| Autor: |
Li, Bolang, Wang, Fei, Li, Kai, Ning, Ping, Chen, Min, Zhang, Changbin |
| Zdroj: |
Journal of Rare Earths; 20230101, Issue: Preprints |
| Abstrakt: |
The chemical transformation of CO2produces carbon compounds that can be used as precursors for the production of chemicals and fuels. Here, we investigated the activity and selectivity of the transition metals (Fe, Co, and Ni) supported on CeO2catalyst for CO2hydrogenation at atmospheric pressure. We found that Ni/CeO2shows the highest CO2conversion compared with Fe/CeO2and Co/CeO2. Besides, Co/CeO2and Ni/CeO2exhibit nearly 100% CH4selectivity while Fe/CeO2inclines to produce CO. The characterization results show that the metal-support interaction order is Fe/CeO2 > Co/CeO2 > Ni/CeO2, the weak metal-support interaction over Ni/CeO2benefits the activation of H2and then promotes the activity of CO2hydrogenation. Additionally, in situDRIFTS results demonstrate that monodentate formate species rather than bidentate formate are the active intermediates. The main route of CO2hydrogenation to CH4is that CO2is firstly transformed to m-HCOO∗ and then direct hydrogenation of the m-HCOO∗ to CH4. This study provides insights into the understanding of the mechanisms of CO2hydrogenation on CeO2based catalysts. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full Text from ScienceDirect