Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: Y. Chen, D. Ciuparu, Y. Yang, S. Lim, C. Wang, G. L Haller, L. D Pfefferle
Editorial: Nanotechnology, 16(7), p.S476-S483, 2005.
Both Ni- and Co-MCM-41 may be used for the synthesis of single-wall carbon nanotubes (SWNT). We present a comparative investigation that demonstrates that smaller diameter SWNT with a narrower distribution of diameters are produced using Co-MCM-41. Temperature-programmed reduction and x-ray absorption spectroscopy were used to measure the reducibility and metal cluster growth of Ni- and Co-MCM-41 in He, H2 and under CO disproportionation reaction. The differences between these two catalysts can be attributed to a greater reducibility of and a greater CO affinity for Ni relative to Co.
Cuvinte cheie: Ni-MCM-41, carbon nanotubes, CO disproportionation, X-ray Absorption Spectroscopy