采用浸渍法制备了Ni/ZSM-5分子筛，利用X射线衍射、N₂吸附-脱附、NH₃-程序升温脱附等方法考察了Ni负载对催化剂晶相、孔结构和酸性质的影响，并用于催化正己烷裂解。结果表明，Ni负载降低了ZSM-5的比表面积、微孔孔容和原有中强酸酸量，当Ni质量分数 ≥ 0.6%时，分子筛出现新的强酸位且该处酸量随Ni质量分数的提高而增大。Ni对分子筛孔道和酸性的调控作用提高了轻质烯烃选择性。在反应温度为600℃、N₂为载气、V（N₂）：V（反应物）=9：1、正己烷质量空速为6 h^-1、Ni质量分数为2.0%时，C_2~4⁼的总选择性为56.07%，收率为40.22%，与未改性ZSM-5相比选择性提升了18.70%。

Ni/ZSM-5 catalysts are prepared by impregnation method,and used in n-hexane cracking.The crystal phase structure,pore structure and acidity of the catalysts are characterized by X-ray diffraction,N₂ adsorption-desorption,and NH₃-programmed temperature desorption,in order to explore the influences of Ni modification on ZSM-5.Results suggest that specific surface area,micropore volume,and the amount of medium-strong acid site of ZSM-5 are reduced due to the addition of Ni.As the content of Ni exceeds 0.6 wt.%,new strong acid sites appear and new acid content increases with Ni loading amount.Modification on pore volume and acidity of ZSM-5 by Ni improves the selectivity of light olefins in the catalytic cracking of n-hexane.Total selectivity and yield of C_2~4⁼ can reach 56.07% and 40.22%,respectively when Ni loading amount is 2.0 wt.%,the temperature remains at 600℃,nitrogen is used as carrier gas,and the volume ratio of nitrogen to n-hexane is 9:1,and the mass space velocity of n-hexane is 6 h^-1.Total selectivity is 18.70% higher than that over unmodified ZSM-5.

陈雪琴(1993-),女,硕士研究生,研究方向为烷烃催化裂解制烯烃,18721322771@163.com