ZSM-5 is active in n-hexane cracking to light alkenes, but with the disadvantage of fast deactivation. A long lifetime ZSM-5 with high activity and anti-carbon deposition performance was of great concern for industrial application. The hierarchical ZSM-5 zeolites (xHF-ZSM5) were obtained by chemical etching with fluoride ions and characterized by XRD, FTIR, NH₃-TPD, SEM, TEM, N₂ adsorption-desorption. They showed higher BET surface area, larger mesoporous volume, less defect zones, commensurable microporous structure and acid property compared with that of the parent ZSM-5. The defects were dissolved resulting in higher crystallinity zeolite. They showed better catalytic performance with less carbon deposition in catalytic cracking of n-hexane due to superior channel structure, large mesoporous and macroporous structure. In order to reduce the amount of carbon deposition further, 0.5HF-ZSM5 was selected and made phosphorus modification. After phosphorus modification, the catalytic activity and stability was maintained at a high level, and the carbon deposition of n-hexane cracking was restrained due to the gradual decreasing of acid amount with the increase of phosphorus content. The amount of carbon deposition decreased and reached the minimum of 23 mg g⁻¹ for 0.5HF-ZSM5-1P, which was four times less than that of the parent ZSM-5.

ZSM-5是在有源Ñ正己烷裂化轻烯烃，但是具有更快的失活的缺点。具有高活性和抗碳沉积性能的长寿命ZSM-5是工业应用中非常关注的问题。通过用氟离子化学刻蚀获得分级的ZSM-5沸石（xHF-ZSM5），并通过XRD，FTIR，NH ₃ -TPD，SEM，TEM，N ₂吸附-脱附进行表征。与母体ZSM-5相比，它们显示出更高的BET表面积，更大的中孔体积，更少的缺陷区，相当的微孔结构和酸性质。缺陷被溶解，导致结晶度更高的沸石。它们在n的催化裂化中表现出更好的催化性能和更少的碳沉积正己烷由于具有优越的通道结构，大的中孔和大孔结构。为了进一步减少碳沉积量，选择了0.5HF-ZSM5并进行了磷改性。磷改性后，将催化活性和稳定性维持在一个高的水平，和中的碳沉积Ñ己烷裂化抑制由于逐渐与磷含量的增加降低酸量。对于0.5HF-ZSM5-1P，碳沉积量减少并达到最低23 mg g ^-1，这是母体ZSM-5的四倍。