水热处理和硅烷化对ZnO/HZSM-5催化直馏汽油芳构化性能的影响  

EFFECT OF HYDROTHERMAL TREATMENT AND SILYLATION ON THE AROMATIZATION OF STRAIGHT-RUN GASOLINE OVER ZnO/HZSM-5 CATALYST

作　　者：蔡博[1] 龙化云[1] 靳凤英[1] 郭新闻[1] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,辽宁大连116024

出　　处：《石油炼制与化工》2012年第12期23-28,共6页Petroleum Processing and Petrochemicals

摘　　要：对纳米HZSM-5分子筛进行水热处理并采用正硅酸乙酯对其改性后制备Si/HZSM-5催化剂,在此基础上采用硝酸锌等体积浸渍法改性制备Si-ZnO/HZSM-5催化剂。以直馏汽油为原料,考察水热处理温度以及硅烷化程度对ZnO/HZSM-5催化剂芳构化性能的影响。结果表明:随着水热处理温度的升高,芳构化稳定性先增加后降低,说明适宜的水热处理温度有利于催化剂在直馏汽油芳构化中保持良好的活性和稳定性。硅烷化可进一步改善催化剂的芳构化稳定性,降低催化剂积炭量,但当SiO2质量分数超过12%后,由于催化剂孔口缩小,导致催化剂芳构化性能明显下降。Nano-HZSM-5 samples were hydrothermally treated under various temperatures and modified by tetraethoxysilane （TEOS）, then a series of Si-ZnO/HZSM-5 catalysts were prepared by stepwise wet impregnation method using zinc nitrate. The effect of hydrothermal treating temperature and silylation on the aromatization of straight-run gasoline over ZnO/HZSM-5 catalyst was investigated. Test results showed that with the increase of hydrothermal treating temperature, the aromatization sta- bility of catalyst increased firstly followed by decrease, which indicated that suitable hydrothermal trea- ting temperature was helpful for catalyst having good activity and stability in the aromatization of straight-run gasoline. Silylation treatment could further improve the aromatization stability of catalyst and reduced the amount of coke deposited on catalyst. However, when the mass fraction of SiO2 on the catalyst was over 12G, a significant decrease of catalyst aromatization performance was observed due to the reduction of catalyst pore size.

关 键 词：直馏汽油 芳构化 纳米ZSM-5分子筛 水热处理 硅烷化 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]