期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 50, 页码 43578-43587出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11820
关键词
Fischer-Tropsch synthesis; linear alpha-olefins; Fe3O4@MnO2; C-C coupling; syngas
资金
- International Cooperation and Exchange Program of the National Natural Science Foundation of China [51861145102]
- International Science and Technology cooperation project of Xinjiang Production and Construction Corps [2017BC008]
- Fundamental Research Fund for the Central Universities [2042017kf0173]
Converting syngas to value-added chemicals via Fischer-Tropsch synthesis has attracted much attention, whereas the direct hydrogenation of CO to heavy olefins, especially linear alpha-olefins (LAOs), remains a challenge. In this study, we designed a core-shell Fe3O4@MnO2 catalyst to realize the direct conversion of syngas to LAOs with high efficiency. This catalyst exhibited a high selectivity of 79.60% for total alkenes and 64.95% for C-4(+) alkenes, 91% of which are LAOS, at a CO conversion of approximately 75%. Promotion of the electron transfer from MnO2 to Fe3O4 inside the core-shell Fe3O4@MnO2 catalyst facilitated the dissociative adsorption of CO molecules on Fe3O4 and the spillover of H atoms onto the MnO2, which enhanced C-C coupling, weakened the hydrogenation activity of the catalyst, and improved the production of LAOS. A superior stability over 100 h was observed, demonstrating the promising potential of this catalyst for industrial applications.
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