Synthesis of carbon nanotubes using mesoporous Fe-MCM-41 catalysts.
MWNTs (multi-walled carbon nanotubes) were made by catalytic CVD process using iron-containing mesoporous silica, Fe-MCM-41, with 4 mol% Fe loading prepared by direct synthesis route. Uniform 5 nm size Fe2O3 nano-particles impregnated onto a mesoporous silica support, SBA-15 were also prepared for CNTs synthesis. The catalysts were characterized using XRD, SEM/TEM, N2 physisorption, UV-vis diffuse reflectance and FT-IR spectroscopies. Acetylene gas was introduced as a carbon source, and the gas mixture of Ar:H2:C2H2 = 14:5:1 pyrolyzed at 750 degrees C for 60 min was found to be the optimum synthesis condition. Fe-MCM-41 due to higher dispersion of nano-sized Fe-species was efficient as catalyst for MWNTs with more uniform size distribution. Cobalt-impregnated Fe-MCM-41 (Co/Fe = 1) produced a small fraction of SWNTs of ca. 2 nm diameter mixed with MWNTs.
Ko
Jeong-Rae
JR
Department of Chemical Engineering, Inha university, Incheon, 402-751, Korea.
Ahn
Wha-Seung
WS
D000114:Acetylene / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D003460:Crystallization; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
D037742:Nanotubes, Carbon; D003035:Cobalt; D012822:Silicon Dioxide; D007501:Iron; D000114:Acetylene