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Enhanced Fischer-Tropsch synthesis performances of Fe/h-BN catalysts by Cu and Mn
- Source :
- Catalysis Today. 343:91-100
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- A series of Fe/h-BN catalysts promoted with Cu or Mn were prepared for Fischer-Tropsch synthesis (FTS). The physicochemical properties, crystal structures and morphologies of the catalysts were characterized by N2 physisorption, FT-IR, TPR, XPS, XRD, MES and TEM. It is found that iron oxide nanoparticles are highly dispersed on h-BN matrix due to the anchoring effect of surface defects and the accommodation of porous structures of h-BN. The characterization results indicate that strong interaction between iron oxide and h-BN is present on un-promoted catalyst, which endows the h-BN supported iron catalyst with stable properties under FTS conditions but severely retards reduction of the catalyst. The addition of Cu to Fe/h-BN can to some extent overcome the strong interaction by introducing more sites for dissociating H2. It is observed that Cu promoter can increase the reduction or carburization degree and thus enhance the FTS activity. The addition of Mn to Fe/h-BN can weaken the strong interaction by altering the electron structure of iron species. And the electron-rich Fe species are responsible for easy reduction and the enhanced FTS performance. Besides, a higher activity can be realized by co-adding Cu and Mn to the Fe/h-BN catalyst. These results suggest that the synergistic effect of Mn and Cu can largely improve the performance of Fe/h-BN catalyst without impairing the stability of the catalyst. The present study paves a way to tailor the performances of FTS catalysts with h-BN as support.
- Subjects :
- Materials science
Iron oxide
Fischer–Tropsch process
02 engineering and technology
General Chemistry
Crystal structure
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Catalysis
0104 chemical sciences
chemistry.chemical_compound
Physisorption
chemistry
X-ray photoelectron spectroscopy
Chemical engineering
0210 nano-technology
Porosity
Iron oxide nanoparticles
Subjects
Details
- ISSN :
- 09205861
- Volume :
- 343
- Database :
- OpenAIRE
- Journal :
- Catalysis Today
- Accession number :
- edsair.doi...........cf9128e9581555f167c482758c25ab7a