Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 12, Issue 3, Pages 2661-2667Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2012.5783
Keywords
Carbon Nanotubes; Synthesis; Temperature Programmed CVD; Molybdenum; Catalysts
Categories
Funding
- Brazilian Agency CNPq
- Brazilian Agency FAPEMIG
- CAPES
- AEB
- Brazilian Institute of Nanotechnology
- Brazilian Network on Carbon Nanotube Research
- Microscopy Center of UFMG
- LNLS - Brazilian Synchrotron Light Laboratory/MCT
Ask authors/readers for more resources
In this work, it is demonstrated how a novel technique based on temperature-programmed chemical vapor deposition (TPCVD) can be used to investigate the synthesis of carbon nanotubes (CNTs) from methane on a classic catalyst FeMox/MgO (x = 0.07, 0.35 and 1.00). TPCVD monitors carbon deposition by measuring H-2 formed during CH4 decomposition and affords information on the different catalytic species, deactivation process, reaction kinetics and carbon yields. The obtained results showed for FeMgO catalyst a simple TPCVD peak related to the production of carbon beginning at 760 degrees C with maximum at 800 degrees C followed by a rapid deactivation resulting in a low carbon yield. The addition of Mo to Fe/MgO catalyst completely changes the TPCVD profile with the formation of a new catalytic species active at temperatures higher than 900 degrees C, which is stable and continuously decomposes CH4 to produce high carbon yields. Raman, TG/DTG, Mossbauer, SEM, TEM, XRD and TPR analyses suggested that this active catalytic phase is likely related to Fe-Mo and Fe-Mo-C phases active to produce single wall and mainly multiwall carbon nanotubes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available