Abstract
Fe-MFI zeolites are very promising materials for the oxidehydration of glycerol. This work shows that preparation procedure influences product selectivity. Hydrothermal synthesis is more selective to acrylic acid thanks to the Fe(+III) tetrahedral species in framework position. Conversely, post-synthesis treatment in a fluoride medium generates Fe(+II) Ox clusters in extra-framework position that increases acrolein selectivity. The reduction of the crystalline size of iron MFI to a nanoscale leads to a highly active, selective and stable catalyst with a stabilized glycerol (40 wt% in water) conversion of 90% and acrolein selectivity of 87%.
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