Iron-containing MCM-41 catalysts for Baeyer–Villiger oxidation of ketones using molecular oxygen and benzaldehyde

摘要: Abstract Iron(III)-containing mesoporous silica (MCM-41) with Fe contents up to 1.8 wt% have been prepared by direct hydrothermal synthesis (DHT) and template ion exchange (TIE) methods. Characterizations of these catalysts done XRD, XPS, diffuse reflectance UV–vis, ESR, Mossbauer, XAFS spectroscopies. species in MCM-41 materials are tetrahedrally coordinated for the DHT method 1.1 wt% while those mainly octahedrally TIE method. Among catalysts, ferrisilicate 2 O 3 /Cab-O-Sil as references, Fe-MCM-41-DHT exhibited highest catalytic activity Baeyer–Villiger (B–V) oxidation ketones using molecular oxygen benzaldehyde. The prominent performance could be ascribed both 3+ incorporated inside framework its uniform nano-order mesopores allowing access bulky compounds active sites. Furthermore, this heterogeneous catalyst was reusable without any appreciable loss selectivity. It has confirmed IR spectroscopy that Fe-MCM-41-DHT-catalyzed B–V reaction proceeded via coordination carbonyl groups ketone .