Dehydrogenation of n-dodecane to linear mono-dodecene by traditional Pt-Sn/γ-Al₂O₃ catalyst suffers from low linear mono-dodecene selectivity and catalyst instability due to the surface acidity of γ-Al₂O₃. In this work, we used Fe-silicalite-1, ZSM-5 and silicalite-1 as supports to disperse Pt for catalyzing n-dodecane dehydrogenation. Various characterization of Pt/zeolite catalysts confirm that metallic Pt donating electrons to Fe³⁺ in Pt/Fe-silicalite-1 catalyst makes Pt nanoparticles anchored at the framework Fe site in the Fe-silicalite-1 zeolite, which leads to formation of well-dispersed and high stability of Pt nanoparticles. Meanwhile, the acidity of as-prepared catalysts follows the order of Pt/ZSM-5 > Pt/Fe-silicalite-1 > Pt/silicalite-1. The higher catalytic activity, higher linear mono-dodecene selectivity and superior stability of Pt/Fe-silicalite-1 catalyst compared to Pt/ZSM-5 and Pt/silicalite-1 catalysts for n-dodecane dehydrogenation is owing to well-dispersed and stable electron-deficient metallic Pt anchored at the Fe site in Fe-silicalite-1 zeolite framework and moderate acidity of Fe-silicalite-1.

通过传统的Pt-Sn系/γ-Al系正十二烷至直链单十二碳烯的脱氢₂ ö ₃从低直链单十二碳烯的选择性和催化剂的不稳定性，由于γ-Al的表面酸性催化剂患有₂ ö ₃。在这项工作中，我们使用Fe-silicalite-1，ZSM-5和silicalite-1作为载体分散Pt，以催化正十二烷脱氢。Pt /沸石催化剂的各种表征证实，金属Pt给电子提供了Fe ³⁺在Pt / Fe-silicalite-1催化剂中，Pt纳米粒子锚固在Fe-silicalite-1沸石的骨架Fe部位，从而导致Pt纳米粒子的分散性好和稳定性高。同时，所制备的催化剂的酸度遵循Pt / ZSM-5> Pt / Fe-硅沸石-1> Pt /硅沸石-1的顺序。与Pt / ZSM-5和Pt / silicalite-1催化剂相比，Pt / Fe-silicalite-1催化剂具有较高的催化活性，较高的线性单十二碳烯选择性和优异的稳定性，这是由于其分散性良好且稳定固定在Fe-silicalite-1沸石骨架中的Fe部位的缺电子金属Pt和Fe-silicalite-1的中等酸度。