Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: S. Lim, D. Ciuparu, Y. Yangc, G. Du, L.D. Pfefferle, G.L. Haller
Editorial: Microporous and Mesoporous Materials, 101, p.200-206, 2007.
Transition metal incorporated MCM-41 materials were synthesized by careful control of multiple factors affecting the final product quality. Among them, the pH adjustment of the initial synthesis solution of Co-MCM-41 was crucial for the distribution of metallic ions in the silica framework. Higher pH significantly improved the physical structure of Co-MCM-41 and is accompanied by higher porosity. Each pore of Co-MCM-41, at the optimum pH, exhibited a hexagonal pore shaped entrance, not just the usual hexagonal array of pores of approximate circular shape. A mild acid treatment of Co-MCM-41 was a useful technique to remove surface metal oxide, which causes lowering of reduction stability by hydrogen spillover on the surface.
Cuvinte cheie: Co-MCM-41, TEM, XRD, Nitrogen physisorption, Pore shape, Acid treatment