Meanwhile, the abundant oxygen vacancy on xFe/CeO2 surface is advantage for the adsorption and activation of H2 and CO2 molecules. Therefore, the coupling and electronic synergistic effects of the active component Fe0 and the carrier CeO2 make xFe/CeO2 becoming a promising candidate catalyst for RWGS reaction.
- 第一作者：
- Zhenqiong Gou
- 合写作者：
- Tao Wang,Qin Peng
- 论文类型：
- 源刊论文
- 通讯作者：
- Chuan Huang,Guilin Zhou
- 学科门类：
- 工学
- 文献类型：
- Journal Article
- 卷号：
- 81
- 页面范围：
- 102728
- 是否译文：
- 否
- 发表时间：
- 2024-03-01
- 收录刊物：
- SCI