Ethanol Catalytic Cracking Of Carbon Nanotubes And The Graphite Composite Electrode Materials, And Collaborative Production Of Hydrogen

A series of Co/C, Fe/C, Ni/C, Mo-Co/C, Mo-Ni/C and Mo-Fe/C were prepared by impregnation. Hydrogen, carbon nanotubes and CNTs/C composite electrode materials were produced by chemical vapor decomposition (CVD) from ethanol decomposition. The quality of carbon nanotubes was investigated systematically by means of SEM, Raman, XRDand TEM. The hydrogen yield and selectivity of various gas products were detected by GC. The galvanostatic charge-discharge of CNTs-graphite composite (CNTs/C) were carried out using a coin-type test by LAND Battery Test System.The effects of reaction temperature, catalyst type and the loading amount of catalysts on hydrogen yield, selectivity of various gas products, ethanol conversion and the quality of MWCNTs were discussed. The growth mechanism of MWCNTs over the different catalysts and the mechanism of Mo were proposed preliminarily by TEM.The results indicate:As for the Co/C and Mo-Co/C catalysts, at 500℃, the Co(5 wt%)/C was the optimal, e.g., H2 yield, the selectivity of hydrogen and ethanol conversion were 88%, 85% and 93% respectively; at 600℃, for the optimum catalyst Mo-Co(5 wt%, Mo:Co= 1:9)/C, H2 yield, the selectivity of hydrogen and ethanol conversion were 83%,80% and 82 % respectively. As for Ni/C and Mo-Ni/C catalysts, at 500℃, the Ni(8 wt%)/C and Mo-Ni(5 wt%,Mo:Ni=2:8)/C catalysts were the most effective, e.g., H2 yield (77% and 85%), the selectivity of hydrogen (74% and 78%) and ethanol conversion (85% and 88%) were obtained. As for Fe/C and Mo-Fe/C catalysts, at 600℃,the Fe(5 wt%)/C and Mo-Fe(5 wt%, Mo:Fe=1:9)/C catalysts were the best, e.g., H2 yield (75% and 80%), the selectivity of hydrogen (71% and 78%) and ethanol conversion (70% and 80%) were gotten. According to the characterization of TEM, the growth mechanism of MWCNTs was tip-growth mode over the Mo-Co/C and Mo-Fe/C and was both tip-growth and base-growth mode over the Mo-Ni/C.The first charge-discharge of the supported of graphite was 281 and 273 mAg-1. The reversible capacity kept 265 mAg-1 after 10 cycle. The CNTs/C composites from ethanol decomposition over the Co(Fe, Ni)/C catalysts as anode material in lithium ion battery were tested. The results indicate that CNTs(Mo-Co)/C composites material formed over Mo-Co(5 wt%, Mo:Co=1:9)/C at 500℃was optimal one. E.g., first charge-discharge capacity was 397 and 337 mAg-1 and the reversible capacity and coulomb efficiency kept 315 mAg-1 and 98% respectively after 10 cycles.