Abstract
The synthesis of Fe-SBA-16 with isolated framework Fe species was achieved by simple adjustment of molar ratio of co-surfactant n-butanol, TEOS, n(H2o)/n(HC)l, ratio, Si/Fe ratio, and aging condition, respectively. The extent of mesopore structural ordering and the coordination of iron are confirmed by X-ray diffraction, NZ physisorption, Si-29-MAS NMR, SEM, TEM, electron spin resonance (ESR), and NH3-TPD analysis. The material obtained constitutes micro- (similar to 316 m(2)/g) and mesopore surface area (similar to 1000 m(2)/g), with high-mesopore sizes (similar to 9.8 nm). The micropore volume present up to 0.28 cm(3)/g, while the total pore volume range similar to 0.90 cm(3)/g at the maximum. Among various Si/Fe ratios synthesized, Fe-SBA-16 with Si/Fe ratio 19 exhibited good catalytic activity for the oxidation of cyclohexene at the optimized reaction condition. (C) 2009 Elsevier Inc. All rights reserved.