Bifunctional Pt/Fe-ZSM-5 catalyst for xylene isomerization

• Published in: Journal of the Taiwan Institute of Chemical Engineers 2017-09, Vol.78, p.438-446
• Main Authors: Rasouli, Milad, Atashi, Hossein, Mohebbi-Kalhori, Davod, Yaghobi, Nakisa
• Format: Article
• Language: English
• Subjects: EB conversion; Pt impregnation; Xylene isomerization; Xylene loss; ZSM-5 zeolite
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2017.05.018

•Fe-ZSM-5 catalyst was synthesized by hydrothermal method.•Pt impregnation was conducted by new wet incipient impregnation on Fe-supported ZSM-5.•Reducing weak acidity led to lower coke formation and more catalytic stability in Fe-containing ZSM-5 catalysts.•(0.1wt%)Pt/(0.4wt%)Fe-ZSM-5 was known as an active and stable catalyst in xylene isomerization reactions. The addition of iron to the synthesis of ZSM-5 catalysts (Si/Al=21) was studied in xylene isomerization reactions. Pt impregnation was conducted by partial vacuum impregnation on both the parent and Fe-ZSM-5. XRD, FE-SEM, ICP, BET, XPS, FT-IR, NH3-TPD, and TG analysis have been used to characterize the catalysts. Fe incorporation strongly decreased the weak acid sites and slightly reduced the strong acid sites. Reducing weak acidity led to lower coke formation and more catalytic stability in Fe-containing ZSM-5 catalysts. The presence of Pt on the Fe-supported ZSM-5 illustrated simultaneous high PX yield and high catalyst stability. (0.1wt%)Pt/(0.4wt%)Fe-ZSM-5 as an efficient and stable catalyst for xylene isomerization reactions demonstrated high PX yield (25.4wt%), high EB conversion (61%) and low xylene loss (1.8%). [Display omitted]