等级孔结构协同 Fe 改性提升 ZSM-5 分子筛催化苯甲醇烷基化性能

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 （UV-Vis），H₂-temperature program reduction（H₂-TPR），and X-ray photoelectron spectroscopy（XPS）. The results 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.