采用超临界干燥法制备了活性高、比表面大的Fe/Mo/Al2O3催化剂.通过超临界干燥,催化剂的比表面由294m2/g提高到401m2/g.在1000℃下用该催化剂催化裂解甲烷, 合成了大产量、高质量的单壁纳米碳管(SWNTs).利用SEM、TEM、HRTEM、TGA 和Raman等手段对所制备的SWNTs进行了表征.结果表明:超临界法制备催化剂合成的粗产品中SWNTs含量在30%以上,大大高于同一配方催化剂采用常规干燥法的产率(约2%); SWNTs的管径分布在0.8-1.0nm之间,其形态以束状为主.
The highly active Fe/Mo/Al2O3 catalyst with the large specific surface area was prepared by the supercritical drying method. The BET specific surface area of the as-prepared catalyst was increased from 294m2/g to 401m2/g. High quality single-walled carbon nanotubes (SWNTs) were synthesized by catalytic decomposition of CH4/H2 at 1000℃ using the catalyst. SEM, TEM, HRTEM, TGA and Raman spectroscopy were used to characterize the SWNTs. The content of SWNTs in the product propared is over 30wt%, which is much higher than that by using the conventional drying method, i.e. 2wt%. The mean diameter of the as-prepared SWNTs is in 0.8-1.0nm and they are usually bundles.
参考文献
| [1] | Iijima S, Ichihashi T. Nature, 1993, 363 (6430): 603-605. [2] Salvetat J P, Briggs G A D, Bonard J M, et al. Phys. Rev. Lett., 1999, 82 (5): 944-947. [3] de Pablo P J, Martinez M T, Colchero J, et al. Mat. Sci. Eng. C, 2001, 15 (1-2): 149-151. [4] Dillon A C, Jones K M, Bekkedahi T A, et al. Nature, 1997, 386 (6623): 377-379. [5] Stanisalus S W, Emesto J, Adam T W, et al. Nature, 1998, 394 (6688): 52-55. [6] Yahachi S, Sashiro U. Carbon, 2000, 38 (2): 169-182. [7] Kong J, Franklin N R, Zhou C W, et al. Science, 2000, 287 (5453): 622-625. [8] 钟蓉, 丛洪涛, 成会明, 等. 材料研究学报, 2002, 16 (4): 344-348. [9] Journet C, Maser W K, Berner P, et al. Nature, 1997, 388 (6644): 756-758 [10] Thess A, Lee R, Nikolaev P, et al. Science, 1996, 273 (5274): 483-487. [11] Dai H J, Rinzler A G, Nikalaev P. Chem. Phys. Lett., 1996, 260 (3-4): 471-475. [12] Hafner J H, Bronikowski M J, Azamian B R, et al. Chem. Phys. Lett., 1998, 296 (1-2): 195-202. [13] Kong J, Cassell A M, Dai H J. Chem. Phys. Lett., 1998, 292 (4-6): 567-574. [14] Cassell A M, Raymakers J A, Kong J. J. Phys. Chem., B, 1999, 103 (31): 6484-6492. [15] Li Q W, Hao Y, Li X H, et al. Chem. Mater, 2002, 14 (10): 4262-4266. [16] Heley J R, Jackson D, James P F. Journal of Non-Crystalline Solids, 1995, 186: 30-36. [17] Novak Z, Knez Z, Drofenik M, et al. Journal of Non-Crystalline Solids[J], 2001, 285: 44-49. [18] Kitiyanan B, Alvarez W E, Harwell J H, et al. Chem. Phys. Lett., 2000, 317 (3-5): 497-503. [19] Ruoff R S, Tersoff J, Lorents D C, et al. Nature, 1993, 364 (6437): 514-516. [20] Rao A M, Richter E, Bandow S, et al. Science, 1997, 275 (5297): 187-191. [21] Alvarez L, Righi A, Guillard T, et al. Chem. Phys. Lett., 2000, 316 (3-4): 186-190. [22] 相宏伟, 钟炳, 彭少逸, 等. 材料科学与工程, 1995, 13 (2): 38-42. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%