Abstract
Carbon nanotubes (CNTs) were prepared by chemical vapor catalytic deposition using the Fe-Ni-Mo/MgO catalyst prepared by sol-gel. The effect of the dosage of citric acid on the activity of Fe-Ni-Mo/MgO catalyst for CNT synthesis was studied. The results showed that the dosage of citric acid greatly affected the activity of Fe-Ni-Mo/MgO catalyst. The CNTs had a high yield about 7000 % (1 hr) at a 0.2:1 ˜0.3:1 molar ratio of citric acid and metal ions. When the molar ratio of citric acid to metal ions is 0.1:1, 0.15:1, 0.4:1, and 0.6:1, the catalyst activity dropped sharply or lost its activity rapidly. The X-ray diffraction and nitrogen adsorption–desorption isotherms were used to characterize crystal structures and specific surface area of the catalysts with different citric acid dosage, respectively. It was revealed that both crystallization degree and specific surface area of the catalyst jointly affected the catalyst activity. Lower crystallization degree and larger specific area were to maintain a highly active Fe-Ni-Mo/MgO catalyst for CNT synthesis.
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