Improving the Hydrothermal Stability of ZSM-5 Zeolites in 1-Octene Aromatization by Sequential Alkali Treatment and Phosphorus Modification

For the aromatization of olefins (in Fischer–Tropsch synthetic oil), especially for fluidized bed reaction with steam as medium, improving catalytic and hydrothermal stabilities ZSM-5 catalysts is a research focus because both fundamental interests potential commercial applications. In this work, sequential alkali treatment phosphorus modification were carried out samples. The results obtained from characterization evaluation show that introduction mesopores facilitates dispersion species into pores improves stability 1-octene aromatization. After treatment, P-0.5A-Z5-ST sample treated an appropriate concentration retains most acid sites shows highest aromatic selectivity (22.5%) at TOS = 660 min. Therefore, moderate distribution in zeolite plays important role diffusions reactants products, well species.