摘要
研究了Pt/ZSM-5双功能催化剂中金属-酸双活性中心距离对正己烷异构化反应的影响。通过调控金属Pt的落位,分别得到了双活性中心原子级别接触的Pt-ZSM-5/Al_(2)O_(3)和双活性中心纳米级别接触的Pt-Al_(2)O_(3)/ZSM-5两个样品。采用X射线衍射(XRD)、氮气等温物理吸脱附和氨气程序升温脱附(NH_(3)-TPD)等技术对样品的物化性质进行了表征,并考察了不同反应温度下两个催化剂催化正己烷异构化反应性能。结果显示,在异构化反应中,相比于原子级别接触的Pt-ZSM-5/Al_(2)O_(3),纳米级别接触的Pt-Al_(2)O_(3)/ZSM-5催化剂展现出更高的正己烷转化率和异构体产物选择性,并且在60 h寿命测试过程中未有明显失活。
This study focused on the effects of metal-acid intimacy on the hydroisomerization of n-hexane over Pt/ZSM-5.The intimacy between Pt active sits and acid sites of ZSM-5 was varied by locating the Pt metal sites either in the zeolite or on the Al_(2)O_(3).The physicochemical properties of the samples were characterized by X-Ray diffraction(XRD),N_(2) physisorption and NH_(3) temperature-programmed desorption(NH_(3)-TPD).The performance of the n-hexane hydroisomerization over the above catalysts was also investigated at different reaction temperature.Compared with Pt-ZSM-5/Al_(2)O_(3),Pt-Al_(2)O_(3)/ZSM-5 with nanoscale intimacy between Pt active sits and acid sites exhibited higher n-hexane conversion and higher selectivity of C_(6) isomers in products.Pt-Al_(2)O_(3)/ZSM-5 delivered stable performance,with no obvious deactivation observed during a 60-hour test.
作者
郝建旗
周健
滕加伟
王仰东
谢在库
HAO Jianqi;ZHOU Jian;TENG Jiawei;WANG Yangdong;XIE Zaiku(Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China;China Petrochemical Corporation,Beijing 100728,China)
出处
《化学反应工程与工艺》
CAS
2022年第4期310-317,共8页
Chemical Reaction Engineering and Technology
基金
博士后科学基金(2021M693507)。
