期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 284, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119702
关键词
Fischer-Tropsch synthesis; Iron nitrides; Iron carbides; Structure-reactivity relationship; Mossbauer spectra
资金
- Excellent Young Scientists Fund from NSFC [21622106]
- National Science Foundation of China (NSFC) [21771117, 21331001, 21773288, 11574281]
- Outstanding Scholar Fund from the Science Foundation of Shandong Province of China [JQ201703]
- Doctoral Fund from the Science Foundation of Shandong Province of China [ZR2018BB010]
- Taishan Scholar project of Shandong Province of China
The study successfully synthesized phase-pure Fe2N nanoparticles on Al2O3, achieving effective phase transformation to Fe2C and demonstrating high catalytic activity and selectivity.
Fischer-Tropsch synthesis (FTS) targeting liquid fuel products is key technology to alleviate the excessive dependence on unsustainable crude oil. Fabrication of highly active phase has long been an attractive topic in the field of Fischer-Tropsch catalysis. However, as a promising active species, the efficient formation of Fe2C phase is inhibited by kinetic barrier via traditional approaches. In this context, we firstly synthesized phase-pure Fe2N nanoparticles on Al2O3, which has similar coordination structure with Fe2C. The in-situ XRD data in time series reveal that pre-existing of interstitial N atoms in Fe2N structure leads to the effective phase transformation to Fe2C at low temperatures (280 degrees C). The as-prepared catalysts demonstrated highly catalytic activity without any induction period, coupling with a high selectivity of 60wt.% for desired valuable products. In addition, the corresponding structural evolution uncover the determining effect of these electron-rich Fe sites in the Fe2X (N or C) structure on superior performance.
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