直馏汽油在纳米ZSM-5上的异构化反应研究

摘要

在固定床反应器中研究了不同反应条件下纳米HZSM-5和微米HZSM-5在直馏汽油异构化反应中的催化性能,并对纳米HZSM-5和微米HZSM-5进行了XRD、NH3-TPD及低温N2吸附等表征.结果表明:纳米HZSM-5粒径小、外表面酸量丰富、扩散路径短,直馏汽油异构化反应性能优于微米HZSM-5,具体表现在环烷烃和芳烃的生成量大.由于纳米颗粒之间的二次孔可以大量容纳积炭,纳米HZSM-5的稳定性好；当反应温度为320～360℃、质量空速为1 h-1时,纳米HZSM-5的催化性能最佳.%This paper introduces the performance of nanosized HZSM-5 and micronsized HZSM-5 in straight-run gasoline isomerization in a fixed bed under reaction conditions.The characterization of two molecular sieves were conducted by XRD,NH3-TPD and BET analysis.It is found that the nanosized HZSM-5 is more suitable for catalytic isomerization of straight-run gasoline than micronsized HZSM-5.This is because nanosized HZSM-5 has more external acid sites which favor the cyclization of paraffin and riches in secondary pores allowing more coke deposition.At 320-360 ℃ and WHSV of 1 h-1,nanosized HZSM-5 shows the best catalytic performance.Nanosized HZSM-5 can be used as an efficient catalyst for straight-run gasoline isomerization.