Synergistic Effects of Hierarchically Interconnected Porous Structure and Fe Modification on Zeolite ZSM-5 for Efficient Benzyl Alcohol Alkylation
Constructing hierarchically porous structures and embedding metal species into zeolite frameworks can effectively enable fast diffusion and synergistic catalysis.We report a one-step synthesis method to synthesize hierarchically macro-meso-microporous zeolite ZSM-5 single crystals containing Fe metal nanoclusters,that has advantages compared to multistep methods such as impregnation and ion exchange.Zeolite ZSM-5-Fe catalysts were prepared by steam assisted crystallization with addition of hierarchically porous carbon template and a Fe precursor.The catalyst was systematically characterized by means of X-ray diffraction(XRD),ultraviolet-visible spectroscopy indicated that the isolated Fe(Ⅲ)located at ion exchange sites and ferrite octahedron(six-coordinate)were the main redox-active centers.At a loading amount(mass fraction)of 1%,the highest benzyl alcohol conversion rate reached 59.3%,with a product selectivity of 83.2%,and a final yield of 49.3%.The catalyst maintained high catalytic activity even after five cycles,demonstrating its remarkable stability.
ZSM-5 zeoliteHierarchical structureTransition metal FeAromatic alkylation
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